Noninvasive and cuff free blood pressure measurement for telemedicine [translation]

Non invasive for telemedicine 、 Cuff free blood pressure measurement

Abstract

- This paper presents a new method of noninvasive blood pressure reading in telemedicine . Through pulse transmission time technology , ECG can be used (ECG) And light plethysmography (PPG) Between the time interval to predict systolic blood pressure 、 Diastolic blood pressure and mean blood pressure . Then these data can be transmitted to the Internet for analysis and viewing . Wireless application protocol (WAP) For displaying information on portable wireless devices . therefore , The cardiovascular status of subjects can be used for monitoring or pre diagnosis purposes

brief introduction

Measure blood pressure regularly (BP) be necessary , To observe the patient's cardiovascular status in a predetermined period . Changes in blood pressure can provide important information about the patient's condition . It is of great significance to realize the remote non-invasive measurement of blood pressure information through telemedicine technology .

The traditional non-invasive blood pressure measurement technology is due to the periodic inflation and inflation of the cuff , It is not suitable to obtain continuous blood pressure . Frequent arterial occlusion can also cause measurement errors . lately , An improved method based on pulse transmission time (PIT) Cufflink free technology is used to predict BP[11].

BP It can be determined by the pulse wave velocity (PWV) determine ,PWV yes PTT Inverse equation of , from Bramwell and Hill [2]
$$c^2=\Delta pV/\Delta v\rho$$
In style c = PWV rice / second , Δp = Pressure change ,Δv = Volume change ,v = Initial volume ,p = Fluid density . This means higher BP Corresponding to shorter PTT, vice versa . This technology is non-invasive , Easy to implement .

The data obtained through this technology can be uploaded to the Internet for remote access and analysis . The integration of mobile phone and computer network technology is a trend of telecommunications and telemedicine . And wireless application protocol (WAP) The emergence of compatible devices is an example . This paper will propose a method based on wap Non invasive arterial blood pressure remote measurement system .

Method

ECG and PPG The signal is obtained by the laboratory physiological measurement system , The computer passes by 1500Hz Sampling frequency of ADC Record . meanwhile , Blood pressure is obtained by a standard sphygmomanometer calibrated with oscilloscope method

PTT The principle of blood pressure measurement with this method is shown in Figure 1. Because blood pressure changes with every heartbeat , We use continuous 5 Time ECG-pulse Interval to get PPT Average [3].

chart 1: At intervals T As an indicator of blood pressure

After initial correction , Get the regression curve of each subject . This line is between blood pressure and PTT A linear function is formed between ( chart 2), When P’IT Input into function , You can calculate the corresponding blood pressure value .

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chart 2:PTT Regression line with blood pressure .