A syncope detection method and system based on an upright tilt table

Abstract

The present application relates to the technical field of rehabilitation equipment, and particularly relates to a syncope detection method and system based on an upright tilt bed. The method of the present application comprises: acquiring basic information of a user, and determining a tilt parameter according to the basic information; the basic information comprises age, and the tilt parameter comprises a tilt angle; controlling the upright tilt bed to tilt based on the tilt parameter, so as to perform syncope detection, and simultaneously collecting physiological data of the user, wherein the physiological data comprises blood pressure; during the syncope detection, the method further comprises: adjusting the tilt angle according to a change of the physiological data within the maintenance time; and generating a detection report based on the physiological data in response to the detection being completed. The method of the present application can improve the accuracy and safety of syncope detection.

Description

Technical Field

[0001] This invention relates to the field of rehabilitation equipment technology. More specifically, this invention relates to a method and system for detecting syncope based on an upright tilting bed. Background Technology

[0002] The tilt table test is a diagnostic method used to treat syncope of unknown origin, primarily vasovagal syncope and other types of syncope of unknown cause. The general procedure for the tilt table test is as follows: First, the subject is secured to a tilt table, and equipment such as an electrocardiograph, sphygmomanometer, and bedside monitor are connected to the subject's body. The tilt table is then tilted to a certain angle and brought to a standstill using manual or electric adjustments. Physiological data of the subject is acquired at regular intervals using the electrocardiograph, sphygmomanometer, and bedside monitor. Medical staff record the measured physiological data to facilitate subsequent diagnosis and analysis based on the physiological parameters.

[0003] However, most existing tilt tests rely on setting a tilt angle based on experience, and then conducting the test based on that angle. Due to limitations in the experience of medical personnel, improper setting of parameters such as the angle may lead to misdiagnosis / misjudgment. Therefore, improving the accuracy of the tilt test is a pressing technical problem that needs to be solved. Summary of the Invention

[0004] To address the technical problem that setting the tilt angle based on experience may lead to misdiagnosis / misjudgment, the present invention provides solutions in the following aspects.

[0005] In a first aspect, the present invention provides a method for detecting syncope based on an upright tilting bed, the method comprising: acquiring basic information of a user; determining tilt parameters based on the basic information; the basic information including age; the tilt parameters including tilt angle; controlling the tilt of the upright tilting bed based on the tilt parameters to perform syncope detection, while simultaneously collecting physiological data of the user, the physiological data including blood pressure; further comprising, during the syncope detection process, adjusting the tilt angle according to changes in the physiological data over a specified duration; and generating a detection report based on the physiological data in response to the end of the detection.

[0006] Further, determining the tilt parameter based on the basic information includes: based on the basic information, searching a preset number of cases most similar to the user from a preset case database, the content of the cases including the angle of syncope occurrence; and determining the tilt angle based on the angle of syncope occurrence.

[0007] Further, determining the tilt angle based on the angle of syncope occurrence includes: determining the tilt angle based on the minimum value of the angle of syncope occurrence, wherein the tilt angle is positively correlated with the minimum value.

[0008] Furthermore, the user's physiological data is collected, including: obtaining an angle range based on the angle of syncope; and increasing the sampling frequency of the physiological data in response to the upright tilting bed reaching the angle range.

[0009] Furthermore, adjusting the tilt angle based on the changes in the physiological data during the maintenance period includes: if the change in the physiological data does not reach a threshold during the maintenance period, then increasing the tilt angle.

[0010] Furthermore, before increasing the tilt angle, the method further includes adjusting the maintenance time based on the difference between the user's current physiological data and the physiological data of the most similar case.

[0011] Furthermore, the process of detecting fainting also includes: acquiring the angle and vibration frequency of the upright tilting bed; if the change value of the angle per unit time is greater than a set value, and there is a signal with a frequency greater than a set value that lasts for a set time, then an alarm is triggered to prompt the user that a fall has occurred.

[0012] Furthermore, the process of detecting syncope also includes: for any physiological parameter in the physiological data, obtaining the degree of abnormality based on the difference between the physiological parameter and the corresponding reference baseline; matching an abnormality score according to the range of the degree of abnormality; summing the abnormality scores corresponding to each physiological parameter to obtain a comprehensive score; and triggering the corresponding syncope treatment strategy according to the range of the comprehensive score.

[0013] Furthermore, it also includes: maintaining a tilt angle of 0° for a specified time while collecting the user's physiological data.

[0014] In a first aspect, the present invention provides a syncope detection system based on an upright tilt bed, comprising a processor and a memory, the memory storing computer program instructions that, when executed by the processor, implement the syncope detection method based on an upright tilt bed as described in the first aspect.

[0015] The beneficial effects of this invention are as follows: By matching the tilt angle according to the user's basic information, this invention can reduce misdiagnosis caused by setting the tilt angle based on experience, thereby improving the accuracy of syncope detection; by dynamically adjusting the tilt angle according to the user's physiological data, it avoids the situation where the initial tilt angle cannot effectively stimulate syncope-related reactions, thereby improving the efficiency and accuracy of syncope detection; by providing timely warnings and handling before syncope and falls occur, it can ensure the safety of the user's syncope detection. Attached Figure Description

[0016] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0017] Figure 1 This is a flowchart illustrating a syncope detection method based on an upright inclined bed according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic block diagram illustrating the structure of a syncope detection system based on an upright inclined bed according to an embodiment of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0021] Figure 1 This is a flowchart illustrating a syncope detection method based on an upright inclined bed according to an embodiment of the present invention.

[0022] In a first aspect, the present invention provides a method for detecting syncope based on an upright tilt bed, applicable to upright tilt detection / tests performed during clinical screening of the causes of syncope or orthostatic intolerance in patients, such as... Figure 1 As shown, the method of the present invention includes:

[0023] S101. Obtain the user's basic information and determine the tilt parameters based on the basic information.

[0024] In one embodiment, the user's basic information includes age, gender, baseline blood pressure / heart rate, and syncope type (if applicable). Specifically, before the test, the user enters basic information on a display screen to obtain the user's basic information. Further, the tilt parameters include tilt angle, tilt speed, and duration (i.e., the time spent remaining stationary at the tilt angle).

[0025] Specifically, a case database is first constructed, which stores multiple cases. Each case contains information including age, gender, baseline blood pressure / heart rate, tilt parameters, physiological data (e.g., blood pressure, heart rate) during the tilt test, and diagnostic results (e.g., syncope type). Among these, the tilt parameters in the case include the angle of syncope, the time of syncope onset, and the tilt speed.

[0026] Further, based on the user's basic information, a preset number of cases most similar to the user are searched from the case database. Specifically, the KNN algorithm (K-nearest neighbor algorithm, k set to 5) is used to find the 10 cases most similar to the user. Then, the user's angle interval (i.e., the angle interval composed of the minimum and maximum values ​​of the syncope occurrence angle) is determined based on the syncope occurrence angle of these 10 cases. Finally, the user's tilt angle is determined based on this angle interval. In one embodiment, the tilt angle can be determined based on the minimum value of the angle interval, where the tilt angle is positively correlated with the minimum value of the angle interval. Specifically, the minimum value is added to an adjustment value (in this embodiment, the adjustment value can be set to 5°) to obtain the tilt angle. For example, if the angle interval formed by the syncope occurrence angles of the 10 cases most similar to the user is 55° to 78°, then the user's tilt angle is 60°. In an optional embodiment, the minimum value of the angle interval can also be multiplied by a preset ratio to obtain the tilt angle.

[0027] In an optional embodiment, the median or average angle of syncope occurrence in 10 cases can be used as the tilt angle, which can be set according to actual needs by those skilled in the art.

[0028] The methods for determining the tilt rate and duration are similar to those for determining the tilt angle. Specifically, the average, median, or minimum tilt rate of the 10 most similar cases can be used as the user's tilt rate, and the average or median time of syncope onset of the 10 most similar cases can be used as the user's duration. In an optional embodiment, medical personnel can also set the tilt angle (60°-90°), tilt rate (1°-20° / s), and duration (5-45 minutes) according to actual needs.

[0029] By determining tilt parameters based on cases most similar to the user's basic information, misdiagnosis caused by improperly set tilt parameters based on experience can be reduced, thereby improving the accuracy and reliability of the tilt test. Furthermore, testing based on tilt parameters determined from the most similar cases can effectively shorten testing time while ensuring the tilt angle is set within a reasonable range, thus improving the efficiency and safety of the tilt test.

[0030] S102. Based on the tilt parameters, control the tilt of the upright tilt bed to detect syncope and collect the user's physiological data.

[0031] During the tilt test, the user lies supine on the tilt bed (tilt angle 0°), the chest strap and leg straps are secured, and the position is maintained for a set time (5 minutes in this embodiment). The system then controls the tilt bed to tilt at a set speed to reach the desired tilt angle and maintain that angle for the corresponding duration. Simultaneously, during the syncope detection process, the user's physiological data is collected in real time. In this embodiment, the physiological data includes blood pressure, heart rate, blood oxygen saturation, and electrocardiogram (ECG). Specifically, the ECG can be collected via ECG leads, blood pressure via a blood pressure cuff, blood oxygen saturation via a pulse oximeter, and heart rate via a heart rate sensor.

[0032] In one embodiment, when collecting physiological data, if the angle of the upright tilting bed reaches the user's angle range, the sampling frequency of the physiological data is increased. Specifically, when the angle range is not reached, the sampling frequency of the physiological data is 100Hz; when the angle range is reached, the sampling frequency of the physiological data is increased to 500Hz. In an optional embodiment, those skilled in the art can adjust the sampling frequency of the physiological data according to actual needs.

[0033] Since the angle range is obtained based on cases most similar to the user's, it represents the angle at which the user is likely to experience syncope. Therefore, by increasing the sampling frequency of physiological data within the angle range where the user is likely to experience syncope, it is possible to promptly detect whether the user is experiencing syncope and take appropriate action (such as issuing an alarm, automatic reset, or resetting by pressing a reset button), thereby ensuring the user's safety during the testing process. Furthermore, by increasing the sampling frequency, the onset, duration, and amplitude of physiological data changes of syncope can be recorded in detail, providing crucial evidence for subsequent in-depth analysis and diagnosis, reducing the probability of misdiagnosis, and thus improving the accuracy of the tilt table test.

[0034] During the maintenance of the tilt angle, the maintenance time is adjusted based on the difference between the current physiological data and the physiological data of the 10 most similar cases. Specifically, the current blood pressure is compared with the blood pressure curve of the most similar cases. If the difference in the slope of blood pressure drop is less than a preset threshold, the maintenance time is extended. In this embodiment, the median of the slope of blood pressure drop of the 10 most similar cases is used as a reference value. Then, the difference between the user's current blood pressure drop slope and the reference value is calculated. If the difference is less than 10% (i.e., the preset threshold), the maintenance time is extended. It should be noted that the slope of blood pressure drop in the cases refers to the slope of blood pressure drop during syncope.

[0035] Furthermore, the user's current RMSSD is compared with the RMSSD of the most similar case. If the current RMSSD is greater than the sum of the mean RMSSD of the most similar case and twice the standard deviation of the RMSSD, it indicates that the current data has significantly deviated from the safe range. In this case, the upright tilt bed is quickly reset to the horizontal position, and the motor power is disconnected. Similarly, if the current physiological data such as blood pressure also significantly deviate from the safe range, the test is immediately terminated to ensure the user's safety. RMSSD (Root Mean Square of the Successive Differences) is an indicator used to assess heart rate variability (HRV) and is commonly used in the analysis of Holter monitoring.

[0036] Simultaneously, the user's current detection time is compared with the syncope occurrence time of the 10 most similar cases. If the difference between the current detection time and the median syncope occurrence time is less than a preset value (in this embodiment, -2), the maintenance time can be extended. In an optional embodiment, the time can also be close to the median syncope occurrence time, for example, within the first 3 minutes before reaching the median syncope occurrence time.

[0037] For example, if the partial content of the 10 cases most similar to the user is shown in Table 1:

[0038]

[0039] If the current data is: current detection time is 7 minutes, blood pressure drop slope is -2.9% / min, RMSSD = 26, and since the current detection time is less than the median syncope time, and the difference between the current blood pressure drop slope and the median is less than 10%, the maintenance time is extended. Specifically, the original duration is added to the buffer time (set to 3 minutes in this embodiment) to obtain the extended maintenance time. For example, the original maintenance time of 10 minutes is extended to 13 minutes; if the changes in various physiological parameters in the user's physiological data do not exceed the threshold within these 13 minutes (e.g., the change in blood pressure data does not exceed 5%), the tilt angle is increased. For example, if the original tilt angle is 60°, it can be increased to 65° or 70° (not exceeding the maximum value of the angle range). Those skilled in the art can set the increase in tilt angle according to actual needs.

[0040] By dynamically adjusting the maintenance time and tilt angle based on the difference between the user's physiological data and that of the most similar case during the detection process, the user's sensitivity can be increased, thereby improving the efficiency and accuracy of syncope detection. At the same time, it ensures that the adjusted maintenance time and tilt angle are within a safe range, thus improving the safety of syncope detection for the user.

[0041] In an optional embodiment, the method of the present invention further includes: for any physiological parameter in the physiological data, obtaining the degree of abnormality based on the difference between the physiological parameter and the corresponding reference baseline; specifically, acquiring the user's blood pressure abnormality, heart rate abnormality, and blood oxygen abnormality. In one embodiment, the blood pressure abnormality can be obtained by dividing the difference between the baseline blood pressure and the current blood pressure by the baseline blood pressure; the heart rate abnormality can be obtained by dividing the absolute value of the difference between the baseline heart rate and the current heart rate by the baseline heart rate; and the blood oxygen abnormality can be obtained by subtracting the baseline blood oxygen from the current blood oxygen. It should be noted that the reference baseline refers to the physiological data monitored when the user is resting in a horizontal position (supine position), that is, the physiological data collected after maintaining a tilt angle of 0° for five minutes.

[0042] Furthermore, anomaly scores are matched based on the range of abnormality levels of the parameters. Specifically, for the blood pressure parameter, if the blood pressure abnormality level is greater than or equal to 20%, the blood pressure abnormality score is 40 points; if the blood pressure abnormality level is greater than or equal to 10% and less than 20%, the blood pressure abnormality score is 20 points; and if the blood pressure abnormality level is less than 10%, the blood pressure abnormality score is 0 points. Similarly, for the heart rate parameter, if the heart rate abnormality level is greater than or equal to 30%, the heart rate abnormality score is 30 points; if the heart rate abnormality level is greater than or equal to 15% and less than 30%, the heart rate abnormality score is 15 points; and if the heart rate abnormality level is less than 15%, the heart rate abnormality score is 0 points. Similarly, for the blood oxygen parameter, if the blood oxygen abnormality level is greater than or equal to 5%, the blood oxygen abnormality score is 20 points; if the blood oxygen abnormality level is greater than or equal to 3% and less than 5%, the blood oxygen abnormality score is 10 points; and if the blood oxygen abnormality level is less than 3%, the blood oxygen abnormality score is 0 points.

[0043] Furthermore, the abnormal scores for each physiological parameter are summed to obtain a comprehensive score; the corresponding syncope management strategy is triggered based on the range of the comprehensive score. Specifically, if the comprehensive score is greater than or equal to 70, the upright tilt bed is immediately restored to a horizontal position and the motor power is cut off; if the comprehensive score is less than 70 but greater than or equal to 50, the tilt angle is reduced and an alarm is issued; if the comprehensive score is less than 50, monitoring continues.

[0044] In one embodiment, in the emergency reset strategy, the upright tilting bed can be controlled to reset to 0° at 10° / s; in the tilt reduction strategy, the upright tilting bed can be controlled to decrease to 30° at 5° / s.

[0045] For example, if a user's baseline blood pressure is 120 mmHg, baseline heart rate is 70 bpm, and blood oxygen saturation is 98%, and the current blood pressure is 90 mmHg, current heart rate is 45 bpm, and current blood oxygen saturation is 92%, then the blood pressure abnormality is 25%, corresponding to a blood pressure abnormality score of 40 points; the heart rate abnormality is 37.5%, corresponding to a heart rate abnormality score of 30 points; and the blood oxygen abnormality is 6%, corresponding to a blood pressure abnormality score of 20 points. At this time, the user's overall score is 90 points, and the system controls the upright tilting bed to reset to a horizontal position and cuts off the power.

[0046] By combining multiple parameters to determine whether a user is likely to faint, misjudgment caused by a single factor can be avoided, thereby improving the accuracy of judging whether a user may faint. This allows for timely implementation of appropriate measures before a user faints, thus improving the safety of fainting detection.

[0047] In one embodiment, during the syncope detection process, the method of the present invention further includes: acquiring the angle and vibration frequency of the upright tilting bed; if the change in angle within a unit time is greater than a preset value, and a high-frequency impact signal lasting for a preset time exists, it indicates that the user may have fallen, triggering a fall alarm. Specifically, if the change in angle of the upright tilting bed is detected to be greater than 10° within 1 second, it is determined to be an abnormal tilt; simultaneously, if a high-frequency impact signal appears and lasts for more than 0.5 seconds, it is determined that the user may have fallen, and a buzzer is activated to alert medical personnel. In this embodiment, high frequency refers to a signal with a frequency greater than 5Hz.

[0048] It should be noted that during the electric tilting process, the judgment of tilt anomalies is ignored to avoid false alarms caused by normal adjustment of the upright tilting bed angle. In addition, a delay confirmation (lasting 200ms) can be added to avoid false alarms triggered by momentary interference (such as equipment collision) or human operation (expected vibration during motor drive).

[0049] In one embodiment, the angle of the upright tilting bed can be detected in real time using a gyroscope or accelerometer, and the vibration frequency of the upright tilting bed can be detected in real time using an accelerometer.

[0050] In one embodiment, physiological data can also be used to comprehensively determine whether a user has fallen. Specifically, while detecting the aforementioned tilting and vibration abnormalities, if abnormal physiological data of the user is also detected, such as a sudden drop in heart rate (e.g., ΔHR > 30 or 40 beats / min) or a sudden drop in blood pressure (systolic blood pressure < 70 or 80 mmHg), the fall alarm is strengthened, the upright tilting bed is slowly reset to 0°, and the motor power is cut off. By determining whether a user has fallen during syncope detection, appropriate measures can be taken in a timely manner, thereby ensuring the safety of syncope detection. By comprehensively considering angle factors, vibration characteristics, and physiological data to determine whether a user has fallen, misjudgments caused by a single factor can be avoided, thereby improving the accuracy of fall detection and thus improving the safety of syncope detection.

[0051] S103. In response to the end of the detection, a detection report is generated based on the physiological data.

[0052] Specifically, after the test is completed, the upright tilt bed is slowly returned to the horizontal position (i.e., 0°), and a test report is generated. The test report includes the angle change curve and a detailed record of physiological parameters.

[0053] Furthermore, if a user's diagnosis result is positive, the user's basic information and physiological data will be updated in the case database to enrich the case database and provide reference data for subsequent syncope testing of other users.

[0054] Figure 2 This is a schematic block diagram illustrating the syncope detection system based on an upright tilted bed according to this embodiment.

[0055] In a second aspect, the present invention also provides a syncope detection system based on an upright tilting bed. For example... Figure 2 As shown, the syncope detection system includes a processor and a memory. The memory stores computer program instructions, which, when executed by the processor, implement a syncope detection method based on an upright tilting bed according to the first aspect of the present invention.

[0056] The syncope detection system also includes other components well known to those skilled in the art, such as communication interfaces. Their settings and functions are known in the art and will not be described in detail here.

[0057] In this invention, the aforementioned memory can be any tangible medium containing or storing a program that can be used or combined with an instruction execution system, apparatus, or device. For example, a computer-readable storage medium can be any suitable magnetic or magneto-optical storage medium, such as Resistive Random Access Memory (RRAM), Dynamic Random Access Memory (DRAM), Static Random Access Memory (SRAM), Enhanced Dynamic Random Access Memory (EDRAM), High-Bandwidth Memory (HBM), Hybrid Memory Cube (HMC), etc., or any other medium that can be used to store desired information and can be accessed by an application, module, or both. Any such computer storage medium can be part of a device or accessible to or connected to a device. Any application or module described in this invention can be implemented using computer-readable / executable instructions that can be stored or otherwise maintained by such a computer-readable medium.

[0058] In the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

[0059] While this specification has shown and described numerous embodiments of the invention, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and essence of the invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in the practice of this invention.

Claims

1. A method for detecting syncope based on an upright tilting bed, characterized in that, include: Obtain the user's basic information and determine the tilt parameters based on the basic information; The basic information includes age, and the tilt parameters include tilt angle; Determining the tilt parameter based on the basic information includes: searching a preset number of cases most similar to the user from a preset case database based on the basic information, wherein the content of the cases includes the angle of syncope occurrence; and determining the tilt angle based on the angle of syncope occurrence. The tilting bed is controlled to tilt based on the tilt parameters to detect syncope, while simultaneously collecting the user's physiological data, including blood pressure. During the syncope detection process, the tilt angle is adjusted according to changes in the physiological data over a specified time. The process also includes acquiring the angle and vibration frequency of the tilting bed; if the change in angle per unit time exceeds a set value, and a signal with a frequency exceeding a set value persists for a specified time, an alarm is triggered to alert the user of a potential fall; the current blood pressure is compared with the blood pressure curve of the most similar case; if the difference in the slope of the blood pressure drop is less than a preset threshold, the duration is extended. Upon completion of the test, a test report is generated based on the physiological data.

2. The syncope detection method based on an upright tilting bed according to claim 1, characterized in that, Determining the tilt angle based on the angle of syncope occurrence includes: determining the tilt angle based on the minimum value among the angles of syncope occurrence, wherein the tilt angle is positively correlated with the minimum value.

3. The syncope detection method based on an upright tilting bed according to claim 1, characterized in that, Collect users' physiological data, including: The angle range is obtained based on the angle at which syncope occurs; In response to the upright tilting bed reaching the angle range, the sampling frequency of the physiological data is increased.

4. The syncope detection method based on an upright tilting bed according to claim 1, characterized in that, Adjusting the tilt angle based on the changes in the physiological data during the maintenance period includes: if the change in the physiological data does not reach a threshold during the maintenance period, then increasing the tilt angle.

5. The syncope detection method based on an upright tilting bed according to claim 4, characterized in that, Before increasing the tilt angle, the method further includes adjusting the maintenance time based on the difference between the user's current physiological data and the physiological data of the most similar case.

6. The syncope detection method based on an upright tilting bed according to claim 1, characterized in that, The process of detecting syncope also includes: For any physiological parameter in the physiological data, the degree of abnormality is obtained based on the difference between the physiological parameter and the corresponding reference baseline; an abnormality score is matched according to the range of the degree of abnormality. The abnormal scores corresponding to each physiological parameter are summed to obtain a comprehensive score; The corresponding syncope treatment strategy is triggered based on the range of the comprehensive score.

7. The syncope detection method based on an upright tilting bed according to claim 1, characterized in that, Also includes: The user's physiological data is collected while maintaining a tilt angle of 0° for a specified time.

8. A syncope detection system based on an upright tilting bed, characterized in that, It includes a processor and a memory, the memory storing computer program instructions, which, when executed by the processor, implement the syncope detection method based on an upright tilting bed according to claims 1-7.

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