Abstract
Continuous blood pressure monitoring is essential to prevent and cure cardiovascular diseases (CVDs). Using pulse transit time (PTT) is a well-known potential approach for continuous blood pressure measurement. PTT can be easily obtained from electrocardiogram (ECG) and photoplethysmography (PPG). This method is convenient and comfortable because it is cuffless and noninvasive. However, the precision of systolic blood pressure (SBP) measurement via PTT is low until now and the relativity of SBP with PTT needs to be improved. The goal of this paper is to improve the accuracy of SBP measurement via PTT. Three key proposals are provided to achieve this target. Band-pass filter and wavelet denoising in series are applied to remove noise on ECG. A new characteristic point on ECG is introduced as the starting point of pulse arrival time (PAT) to replace the R-peak of ECG. And pre-ejection period (PEP) is estimated using heart rate (HR) to compute PTT. Our experiment shows that the accuracy is improved by 8.4% in average, compared to ordinary method.
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