Biological information monitor and method for displaying measurement results in a biological information monitor.

Abstract

To provide a biological information monitor capable of preventing erroneous recognition by a medical worker caused by erroneous impedance respiratory waveform.SOLUTION: A biological information monitor comprises: an OCRG image forming unit which forms an OCRG image having a heart rate waveform trend, an SpO2 trend, and an impedance respiratory waveform aligned therein; a respiration and heart rate synchronization determination unit which determines whether the respiration and the heart rate synchronize with each other; and a display unit which displays in an identifiable manner a section in which the respiration and heart rate synchronization determination unit determines that the respiration and the heart rate synchronize with each other, in the OCRG image formed by the OCRG image forming unit.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a biological information monitor and a method for displaying measurement results in a biological information monitor.

Background Art

[0002] A biological information monitor can collectively display measured values and waveforms of biological information (for example, electrocardiogram, blood pressure, oxygen saturation, etc.) on a display unit. Examples of biological information monitors include bedside monitors set up and used beside beds in hospital rooms and central monitors set up and used in staff stations (also called nurse stations).

[0003] By viewing the measured values and waveforms displayed by the biological information monitor, medical staff (such as doctors and nurses) can grasp the patient's condition. In addition, since a biological information monitor generally has an alarm function that notifies abnormalities by an alarm sound or the like when an abnormality such as an abnormal measured value occurs, medical staff can quickly take appropriate measures in an emergency.

[0004] A biological information monitor having such an alarm function is described in, for example, Patent Document 1.

[0005] There is also a biological information monitor having an impedance respiration measurement function. Impedance respiration measurement is widely used as a device for measuring the respiration of patients for whom it is difficult to measure respiration based on exhaled gas, such as newborns.

[0006] Conventional impedance respiration measurement techniques are disclosed, for example, in Patent Document 2. In impedance respiration measurement, a test signal of, for example, 33 kHz is applied to a pair of electrodes attached to the patient's chest. Based on the detection signal obtained from the electrodes, changes in electrical impedance due to the patient's respiration are detected. In this case, the impedance respiration measurement device extracts the fluctuating component (respiratory waveform) due to respiration by synchronously detecting the respiration detection signal with, for example, a 33 kHz reference signal (detection signal). Based on this fluctuating component, the impedance respiration measurement device measures the patient's respiratory rate, etc.

[0007] Generally, vital signs monitors equipped with impedance respiration measurement capabilities display an OCRG (Oxy Cardio Respiro Graphy) image in which heart rate trends, SpO2 trends, and impedance respiration waveforms are arranged side by side. By viewing the OCRG image, medical professionals such as doctors and nurses can check the number of apneas and the reasons for them, confirm whether the apnea is normal, and, if necessary, take appropriate measures such as changing the patient's position. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2001-070257 [Patent Document 2] Japanese Patent Publication No. 2013-063186 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] Incidentally, while impedance respiration measurement is intended to measure the movement of the rib cage caused by breathing, there is a possibility that the heartbeat, if transmitted to the body surface, may also be measured as being caused by breathing.

[0010] Specifically, if a patient is experiencing apnea, the detected respiratory waveform should be the baseline. However, in cases where the heart is close to the body surface, such as in newborns, the heart's movement may be detected directly as the respiratory waveform, resulting in a waveform that is not the baseline. As a result, there is a risk of obtaining an impedance respiratory waveform that appears as if the patient is breathing, even though they are actually apnea.

[0011] When such impedance respiratory waveforms are output from a vital signs monitor, healthcare professionals may mistakenly perceive that the patient is breathing even when they are experiencing apnea. For example, when counting how many times apnea occurred within a certain period based on OCRG images, they may undercount the actual number of apnea episodes.

[0012] This invention has been made in consideration of the above points, and provides a vital signs monitor and a method for displaying measurement results in a vital signs monitor that can prevent misinterpretation by medical professionals caused by erroneous impedance respiratory waveforms. [Means for solving the problem]

[0013] One embodiment of the biological information monitor of the present invention is: An OCRG (Oxy Cardio Respiro Graphy) image forming unit that arranges heart rate trends, SpO2 trends, and impedance respiratory waveforms side by side, A respiratory-heart rate synchronization determination unit that determines whether or not respiration and heart rate are synchronized, A display unit that displays in the OCRG image formed by the OCRG image forming unit the interval in which the respiration and heart rate synchronization determination unit has determined to be synchronized, It is equipped with.

[0014] One embodiment of the method for displaying measurement results in the biological information monitor of the present invention is A step of forming an OCRG (Oxy Cardio Respiro Graphy) image in which a heart rate trend, a SpO2 trend, and an impedance respiratory waveform are arranged side by side. A determination step of determining whether respiration and heart rate are synchronized. A step of visibly displaying an interval determined to have synchronized respiration and heart rate by the determination step in the OCRG image. It includes.

Advantages of the Invention

[0015] According to the present invention, since an interval determined to have synchronized respiration and heart rate by a respiration-heart rate synchronization determination unit is visibly displayed in an OCRG image, misrecognition by medical staff due to an incorrect impedance respiratory waveform can be prevented.

Brief Description of the Drawings

[0016] [Figure 1] Perspective view showing the external configuration of the biological information monitor according to the embodiment [Figure 2] Block diagram showing the configuration of the biological information monitor of the embodiment [Figure 3] Diagram showing an example of an image when there is no apnea interval [Figure 4] Diagram showing an example where an apnea interval exists and a baseline due to apnea clearly appears in the impedance respiratory waveform [Figure 5] Diagram showing an example of a display image according to the present embodiment [Figure 6] Diagram showing an example of a setting image for setting ON / OFF of alarm display

Modes for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0018] FIG. 1 is a perspective view showing the external configuration of the biological information monitor 10 according to the present embodiment.

[0019] The biological information monitor 10 has a display unit 101 on its front. Additionally, a standby switch 11 and an alarm indicator 12 are provided on the front of the biological information monitor 10.

[0020] One side of the vital signs monitor 10 is provided with a group of connectors related to the measurement of vital signs. Specifically, it includes an ECG (Electrocardiogram) connector 13a, an NIBP (Non-Invasive Blood Pressure) connector 13b, and an SpO2 connector 13c. Below the group of connectors, there is an additional module connection section 14 to which an additional module for implementing optional vital signs measurement processing can be attached. Incidentally, the other side of the vital signs monitor 10 (not shown) is provided with a USB connector, a LAN connection connector, and a recorder.

[0021] Figure 2 is a block diagram showing the configuration of the vital signs monitor 10. The vital signs monitor 10 is connected via a connector section 110 to vital signs detection units, including an electrocardiogram electrode 111 for detecting an electrocardiogram, a blood pressure measurement cuff 112 for detecting blood pressure, a body temperature sensor 113 for detecting body temperature, an SpO2 sensor 114 for detecting SpO2, and a cardiac output sensor 115 for detecting cardiac output. The connector section 110 functions as an interface between the vital signs detection units and the measurement processing unit 104. The connector section 110 includes the ECG connector 13a, NIBP connector 13b, and SpO2 connector 13c shown in Figure 1.

[0022] The measurement processing unit 104 executes a predetermined measurement process by running a program stored in the memory unit 105. Through this measurement process, the measurement processing unit 104 measures the patient's biological information using the biological information detection unit (electrocardiogram electrodes 111, blood pressure measurement cuff 112, body temperature sensor 113, SpO2 sensor 114, and cardiac output sensor 115) connected to the connector unit 110. Since conventionally known methods can be applied to the measurement of various biological information using the above-mentioned biological information detection unit, a detailed explanation thereof is omitted here.

[0023] Furthermore, the measurement processing unit 104 is capable of storing previously measured biological information in the storage unit 105, and reading biological information stored in the storage unit 105. In addition, the biological information obtained by the measurement processing unit 104 is displayed on the display unit 101 in the form of measured values ​​or waveforms via the display control unit 102.

[0024] The display unit 101 is, for example, a liquid crystal display with a touch panel, and not only has a display function to display biometric information, but also functions as an input unit to accept user input operations. Specifically, the display control unit 102 changes the display on the display unit 101 and the processing of the measurement processing unit 104 based on the user's touch operation of the display unit 101. In this embodiment, user operations such as various settings are accepted by touch operation of the display unit 101, but user operations may also be accepted using, for example, a keyboard, mouse, or dedicated buttons.

[0025] Furthermore, the measurement processing unit 104 includes an impedance respiration measurement unit 104-1. The impedance respiration measurement unit 104-1 measures the subject's respiration based on impedance changes detected by the electrocardiogram electrodes 111. The measurement process by the impedance respiration measurement unit 104-1 can be implemented using known techniques described in Patent Document 2, etc., so a detailed explanation is omitted here.

[0026] In addition to the above configuration, the biological information monitor 10 of this embodiment includes an OCRG image forming unit 120 and a respiratory-heart rate synchronization determination unit 130.

[0027] The OCRG image forming unit 120 receives biological information from the measurement processing unit 104 and forms an OCRG (Oxy Cardio Respiro Graphy) image in which the heart rate trend, SpO2 trend, and impedance respiratory waveform are arranged side by side.

[0028] The OCRG image formed by the OCRG image forming unit 120 is displayed on the display unit 101 via the display control unit 102. By viewing the displayed OCRG image, medical professionals can check the number of apneas and the reasons for the apneas, confirm whether the apnea is normal, and, if necessary, take appropriate action such as changing the patient's position.

[0029] The respiration-heart rate synchronization determination unit 130 receives biological information from the measurement processing unit 104 and determines whether or not respiration and heart rate are synchronized. Specifically, the respiration-heart rate synchronization determination unit 130 determines that respiration and heart rate are synchronized if the heart rate waveform overlaps with the impedance respiration waveform in the time direction, the number of breaths based on the impedance respiration waveform is a predetermined number (e.g., 30 Bpm) or more, and the time during which the heart rate based on the heart rate waveform and the number of breaths based on the impedance respiration waveform are synchronized is a predetermined time (e.g., 20 seconds) or more. In this embodiment, the interval in which respiration and heart rate are determined to be synchronized is called the CVA (Cardio-vascular Artifact) interval.

[0030] The fact that respiration and heart rate are synchronized here means that the respiration obtained by impedance respiration measurement is likely to be due to the heartbeat. In other words, it is highly likely that the measurement results will be inaccurate, indicating that the patient is breathing even though they are actually apnea.

[0031] The determination result obtained by the respiratory-heart rate synchronization determination unit 130 is displayed on the display unit 101 via the display control unit 102.

[0032] Figures 3-6 show examples of display images of biological information according to this embodiment.

[0033] As shown in Figure 3, the display unit 101 displays a real-time measurement image G1 consisting of real-time waveforms and measured values. In addition, an OCRG image G10 is superimposed on a portion of the real-time measurement image G1. Within the OCRG image G10, the heart rate trend G11, the SpO2 trend G12, and the impedance respiratory waveform G13 are arranged side by side.

[0034] Figure 3 shows an example image where no apnea intervals are present. Healthcare professionals can confirm the absence of apnea intervals from the impedance respiratory waveform (RESP) G13 within the OCRG image G10.

[0035] Figure 4 shows an example image where an apnea interval is present. More specifically, Figure 4 shows an example where an apnea interval is present and a baseline due to apnea is clearly visible in the impedance respiratory waveform. Healthcare professionals recognize the interval corresponding to the baseline G20 in the impedance respiratory waveform (RESP) G13 within the OCRG image G10 as an apnea interval.

[0036] On the other hand, Figure 5 shows an example image where, despite the actual presence of apnea, the impedance respiratory waveform (RESP) G13 in the OCRG image G10 does not show the apnea as a baseline due to the influence of the heartbeat. In this case, healthcare professionals may mistakenly perceive that the patient is breathing even when they are apneic. As a result, when counting the number of apnea episodes, they may undercount the number of apnea episodes.

[0037] However, as can be seen from Figure 5, in this embodiment, the respiratory-heart-rate synchronization determination unit 130 displays the CVA interval, which is the interval in which respiration and heart rate are determined to be synchronized, in an identifiable manner in the OCRG image G10. As a result, even if the impedance respiratory waveform is not the baseline, medical professionals can recognize that the position is an apnea interval. Consequently, even when the heart rate component is superimposed on the impedance respiratory waveform, it is prevented that the number of apneas will be counted less than the actual number.

[0038] Incidentally, in Figure 5, the start position of the CVA interval is delayed compared to the start position of the apnea interval because, as described above, the determination algorithm of the respiratory-heart rate synchronization determination unit 130 in this embodiment determines that respiration and heart rate are synchronized if the time during which the heart rate based on the heart rate waveform and the respiratory rate based on the impedance respiratory waveform are synchronized is predetermined (for example, 20 seconds) or longer. In other words, in this embodiment, the start position of the CVA interval is predetermined (for example, 20 seconds) after the start position of the apnea interval.

[0039] In the example shown in Figure 5, the CVA interval is displayed in an identifiable manner by color-coding the time domain corresponding to the CVA interval in a band-like manner. However, the present invention is not limited to this, and essentially, it is sufficient to display the CVA interval in an identifiable manner. For example, the CVA interval may be displayed in an identifiable manner by color-coding the impedance breathing waveform corresponding to the CVA interval.

[0040] figure 6 This diagram shows an example of a setting image for turning the CVA interval display ON / OFF. Healthcare professionals can turn the CVA interval display ON / OFF by touching the CVA display ON / OFF button G30.

[0041] As described above, according to this embodiment, by providing an OCRG image forming unit 120 that forms an OCRG image G10 in which a heart rate trend, an SpO2 trend, and an impedance respiratory waveform are arranged side by side, a respiratory-heart rate synchronization determination unit 130 that determines whether or not respiration and heart rate are synchronized, and a display unit 101 that displays in an identifiable manner the interval in the OCRG image G10 formed by the OCRG image forming unit 120 in which the respiratory-heart rate synchronization determination unit 130 determines that respiration and heart rate are synchronized, it is possible to prevent misrecognition by medical professionals caused by an incorrect impedance respiratory waveform.

[0042] The embodiments described above are merely examples of how the present invention can be implemented, and the technical scope of the present invention should not be limited by them. In other words, the present invention can be implemented in various ways without departing from its gist or its main features. [Industrial applicability]

[0043] This invention is suitable for a biological information monitor having an impedance respiration measurement function. [Explanation of Symbols]

[0044] 10. Biometric Information Monitor 101 Display section 102 Display Control Unit 103 Alarm Indicator 104 Measurement Processing Unit 104-1 Impedance Respiratory Measurement Unit 105 Storage section 110 Connector section 120 OCRG Image Forming Unit 130 Respiratory-heart-rate synchronization determination unit G1 Real-time measurement image G10 OCRG image G11 Heart rate waveform G12 SpO2 waveform G13 Impedance breathing waveform

Claims

1. An OxycardioRespiroGraphy (OCRG) image forming unit that forms an OxycardioRespiroGraphy (OCRG) image in which heart rate trends, SpO2 trends, and impedance respiratory waveforms are arranged side by side, A respiratory-heart rate synchronization determination unit that determines whether or not respiration and heart rate are synchronized, A display unit that displays in the OCRG image formed by the OCRG image forming unit the interval in which the respiration and heart rate synchronization determination unit has determined to be synchronized, Equipped with, The respiratory-heart rate synchronization determination unit determines that respiration and heart rate are synchronized if the number of respirations based on the impedance respiratory waveform is equal to or greater than a predetermined number, and the time during which the heart rate based on the heart rate trend and the number of respirations based on the impedance respiratory waveform are synchronized is equal to or greater than a predetermined time. Biological information monitor.

2. The respiratory-heart rate synchronization determination unit determines whether or not respiration and heart rate are synchronized based on respiratory rate and heart rate. A biological information monitor according to claim 1.

3. The display unit displays the interval in which the respiration and heart rate are determined to be synchronized by the respiration-heart rate synchronization determination unit in the impedance respiration waveform display area. A biological information monitor according to claim 1 or 2.

4. The steps include forming an OxycardioRespiroGraphy (OCRG) image in which the heart rate trend, SpO2 trend, and impedance respiratory waveform are arranged side by side, A determination step to determine whether breathing and heart rate are synchronized, The step includes displaying in the aforementioned OCRG image the interval in which the determination step determined that respiration and heart rate were synchronized, in an identifiable manner. In the determination step, if the number of breaths based on the impedance breathing waveform is greater than or equal to a predetermined number, and the time during which the heart rate based on the heart rate trend and the number of breaths based on the impedance breathing waveform are synchronized is greater than or equal to a predetermined time, then it is determined that breathing and heart rate are synchronized. Method for displaying measurement results in a biological information monitor.

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