Monitoring device and method of determining accuracy of pulse pressure variability

Abstract

The application discloses a kind of monitoring equipment and the accuracy of determining pulse pressure variation method, monitoring equipment is used to monitor the vital sign parameter of target object, comprising: signal acquisition circuit (102), for collecting the vital sign signal of target object;Processor (101) is used to process vital sign signal to obtain the vital sign parameter of target object;Processor (101) is further used to: the data of vital sign parameter is processed to obtain the pulse pressure variation of target object;Obtain the multiple associated parameters of target object indicating the accuracy of pulse pressure variation;Based on multiple associated parameters, determine the accuracy of pulse pressure variation, so as to reduce the possibility that user misjudges the physiological state of patient due to inaccurate pulse pressure variation.

Description

[0001] manual Technical Field

[0002] This invention relates generally to the field of medical device technology, and more specifically to a monitoring device and a method for determining the accuracy of pulse pressure variability. Background Technology

[0003] Fluid responsiveness refers to the ability of cardiac output (CO) to increase in response to a certain amount of fluid infusion within a short period. When a patient's preload is in the rising phase of the Frank-Starling curve, fluid resuscitation can significantly increase CO. For critically ill patients, fluid responsiveness is an extremely important aspect of hemodynamic assessment and forms the basis of fluid management.

[0004] In clinical practice, pulse pressure variation (PPV) can be used to assess a patient's fluid responsiveness and guide fluid management in mechanically ventilated patients. This is particularly important in the ICU, where most patients are mechanically ventilated and have invasive blood pressure (IBP) monitoring, making PPV readily available. Academic research has confirmed that PPV values ​​can indicate whether a patient is fluid-responsive.

[0005] It is important to note that using PPV to predict fluid responsiveness in mechanically ventilated patients has certain prerequisites; otherwise, the calculation results will be inaccurate. Currently, the presentation of PPV parameters does not indicate accuracy, and PPV values ​​measured under unsuitable conditions may mislead physicians' judgments of patient volume responsiveness, leading to incorrect clinical decisions and affecting the optimization of fluid management and patient hemodynamic status. Summary of the Invention

[0006] The present invention is proposed to solve at least one of the above-mentioned problems. Specifically, one aspect of the present invention provides a monitoring device, the monitoring device comprising:

[0007] Signal acquisition circuit, used to acquire vital signs signals of the target object;

[0008] A processor is configured to process the vital sign signals to obtain the vital sign parameters of the target object; the processor is further configured to:

[0009] The vital signs data are processed to obtain the pulse pressure variability of the target object;

[0010] Obtain multiple associated parameters of the target object that characterize the accuracy of the pulse pressure variability;

[0011] The accuracy of the pulse pressure variability is determined based on the aforementioned multiple correlation parameters.

[0012] In another aspect, the present invention provides a monitoring device for monitoring the vital signs parameters of a target object, comprising:

[0013] A signal acquisition circuit is used to acquire the vital signs signals of the target object;

[0014] A processor is configured to process the vital sign signals to obtain the vital sign parameters of the target object; the processor is further configured to:

[0015] The data of the vital signs parameters are processed to obtain monitoring parameters used to characterize the capacity responsiveness of the target object;

[0016] Obtain multiple associated parameters of the target object that characterize the accuracy of the monitoring parameters;

[0017] The accuracy of the monitoring parameters is determined based on the multiple associated parameters.

[0018] In another aspect, the present invention provides a monitoring device for monitoring the vital signs parameters of a target object, the monitoring device comprising:

[0019] A signal acquisition circuit is used to acquire the vital signs signals of the target object;

[0020] A processor is configured to process the vital sign signals to obtain the vital sign parameters of the target object; the processor is further configured to:

[0021] The data of the vital signs parameters are processed to obtain monitoring parameters used to characterize the capacity responsiveness of the target object;

[0022] Obtain the correlation features of the target object that characterize the accuracy of the monitoring parameters;

[0023] Based on the aforementioned correlation features, the accuracy of the monitoring parameters is determined.

[0024] This application also provides a method for determining the accuracy of pulse pressure variability, the method comprising: acquiring vital sign parameters of a target object; processing the data of the vital sign parameters to obtain the pulse pressure variability of the target object; acquiring multiple associated parameters of the target object characterizing the accuracy of the pulse pressure variability; and determining the accuracy of the pulse pressure variability based on the multiple associated parameters.

[0025] The monitoring device and method for determining the accuracy of pulse pressure variability (PPV) according to this application can determine the accuracy of PPV based on the multiple associated parameters, and feed the result of the accuracy of PPV to the user so that the user can promptly detect errors in the PPV value, thereby reducing the possibility of the user misjudging the patient's physiological state due to inaccurate PPV values. At the same time, it can also help clinicians to correct the causes of inaccurate PPV values ​​in a timely manner, thereby ensuring the accuracy of PPV parameter monitoring, so as to better assist doctors in managing the patient's fluids. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A schematic block diagram of a monitoring device according to one embodiment of the present invention is shown;

[0028] Figure 2 A schematic diagram of the display interface of a display according to one embodiment of the present invention is shown;

[0029] Figure 3 A flowchart illustrating a method for determining the accuracy of pulse pressure variability according to one embodiment of the present invention is shown. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the present invention more apparent, exemplary embodiments according to the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely a part of the embodiments of the present invention, and not all of the embodiments of the present invention. It should be understood that the present invention is not limited to the exemplary embodiments described herein. Based on the embodiments of the present invention described herein, all other embodiments obtained by those skilled in the art without inventive effort should fall within the protection scope of the present invention.

[0031] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0032] It should be understood that the invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0033] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “including,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0034] In view of the aforementioned problems with the monitoring equipment, this application provides a monitoring equipment for monitoring the vital signs parameters of a target object, comprising: a signal acquisition circuit for acquiring the vital signs signals of the target object; a processor for processing the vital signs signals to obtain the vital signs parameters of the target object; the processor is further configured to: process the data of the vital signs parameters to obtain the pulse pressure variability of the target object; acquire multiple correlation parameters of the target object characterizing the accuracy of the pulse pressure variability; and determine the accuracy of the pulse pressure variability based on the multiple correlation parameters.

[0035] The monitoring device and method for determining the accuracy of pulse pressure variability (PPV) according to this application can determine the accuracy of PPV based on multiple related parameters, and provide the results of the accuracy of PPV to the user. This allows the user to promptly detect errors in the PPV value, thereby reducing the possibility of the user misjudging the patient's physiological state due to inaccurate PPV values. At the same time, it can also help clinicians to correct the causes of inaccurate PPV values ​​in a timely manner, thereby ensuring the accuracy of PPV parameter monitoring and better assisting doctors in managing the patient's fluids.

[0036] To fully understand this invention, a detailed structure will be presented in the following description to illustrate the technical solution proposed by this invention. Optional embodiments of the invention are described in detail below; however, in addition to these detailed descriptions, the invention may have other embodiments. Specifically, the monitoring device of this application and the method for determining the accuracy of pulse pressure variability will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0037] As an example, the monitoring device in this application acquires the physiological parameters of the object connected to it. The monitoring device in this application can be a bedside monitor, a central station, a PC with monitoring software installed and running, etc. The monitoring device can also be a ventilator, a ward round machine, etc. The ventilator or ward round machine can obtain the necessary parameter information from the monitor or other information systems to determine the accuracy of PPV. The following embodiments mainly use a bedside monitor as an example to illustrate this application.

[0038] The monitoring device 100 may include one or more processors 101, one or more sensors 102, a display 103, a memory 104, and a communication interface, etc. These components are interconnected via a bus system and / or other forms of connection mechanisms (not shown). It should be noted that... Figure 1 The components and structure of the monitoring device 100 shown are merely exemplary and not limiting; the monitoring device 100 may also have other components and structures as needed.

[0039] The monitoring device 100 has a separate housing with a sensor interface area on its panel, integrating multiple sensor interfaces for connection to various external physiological parameter sensor accessories (not shown). The sensors are used to detect the physiological parameters (also referred to herein as vital signs parameters) of the object to which the monitoring device is connected (i.e., the target object). These physiological parameters include at least one of the following: blood pressure, respiratory rate, heart rate, body temperature, pulse rate, blood oxygen saturation, cardiac output, end-tidal carbon dioxide, electroencephalogram (EEG), electrocardiogram (ECG), etc. In one example, the monitoring device can also be used to determine the pulse pressure variability of the object to which it is connected and output an electrical signal characterizing the pulse pressure variability.

[0040] The monitoring device 100 also includes signal acquisition circuits 102 corresponding to various physiological parameters, and front-end signal processing circuits (not shown). The signal acquisition circuits 102 are used to acquire vital sign signals of the target object. The signal acquisition circuits 102 can be selected from electrocardiogram (ECG), respiratory, body temperature, blood oxygenation, non-invasive blood pressure, and invasive blood pressure circuits, etc. These signal acquisition circuits are electrically connected to corresponding sensor interfaces for electrical connection to sensor accessories corresponding to different physiological parameters. Their output terminals are coupled to the front-end signal processor, and the communication port of the front-end signal processor is coupled to the processor 101. The processor 101 is electrically connected to external communication and power interfaces. The processor 101 can be used to process the vital sign signals acquired by the signal acquisition circuits 102 to obtain the vital sign parameters of the target object.

[0041] The various physiological parameter measurement circuits can employ general-purpose circuits from existing technologies. The front-end signal processor samples and converts the output signals from the signal acquisition circuit to analog-to-digital conversion, and outputs control signals to control the physiological signal measurement process. In one possible implementation, the sensors can be separate or integrated, or some sensors can be separate while others are integrated. Integration can involve multiple different sensing modules being integrated onto the same circuit board, or multiple sensing functions being integrated into a single circuit, etc. This disclosure does not impose any limitations on this.

[0042] The memory 104 is used to store various data and executable programs generated by the monitoring equipment during the monitoring of the target object. For example, it stores the system program, various application programs, or algorithms that implement various specific functions of the monitoring equipment. It may include one or more computer program products, which can include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory. Non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. During the monitoring of the target object, any data that needs to be stored locally can be stored in the memory 104.

[0043] Processor 101 may be a central processing unit (CPU), a graphics processing unit (GPU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other processing units with data processing and / or instruction execution capabilities, and may control other components in the monitor to perform desired functions. For example, processor 101 may include one or more embedded processors, processor cores, microprocessors, logic circuits, hardware finite state machines (FSMs), digital signal processors (DSPs), graphics processing units (GPUs), or combinations thereof.

[0044] The processor 101 of the monitoring device 100 of this application is further configured to: process vital sign parameter data to obtain the pulse pressure variability (PPV) of the target subject. PPV is typically the ratio of the difference between the maximum and minimum pulse pressure during a respiratory cycle to the average pulse pressure. Optionally, the average pulse pressure can be the average of the maximum and minimum pulse pressures, while pulse pressure is the difference between the systolic and diastolic pressure of a single heartbeat. The processor 101 can process relevant data such as blood pressure (which can be invasive or non-invasive arterial blood pressure) in vital sign parameters to obtain the pulse pressure during each respiratory cycle, and then calculate the ratio of the difference between the maximum and minimum pulse pressure during each respiratory cycle to the average pulse pressure to obtain the PPV. The processor 101 can also obtain the PPV based on other methods. It is worth mentioning that the PPV parameter is calculated based on pulse pressure within a respiratory cycle and is refreshed at a preset time period. Therefore, the processor 101 can process the vital signs data in real time to obtain the pulse pressure variability of the target object, and the display 103 displays the PPV parameter in real time. Alternatively, if the preset time period includes multiple respiratory cycles, multiple PPV parameters can be calculated based on the vital signs parameters within multiple respiratory cycles, and then the average value is calculated.

[0045] The processor 101 is further configured to: when a second user instruction is received by the user via the first button, control the display of a menu window on the display 103 according to the second user instruction. The first button is located in the hotkey area of ​​the display 103. This first button may be, for example, a blood pressure measurement button (e.g., an NIBP measurement button or an IBP measurement button). The monitoring device of this application includes a display 103, and a switch button for turning the PPV detection and accuracy analysis function on or off is located within the menu window displayed on the display 103. Alternatively, in other examples, the switch button for turning the PPV detection and accuracy analysis function on or off is located in the hotkey area of ​​the display 103.

[0046] In one example, processor 101 is used to: acquire a first user instruction input by the user via a switch button; and, according to the first user instruction, start or stop processing the vital sign parameter data to obtain the pulse pressure variability (PPV) of the target object. The switch button allows the user to easily enable PPV parameter detection and its accuracy analysis as needed. Optionally, processor 101 can also process the vital sign parameter data in response to detecting that the PPV parameter switch is enabled to obtain the PPV of the target object and perform subsequent analysis of the accuracy of the PPV.

[0047] The processor 101 of the monitoring device 100 of this application is further configured to: acquire multiple associated parameters of the target object characterizing the accuracy of pulse pressure variability (PPV). These multiple associated parameters can be any parameters that can affect PPV accuracy. Optionally, the multiple associated parameters include tidal volume during mechanical ventilation of the target object, the target object's heart rate, the target object's respiratory rate, and the target object's electrocardiogram (ECG) parameters, or may include other associated parameters that can affect the accuracy of PPV. The target object's heart rate and ECG parameters are acquired in real-time by the monitoring device during the monitoring process.

[0048] The monitoring device can acquire multiple relevant parameters of the target object that can affect the accuracy of pulse pressure variability by any suitable method. For example, the monitoring device is connected to a ventilator that provides mechanical ventilation to the target object via a communication interface. The processor 101 is used to acquire tidal volume and / or respiratory rate from the ventilator via the communication interface.

[0049] In another example, the monitoring device 100 may also include a respiratory mechanics module for measuring tidal volume-related parameter signals of the target object during mechanical ventilation and outputting the parameter signals to a processor 101, which may also process the tidal volume-related parameter signals to obtain the tidal volume.

[0050] For example, regarding respiratory rate (i.e., respiratory frequency), the respiratory mechanics module of the monitoring device can also be used to measure the respiratory rate-related parameter signal of the target object during mechanical ventilation and output the parameter signal to the processor 101. The processor 101 can also be used to process the respiratory rate-related parameter signal to obtain the respiratory rate. Alternatively, the processor 101 can also be used to: acquire the target object's electrocardiogram (ECG) or blood oxygen saturation; and perform calculations on the ECG or blood oxygen saturation to obtain the target object's respiratory rate. Since the amplitude change of the ECG signal is related to respiratory motion, the ECG signal usually includes respiratory information. Therefore, the ECG parameter data can be processed using any suitable method known to those skilled in the art to obtain the target object's respiratory rate. For example, respiratory information such as respiratory rate can be obtained by analyzing the amplitude change of the ECG signal. Alternatively, the processor 101 can also obtain respiratory information such as respiratory frequency using methods for extracting respiratory information from ECG (ECG-Derived Respiratory Signal, abbreviated as EDR) or mixing signal partitioning methods. The processor 101 can also process the blood oxygen saturation data to obtain the respiratory rate using any suitable method, without any specific limitation.

[0051] To ensure the reliability of subsequent judgments, the ventilator can also incorporate gas leakage compensation and tubing compliance compensation mechanisms. When calculating various parameters or identifying arrhythmias based on ECG data, signal quality assessment and noise level evaluation mechanisms can be added to improve the accuracy of the aforementioned parameter calculations. Furthermore, the processor 101 of the monitoring device 100 of this application is also used to: determine the accuracy of pulse pressure variability (PPV) based on multiple associated parameters, and feed back the accuracy result of PPV to the user, so that the user can promptly detect errors in PPV values, thereby reducing the possibility of the user misjudging the patient's physiological state due to inaccurate PPV values. At the same time, it can also help clinicians correct the causes of inaccurate PPV values ​​in a timely manner, thereby ensuring the accuracy of PPV parameter monitoring and better assisting doctors in managing the patient's fluids. The processor 101 can compare multiple associated parameters with their respective preset conditions to determine the accuracy of PPV. For example, the processor 101 determines the accuracy of pulse pressure variability based on multiple associated parameters, including: determining whether the tidal volume is within a first preset range; determining whether the ratio of the target's heart rate to respiratory rate is within a second preset range; identifying whether the target has arrhythmia events based on electrocardiogram parameter data; and when the tidal volume is within the first preset range, the ratio of heart rate to respiratory rate is within the second preset range, and the target does not have arrhythmia events, the result of determining the accuracy of pulse pressure variability is accurate, while when the tidal volume is not within the first preset range, and / or the ratio of heart rate to respiratory rate is not within the second preset range, and / or the target has arrhythmia events, the result of determining the accuracy of pulse pressure variability is questionable. Questionable accuracy reflects that the PPV result may be inaccurate.

[0052] The first preset range can be any suitable range that can ensure the accuracy of PPV. For example, the first preset range is greater than or equal to 8 ml / kg. That is, when measuring PPV, in order to ensure that the result is accurate, the tidal volume must be greater than or equal to 8 ml / kg.

[0053] The second preset range can be any suitable range that ensures accurate PPV. For example, the second preset range is greater than or equal to 4, which means that when measuring PPV, the ratio of heart rate to respiratory rate should be greater than or equal to 4 to ensure accurate results.

[0054] In one example, processor 101 identifies whether a target object has an arrhythmia event based on electrocardiogram (ECG) parameter data. Arrhythmia events include, but are not limited to, ventricular fibrillation, ventricular tachycardia, or cardiac arrest. The processor can use any suitable method well-known to those skilled in the art to identify the ECG parameter data to determine the presence of an arrhythmia event. For example, the processor can use machine learning or deep learning methods (e.g., based on a neural network model) to identify and classify ECG signals to identify arrhythmia events. Optionally, processor 101 can analyze and identify the ECG parameter data at a preset time period (e.g., the preset time period could be 1s, 2s, 3s, or other suitable time periods) to determine the arrhythmia event.

[0055] The combined system of monitoring equipment and ventilator uses the processor of the monitoring equipment to perform real-time analysis of three indicators: the ratio of tidal volume, heart rate and respiratory rate, and the presence of arrhythmic events, to prevent erroneous PPV parameter values ​​from misleading clinical judgment.

[0056] The monitoring device 100 of this application also includes a display 103, which is used at least to display vital sign parameter data on a display interface. To facilitate users obtaining various key information, different information can be displayed in different areas, for example... Figure 2As shown, the display interface 300 may include a first parameter area for displaying vital sign parameters and a prompt information area 302 (also called an alarm display area) for displaying alarm or prompt information. The first parameter area may include a waveform area 303 (e.g., for displaying waveforms of one or more types of vital sign parameters, including but not limited to ECG, blood oxygen saturation, respiration (Resp), mean arterial pressure (ART), etc.), a waveform parameter area 304 (for displaying vital sign parameters corresponding to the waveform), and a waveformless parameter area 305 (e.g., for displaying data on the monitored subject's physiological parameters such as body temperature, non-invasive blood pressure (NIBP), pulse rate (PR), and vital sign parameters at one or more times (e.g., heart rate (HR), blood oxygen saturation, respiratory rate, blood pressure (BP))). The display interface may also include other display areas, such as a patient information area 301 for displaying patient information (e.g., displaying the patient type, such as adult, child, newborn, etc.) and a device prompt information area 306 (e.g., prompting...). The information display area is used to display one or more of the following: functional attributes, functional settings, and function keys, such as wireless information, volume information, and battery information; the hotkey area 307 (also known as the navigation area, which displays one or more hotkeys, such as review, standby, alarm settings, main menu, alarm reset, alarm pause, NIBB start / stop, NIBP measurement, NIBP stop all, and IBO zeroing); various function keys can be icons and / or text function keys. Users can perform corresponding functions by clicking the hotkeys in the hotkey area. For example, clicking the alarm settings hotkey will bring up a window with relevant alarm settings. The layout of the above display areas can be reasonably set according to actual needs. For example, the waveform parameter area can be located on one side of the waveform area, the hotkey area can be located at the bottom of the display interface, and the area without waveform parameters can be located between the smart hotkey area and the waveform area. The prompt information area 302 can be set at any suitable position on the display interface of the monitor 103. For example, the prompt information area 302 can be located above or to one side of the waveform parameter area, or above, below, or to one side of the waveform area. The second parameter area 308 is used to display the PPV value. The second parameter area 308 can be located outside the waveform parameter area 304, or the second parameter area 308 can be a sub-region of the waveform parameter area 304. The PPV can be calculated based on the mean arterial pressure, and therefore can be displayed outside the ART waveform. In one example, the second parameter area 308 can also display parameters such as pulse rate and pulse intensity.

[0057] In one example, processor 101 is also used to control the output of corresponding prompts based on accuracy, the prompts being used to characterize whether the pulse pressure variability is accurate. For example, as... Figure 2As shown, the processor is also used to: adjust the display format of pulse pressure variability (PPV) on the display 103 according to the accuracy result to provide a prompt to the user. For example, when the accuracy result is accurate, the display format is the first display format, and when the accuracy result is questionable, the display format is the second display format, wherein the first display format and the second display format are different; the display 103 is used to display vital sign parameter data and pulse pressure variability data in a display format, which is displayed through the monitor. When necessary, it promptly prompts the user of the inaccuracy of the PPV parameter to help the user correct it and ensure the accuracy of PPV parameter monitoring until the processor 101 monitors and analyzes and determines that the PPV accuracy conditions are met, and then restores the normal display of the PPV parameter value.

[0058] The monitor and ventilator combined system performs real-time background analysis. If the analysis result returns an error indicating that the PPV accuracy condition is not met (i.e., the processor 101 determines that the accuracy of the PPV is questionable), a prompt will be displayed on the monitor's display 103 using one of the following methods: The first display format and the second display format can be any suitable and differentiated display format for displaying the PPV value. For example, the first display format and the second display format have different fonts; for another example, the first display format and the second display format have different font colors; one of the first display format and the second display format is a flashing display, and the other is a non-flashing display; for another example, one of the first display format and the second display format displays the pulse pressure variability value in a hollow manner, and the other displays the pulse pressure variability value in a solid manner; for another example, the first display format and the second display format have different background patterns; for another example, one of the first display format and the second display format is a highlighted display, and the other is a normal display. Continuing with the example, the second display format includes replacing the pulse pressure variability (PPV) value with a preset pattern. For example, the PPV value can be displayed with asterisks, horizontal lines (such as double or single horizontal lines), and when the PPV value is accurate, the PPV value will be displayed directly, thereby achieving differentiated display.

[0059] In other examples, a first display format includes displaying a first marker adjacent to the pulse pressure variability (PPV) value while displaying the PPV value. A second display format includes displaying the PPV value without displaying the first marker, or displaying a second marker different from the first marker adjacent to the PPV value. For example, when the accuracy of the PPV value is in doubt, it can be marked outside the displayed PPV value using a first marker such as an asterisk or any other suitable marker. When the PPV value is accurate, only the PPV value can be displayed without the first marker. Alternatively, a second marker different from the first marker can be displayed adjacent to the PPV value. For example, the first and second markers may be different patterns, or the first and second markers may be markers made with different numbers of the same pattern, etc.

[0060] In one example, the monitor may also be equipped with an alarm device. For instance, the alarm device may alert the monitor to abnormal vital signs, or to indicate a medical condition in the monitored individual. Alternatively, when connection or operational abnormalities occur in any component of the monitor, the processor 101 may generate alarm information (e.g., an alarm signal). The alarm device is configured to trigger an alarm when the accuracy of the PPV value is questionable, including but not limited to visual and audible alarms. Specific forms may include flashing LEDs, buzzers, and speakers. For example, when the alarm device is a speaker, it can also output a prompt indicating the accuracy of the PPV value, such as a voice broadcast, meeting requirements for alarm signal strength sufficient to attract the observer's attention and alertness. In this way, real-time alarms can be implemented to alert the user.

[0061] Processor 101 is also used to control the output of corresponding prompts based on accuracy, the prompts being used to characterize whether the pulse pressure variability is accurate. In one example, continuing as... Figure 2 As shown, the processor 101 is also used to output corresponding prompt information based on the accuracy result. The display 103 can display the prompt information in an area adjacent to the displayed PPV, for example, the display 103 can display the prompt information in the prompt information area, or it can also display the prompt information in the second parameter area. Optionally, the prompt information includes the accuracy result, which can be accurate or questionable. When the result is accurate, the corresponding prompt information may not be displayed, but the prompt information is only displayed when the PPV accuracy result is questionable. Optionally, the prompt information may also include the reason for judging that the PPV accuracy result is questionable. By outputting the reason for the questionable PPV accuracy result, it can also help clinicians to correct the reasons for the inaccurate PPV value in a timely manner, thereby ensuring the accuracy of PPV parameter monitoring, so as to better assist doctors in managing patients' fluids.

[0062] In one example, multiple associated parameters include tidal volume during mechanical ventilation of the target subject, the target subject's heart rate, respiratory rate, and electrocardiogram (ECG) parameters. The reason for determining PPV accuracy as questionable includes one or more of the following: tidal volume is not within a first preset range, the heart rate-to-respiratory rate ratio is not within a second preset range, or the target subject experiences an arrhythmia event. The presence of an arrhythmia event is determined based on the target subject's ECG parameters. For example, as... Figure 2 As shown, the prompt information area 302 directly outputs a prompt message indicating that the accuracy of the PPV value is questionable. It further outputs the reason for the inaccuracy: the ratio of heart rate to respiratory rate is less than 4, which is below the first preset range, i.e., below the normal range, thus potentially leading to inaccurate PPV values. Alternatively, the display interface 103 can directly display the judgment results of non-compliance with tidal volume, the ratio of heart rate to respiratory rate, and abnormal heart rate events. Or, it can display the first preset range corresponding to tidal volume, the second preset range corresponding to the ratio of heart rate to respiratory rate, and the current tidal volume and the current ratio of heart rate to respiratory rate, allowing the user to judge the accuracy based on these conditions.

[0063] In one example, the display 103 can also display prompt information in a differentiated manner, such as highlighting or flashing. Optionally, when there are multiple causes, the display 103 is used to display the multiple causes alternately so that the user can promptly know the specific reason for the inaccurate PPV value. And / or, the display 103 can also be used to differentiate the multiple causes in a preset display format. For example, multiple causes can be displayed simultaneously, with each cause displayed in a different font and / or a different color and / or a different background.

[0064] Furthermore, in this embodiment of the invention, the effectiveness (also known as accuracy) of the PPV parameter is judged in real time based on parameters such as the ratio of tidal volume, heart rate, and respiratory rate, as well as electrocardiogram parameter data. During real-time monitoring, the processor 101 determines whether the PPV parameter switch is on or whether the PPV parameter needs to be displayed. If the switch is on or the PPV parameter needs to be displayed, the processor 101 judges the effectiveness of the PPV parameter from aspects such as tidal volume, the ratio of heart rate to respiratory rate, and arrhythmia, and finally prompts the judgment result to the user. In some embodiments, the processor 101 can further determine whether the accuracy judgment function of the PPV parameter is activated, that is, the monitoring device can provide a PPV parameter switch and a PPV accuracy judgment switch. When both the PPV parameter switch and the PPV accuracy judgment switch are on, the processor 101 judges the effectiveness of the PPV parameter and prompts the user with the effectiveness judgment result.

[0065] In one example, a review button is provided in the hotkey area of ​​the display 103. The processor 101 is also used to: acquire a review command input by the user via the review button; based on the review command, the review display interface of the display 103 displays historical data of pulse pressure variability (PPV), wherein accurate PPV historical data and questionable PPV historical data are displayed in different ways (e.g., different colors, different fonts, different backgrounds, etc.). Optionally, when there is questionable PPV historical data, the reasons for the doubt in the accuracy of the historical PPV data can also be displayed. By retrieving the historical PPV data, the user can trace the accuracy of PPV data.

[0066] In summary, the monitoring device according to this application can determine the accuracy of pulse pressure variability based on multiple related parameters, and feed back the accuracy results of pulse pressure variability to the user. This allows the user to promptly detect errors in PPV values, thereby reducing the possibility of misjudging the patient's physiological state due to inaccurate PPV values. At the same time, it can also help clinicians to correct the causes of inaccurate PPV values ​​in a timely manner, thus ensuring the accuracy of PPV parameter monitoring and better assisting doctors in managing the patient's fluids.

[0067] In another embodiment of this application, a monitoring device is provided for monitoring the vital signs parameters of a target object, continuing as follows: Figure 1 As shown, it includes: a signal acquisition circuit 102 for acquiring vital sign signals of the target object; a processor 101 for processing the vital sign signals to obtain vital sign parameters of the target object; the processor 101 is also used to: process the data of the vital sign parameters to obtain monitoring parameters for characterizing the volume responsiveness of the target object; acquire multiple associated parameters of the target object characterizing the accuracy of the monitoring parameters; and determine the accuracy of the monitoring parameters based on the multiple associated parameters, so as to feed back the accuracy results of the monitoring parameters to the user, so that the user can promptly discover errors in the values ​​of the monitoring parameters, thereby reducing the possibility of the user misjudging the patient's physiological state due to inaccurate monitoring parameters. At the same time, it can also help clinicians to correct the causes of inaccurate monitoring parameters in a timely manner, thereby ensuring the accuracy of volume responsiveness monitoring, so as to better assist doctors in managing the patient's fluids.

[0068] Optionally, the monitoring parameters may include stroke volume variability and / or pulse pressure variability, or any other suitable monitoring parameters for characterizing the volume responsiveness of the target object.

[0069] It is worth mentioning that the previous text explained the situation where the monitoring parameter is pulse pressure variability. For the specific details of stroke volume variability, please refer to the previous description of pulse pressure variability. It will not be described in detail here.

[0070] Furthermore, in yet another embodiment of this application, a monitoring device is provided for monitoring the vital signs parameters of a target object, continuing as follows: Figure 1 As shown, it includes: a signal acquisition circuit 102 for acquiring vital sign signals of a target object; a processor 101 for processing the vital sign signals to obtain vital sign parameters of the target object; the processor 101 is further configured to: process the data of the vital sign parameters to obtain monitoring parameters characterizing the capacity responsiveness of the target object; acquire the correlation features of the target object characterizing the accuracy of the monitoring parameters; and determine the accuracy of the monitoring parameters based on the correlation features. Optionally, the correlation features of the target object include the target object's disease status, for example, the target object's disease status can be obtained through user input or through the target object's electronic medical record.

[0071] The target subject's condition refers to any condition that can affect the accuracy of monitoring parameters such as stroke volume variability and / or pulse pressure variability. For example, when the target subject has a lung disease, such as pulmonary dysfunction, the accuracy of the stroke volume variability and / or pulse pressure variability values ​​cannot be guaranteed.

[0072] It is worth mentioning that some details of the monitoring device in the embodiments of this application can be referred to the preceding text, and will not be described in detail here.

[0073] The monitoring device in this application embodiment can also determine the accuracy of monitoring parameters such as stroke volume variability and / or pulse pressure variability by acquiring the associated features of the target object, so as to feed back the accuracy result of pulse pressure variability to the user, so that the user can promptly discover that the value of the monitoring parameter is incorrect, thereby reducing the possibility that the user misjudges the patient's physiological state due to inaccurate monitoring parameters.

[0074] Below, please refer to the appendix. Figure 3 The method for determining the accuracy of pulse pressure variability in this application is described. This method can be based on the aforementioned monitoring equipment as the execution subject. Without conflict, the various technical features in this document can be combined with each other.

[0075] As an example, such as Figure 3 As shown, the method for determining the accuracy of pulse pressure variability in this application includes the following steps S310 to S350:

[0076] First, in step S310, the vital signs signal of the target object is acquired.

[0077] The monitoring equipment has one or more sensors that detect signals of vital signs parameters of the monitored object (i.e., the target object). These vital signs parameters include at least one of the following: blood pressure, respiratory rate, heart rate, body temperature, pulse rate, blood oxygen saturation, cardiac output, end-tidal carbon dioxide, electroencephalogram (EEG), and electrocardiogram (ECG) data. The monitoring equipment can also communicate with a ventilator to obtain various data detected by the ventilator, such as tidal volume and respiratory rate.

[0078] Next, in step S320, the vital signs signals are processed to obtain the vital signs parameters of the target object. Various processing methods can be performed by the processor of the monitoring device to obtain the vital signs parameters. Please refer to the preceding description for details.

[0079] Next, in step S330, the vital signs data are processed to obtain the pulse pressure variability of the target object. The method for obtaining the pulse pressure variability can be found in the preceding text.

[0080] In step S340, multiple associated parameters of the target object characterizing the accuracy of pulse pressure variability are obtained; optionally, the multiple associated parameters include tidal volume when the target object is mechanically ventilated, the target object's heart rate, the target object's respiratory rate, and the target object's electrocardiogram parameter data, or other parameters that can affect the accuracy of pulse pressure variability.

[0081] Multiple associated parameters of a target object can be obtained through one or more of the following methods: for example, obtaining tidal volume and / or respiratory rate from a ventilator providing mechanical ventilation to the target object; and / or obtaining electrocardiogram (ECG) parameters or blood oxygen saturation of the target object; and performing calculations on the ECG parameters or blood oxygen saturation to obtain the respiratory rate of the target object. Alternatively, other suitable methods may also be used.

[0082] In step S350, the accuracy of pulse pressure variability is determined based on multiple correlation parameters.

[0083] In one example, determining the accuracy of pulse pressure variability based on multiple associated parameters includes: determining whether the tidal volume is within a first preset range, optionally, the first preset range is greater than or equal to 8 ml / kg; determining whether the ratio of the target subject's heart rate to respiratory rate is within a second preset range, optionally, the second preset range is greater than or equal to 4; identifying whether the target subject has arrhythmic events based on electrocardiogram parameter data; and when the tidal volume is within the first preset range, the ratio of heart rate to respiratory rate is within the second preset range, and the target subject does not have arrhythmic events, the result of determining the accuracy of pulse pressure variability is accurate. When the tidal volume is not within the first preset range, and / or the ratio of heart rate to respiratory rate is not within the second preset range, and / or the target subject has arrhythmic events, the result of determining the accuracy of pulse pressure variability is questionable.

[0084] When the accuracy of pulse pressure variability is determined to be questionable, a prompt message can be output. For example, the display format of pulse pressure variability on the monitor can be adjusted according to the accuracy result. The monitor is used to display vital sign parameters and pulse pressure variability data in a display format. In one example, when the accuracy result is accurate, the display format is a first display format; when the accuracy result is questionable, the display format is a second display format, wherein the first and second display formats have different fonts; and / or the first and second display formats have different font colors; and / or one of the first and second display formats is a blinking display, and the other is a non-blinking display; and / or one of the first and second display formats is a hollow display of the pulse pressure variability value, and the other is a solid display of the pulse pressure variability value; and / or the first and second display formats have different background patterns; and / or one of the first and second display formats is a highlighted display; and / or the first display format includes displaying the pulse pressure variability value in place of a specific pattern; and / or the first display format includes displaying a first mark adjacent to the pulse pressure variability value while displaying the pulse pressure variability value, and the second display format includes displaying the pulse pressure variability value but not displaying the first mark, or displaying a second mark different from the first mark adjacent to the pulse pressure variability value.

[0085] In another example, in addition to the changes in the PPV display format mentioned above as a prompt, an additional prompt can be output, or only a prompt can be output. For example, a prompt can be output based on the accuracy result; the data of vital signs parameters can be displayed, the data of pulse pressure variability can be displayed, and the prompt can be provided. Optionally, the prompt includes the accuracy result and the reason for judging the accuracy result as questionable. The prompt can be displayed in the form of a text description, or it can be played, for example, as an audio prompt, to prompt the user.

[0086] In one example, the reason for a PPV accuracy result of doubt may include one or more of the following: tidal volume is not within a first preset range, the ratio of heart rate to respiratory rate is not within a second preset range, or the target subject has an arrhythmia event, wherein the presence of an arrhythmia event in the target subject is determined based on the target subject's electrocardiogram parameter data.

[0087] The method in this application embodiment can also determine the accuracy of monitoring parameters such as stroke volume variability and / or pulse pressure variability by obtaining the associated features of the target object, so as to feed back the accuracy result of pulse pressure variability to the user, so that the user can promptly discover that the value of the monitoring parameter is incorrect, thereby reducing the possibility that the user misjudges the patient's physiological state due to inaccurate monitoring parameters.

[0088] In addition, embodiments of the present invention also provide a computer storage medium on which a computer program is stored. One or more computer program instructions may be stored on the computer-readable storage medium, and a processor may execute the program instructions stored in the storage device to implement the functions (implemented by the processor) in the embodiments of the present invention and / or other desired functions, such as performing corresponding steps of a method for determining the accuracy of pulse pressure variability according to embodiments of the present invention. Various application programs and various data may also be stored in the computer-readable storage medium, such as various data used and / or generated by the application programs.

[0089] For example, computer storage media may include a memory card for a smartphone, a storage component for a tablet computer, a hard disk for a personal computer, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a portable compact disc read-only memory (CD-ROM), a USB memory, or any combination of the above storage media.

[0090] Although exemplary embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above exemplary embodiments are merely illustrative and are not intended to limit the scope of the invention. Various changes and modifications can be made therein by those skilled in the art without departing from the scope and spirit of the invention. All such changes and modifications are intended to be included within the scope of the invention as claimed in the appended claims.

[0091] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0092] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed.

[0093] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0094] Similarly, it should be understood that, in order to streamline the invention and aid in understanding one or more of the various aspects of the invention, features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof in the description of exemplary embodiments of the invention. However, this approach should not be construed as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the corresponding claims, its inventive point lies in solving the corresponding technical problem with fewer features than all of those in a single disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of the invention.

[0095] Those skilled in the art will understand that, apart from the mutual exclusion of features, all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or elements of any method or apparatus so disclosed can be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature serving the same, equivalent, or similar purpose.

[0096] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features but not others included in other embodiments, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0097] The various component embodiments of the present invention can be implemented in hardware, or as software modules running on one or more processors, or a combination thereof. Those skilled in the art will understand that microprocessors or digital signal processors (DSPs) can be used in practice to implement some or all of the functions of some modules according to embodiments of the present invention. The present invention can also be implemented as an apparatus program (e.g., a computer program and computer program product) for performing some or all of the methods described herein. Such programs implementing the present invention can be stored on a computer-readable medium, or can be in the form of one or more signals. Such signals can be downloaded from an Internet website, provided on a carrier signal, or provided in any other form.

[0098] It should be noted that the above embodiments are illustrative of the invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

Claims

1. A monitoring device for monitoring the vital signs parameters of a target object, characterized in that, include: Signal acquisition circuit, used to acquire vital signs signals of the target object; Display, including the display interface; A processor is configured to process the vital sign signals to obtain the vital sign parameters of the target object; the processor is further configured to: The vital signs data are processed to obtain the pulse pressure variability of the target object; Obtain multiple associated parameters of the target object that characterize the accuracy of the pulse pressure variability; Based on the aforementioned multiple correlation parameters, the accuracy of the pulse pressure variability is determined. These multiple correlation parameters include tidal volume during mechanical ventilation of the target subject, the target subject's heart rate, respiratory rate, and electrocardiogram (ECG) parameters. Determining the accuracy of the pulse pressure variability includes: Determine whether the tidal volume is within a first preset range; Determine whether the ratio of the target object's heart rate to its respiratory rate is within a second preset range; Based on the electrocardiogram parameter data, identify whether the target object has arrhythmia events; When the tidal volume is within a first preset range, the ratio of heart rate to respiratory rate is within a second preset range, and the target subject does not experience any arrhythmic events, the accuracy of the pulse pressure variability is determined to be accurate; when the tidal volume is not within the first preset range, the ratio of heart rate to respiratory rate is not within the second preset range, and / or the target subject experiences any arrhythmic events, the accuracy of the pulse pressure variability is determined to be questionable; and The system controls the display of the pulse pressure variability value on the display interface of the monitor, and outputs a prompt message on the accuracy of the pulse pressure variability when the accuracy result is questionable. The prompt message includes the accuracy result and the reason for judging that the accuracy result is questionable. The reason includes one or more of the following reasons: the tidal volume is not within a first preset range, the ratio of heart rate to respiratory rate is not within a second preset range, or the target object has an arrhythmia event.

2. The monitoring device as described in claim 1, characterized in that, The monitoring device further includes a communication interface, through which the monitoring device is communicatively connected to a ventilator that provides mechanical ventilation to the target object. The processor is configured to: obtain the tidal volume and / or the respiratory rate from the ventilator through the communication interface.

3. The monitoring device as described in claim 1, characterized in that, The monitoring device also includes a respiratory mechanics module. The respiratory mechanics module is used to measure tidal volume-related parameter signals of the target object during mechanical ventilation, and the processor is used to process the tidal volume-related parameter signals to obtain the tidal volume; and / or, The respiratory mechanics module is used to measure the respiratory rate-related parameter signals of the target object during mechanical ventilation, and the processor is used to process the respiratory rate-related parameter signals to obtain the respiratory rate.

4. The monitoring device as described in claim 1, characterized in that, The processor is also used for: Obtain the electrocardiogram (ECG) parameters or blood oxygen saturation of the target object; The electrocardiogram parameter data or blood oxygen saturation are processed to obtain the respiratory rate of the target object.

5. The monitoring device as described in claim 1, characterized in that, The first preset range is greater than or equal to 8 ml / kg; The second preset range is greater than or equal to 4.

6. The monitoring device as described in claim 1, characterized in that, The processor is also configured to: adjust the display format of the pulse pressure variability on the display based on the accuracy result; The display is used to show the data of the vital signs parameters and the data of the pulse pressure variability in the display format.

7. The monitoring device as described in claim 6, characterized in that, When the accuracy result is accurate, the display format is the first display format; when the accuracy result is uncertain, the display format is the second display format, wherein the first display format and the second display format are different.

8. The monitoring device as described in claim 7, characterized in that, The first display format and the second display format have different fonts; and / or The first display format and the second display format have different font colors; and / or One of the first display mode and the second display mode is a blinking display, and the other is a non-blinking display; and / or One of the first display format and the second display format is a hollow display of pulse pressure variability values, and the other is a solid display of pulse pressure variability values; and / or The first display format and the second display format have different background patterns; and / or One of the first display format and the second display format is a highlighted display; and / or The second display format includes replacing the numerical value of the pulse pressure variability with a preset pattern; and / or The first display format includes displaying a first marker adjacent to the pulse pressure variability value while displaying the pulse pressure variability value, and the second display format includes displaying the pulse pressure variability value but not displaying the first marker, or displaying a second marker different from the first marker adjacent to the pulse pressure variability value.

9. The monitoring device as described in claim 1, characterized in that, The display interface includes a first parameter area, a second parameter area, a prompt information area, and a hotkey area for displaying the vital signs parameters. The first parameter area includes a waveform area and a waveform parameter area for displaying the waveforms of the vital signs parameters. The second parameter area is used to display the pulse pressure variability value. The prompt information area is used to display the prompt information, or the second parameter area is also used to display the prompt information. The second parameter area is located outside the first parameter area. The parameters displayed in the first parameter area include arterial pressure, and the pulse pressure variability is displayed outside the waveform of the arterial pressure.

10. The monitoring device as described in claim 1, characterized in that, When the cause includes multiple causes, the display is used to alternately display the multiple causes, and / or the display is used to differentiate the multiple causes in a preset display format.

11. The monitoring device as described in claim 1, characterized in that, The display interface includes a hotkey area, in which a review button is provided. The processor is further configured to: acquire a review command input by the user through the review button; and based on the review command, display historical data of pulse pressure variability on the review display interface of the display, wherein accurate historical data of pulse pressure variability and questionable historical data of pulse pressure variability are displayed in different ways.

12. A monitoring device for monitoring the vital signs parameters of a target object, characterized in that, include: A signal acquisition circuit is used to acquire the vital signs signals of the target object; Display, including the display interface; A processor is configured to process the vital sign signals to obtain the vital sign parameters of the target object; the processor is further configured to: The data of the vital signs parameters are processed to obtain monitoring parameters used to characterize the capacity responsiveness of the target object; Obtain multiple associated parameters of the target object that characterize the accuracy of the monitoring parameters; Based on the aforementioned multiple correlation parameters, the accuracy of the monitoring parameters is determined. These multiple correlation parameters include tidal volume during mechanical ventilation of the target subject, the target subject's heart rate, the target subject's respiratory rate, and the target subject's electrocardiogram (ECG) parameters. Determining the accuracy of the monitoring parameters includes: Determine whether the tidal volume is within a first preset range; Determine whether the ratio of the target object's heart rate to its respiratory rate is within a second preset range; Based on the electrocardiogram parameter data, identify whether the target object has arrhythmia events; When the tidal volume is within a first preset range, the ratio of heart rate to respiratory rate is within a second preset range, and the target subject does not experience any arrhythmic events, the accuracy of the pulse pressure variability is determined to be accurate; when the tidal volume is not within the first preset range, the ratio of heart rate to respiratory rate is not within the second preset range, and / or the target subject experiences any arrhythmic events, the accuracy of the pulse pressure variability is determined to be questionable; and The system controls the display of the monitoring parameter values ​​on the display interface and outputs a prompt message indicating the accuracy of the monitoring parameter when the accuracy result is questionable. The prompt message includes the accuracy result and the reason for the questionable accuracy result. The reason includes one or more of the following: the tidal volume is not within a first preset range, the ratio of heart rate to respiratory rate is not within a second preset range, or the target object has an arrhythmia event.

13. The monitoring device as described in claim 12, characterized in that, The monitoring parameters include stroke volume variability and / or pulse pressure variability.

14. A monitoring device for monitoring the vital signs parameters of a target object, characterized in that, include: A signal acquisition circuit is used to acquire the vital signs signals of the target object; A processor is configured to process the vital sign signals to obtain the vital sign parameters of the target object; the processor is further configured to: The data of the vital signs parameters are processed to obtain monitoring parameters used to characterize the capacity responsiveness of the target object; Obtain the correlation features of the target object that characterize the accuracy of the monitoring parameters; Based on the aforementioned correlation features, the accuracy of the monitoring parameters is determined; as well as The system controls the display of the monitored parameter values ​​on the monitor's display interface, and outputs a prompt message indicating the accuracy of the monitored parameter when the accuracy result is questionable. The prompt message includes the accuracy result and the reason why the accuracy result is questionable.

15. The monitoring device as described in claim 14, characterized in that, The associated features include the target object's disease status.

16. The monitoring device as described in claim 15, characterized in that, The target subject's illness is pulmonary dysfunction.

17. A method for determining the accuracy of pulse pressure variability, characterized in that, The method includes: Obtain the vital signs parameters of the target object; The vital signs data are processed to obtain the pulse pressure variability of the target object; Obtain multiple associated parameters of the target object that characterize the accuracy of the pulse pressure variability; Based on the aforementioned multiple correlation parameters, the accuracy of the pulse pressure variability is determined. These parameters include tidal volume during mechanical ventilation of the target subject, the target subject's heart rate, respiratory rate, and electrocardiogram (ECG) parameters. Determining the accuracy of the pulse pressure variability includes: determining whether the tidal volume is within a first preset range; determining whether the ratio of the target subject's heart rate to respiratory rate is within a second preset range; identifying whether the target subject experiences arrhythmia based on the ECG parameters; and determining the accuracy of the pulse pressure variability as questionable when the tidal volume is not within the first preset range, and / or the ratio of the heart rate to respiratory rate is not within the second preset range, and / or the target subject experiences arrhythmia. The system controls the display of the pulse pressure variability value on the monitor's display interface. When the accuracy result is questionable, it outputs a prompt message indicating the accuracy of the pulse pressure variability. The prompt message includes the accuracy result and the reason for judging that the accuracy result is questionable. The reason includes one or more of the following reasons: the tidal volume is not within a first preset range, the ratio of heart rate to respiratory rate is not within a second preset range, or the target object has an arrhythmia event.

18. The method as described in claim 17, characterized in that, The acquisition of multiple associated parameters of the target object characterizing the accuracy of the pulse pressure variability includes: The tidal volume and / or the respiratory rate are obtained from the ventilator that provides mechanical ventilation to the target object; And / or, acquire the electrocardiogram (ECG) parameter data or blood oxygen saturation of the target object; perform calculations on the ECG parameter data or blood oxygen saturation to obtain the respiratory rate of the target object.

19. The method as described in claim 17, characterized in that, The first preset range is greater than or equal to 8 ml / kg; The second preset range is greater than or equal to 4.

20. The method as described in claim 17, characterized in that, The method further includes: adjusting the display format of the pulse pressure variability on the display based on the accuracy result; The display is used to show the data of the vital signs parameters and the data of the pulse pressure variability in the display format.

21. The method as described in claim 20, characterized in that, When the accuracy result is accurate, the display format is the first display format; when the accuracy result is uncertain, the display format is the second display format, wherein the first display format and the second display format have different fonts; and / or The first display format and the second display format have different font colors; and / or One of the first display mode and the second display mode is a blinking display, and the other is a non-blinking display; and / or One of the first display format and the second display format is a hollow display of pulse pressure variability values, and the other is a solid display of pulse pressure variability values; and / or The first display format and the second display format have different background patterns; and / or One of the first display format and the second display format is a highlighted display; and / or The first display format includes replacing the pulse pressure variability value with a specific pattern; and / or The first display format includes displaying a first marker adjacent to the pulse pressure variability value while displaying the pulse pressure variability value, and the second display format includes displaying the pulse pressure variability value but not displaying the first marker, or displaying a second marker different from the first marker adjacent to the pulse pressure variability value.

22. The method according to any one of claims 17 to 21, characterized in that, Also includes: The system displays the data of the vital signs parameters, the data of the pulse pressure variability, and the prompt information.

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