Continuous systolic pressure measurement based on analysis of photoplethysmogram
Date Issued
2004
Date
2004
Author(s)
Wang, Hsiang-yao
DOI
zh-TW
Abstract
Due to the measurement result, the method of measuring blood pressure is divided into two: continuous and non-continuous. The continuous blood pressure contains the systolic and diastolic pressure with every heartbeat. For the non-continuous measurement uses algorithm to get the blood pressure during a period of time. It also requires cuff as an auxiliary. Furthermore, the blood pressure of a severe diseased patient may change rapidly in a very short time. For long term monitoring, continuous blood pressure measurement is very crucial for certain patients as one of the important vital signs. This requirement is most commonly met by the placement of an intra arterial catheter. It not only needs the professional staffs to set up, but also brings problems like thrombosis and infection.
The aim of our study is to use the relation between photoplethysmogram(PPG) and systolic blood pressure to build a noninvasive method which can obtain the continuous blood pressure variation. In addition to the comparison of the different estimation methods, we also use the combination of PPG and cuff to get systolic pressure measurement as a rectification to the estimation equation. It can reduce the risk and inconvenience of the invasive method.
According to the results, the continuous systolic pressure can be estimated well by two parameters: one is duration of the peak of R wave to the beginning of the up-slope of the PPG wave(arrival time); the other is the time of the pulse width of PPG. The outcome of using PPG to determine the systolic pressure is the same as oscillometry. Finally, Chen’s method seems to get a better result when we use the systolic pressure determined by PPG as a rectification. As the measurement result of two patients, the mean difference of 0.27mmHg with a standard deviation of 9.04mmHg. In the future, we will measure more patients to verify our results and extend the time of each measurement. We hope that we can also obtain the diastolic pressure to achieve the completely noninvasive continuous blood pressure measurement.
Subjects
光體積變化描述波形
連續收縮壓
非侵入式
Continuous systolic pressure
photoplethysmogram
noninvasive
Type
thesis
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