Abstract 14155: The Wavelet Transform of Pulse Wave and Electrocardiogram Improves Accuracy of Blood Pressure Estimation in Cuffless Blood Pressure Measurement
Introduction: Cuffless blood pressure (BP) measurement has several advantages over the conventional cuff-type BP measurement. One of these advantages is monitoring BP without causing the patient any pain. Currently, most of the cuffless BP apparatus utilize only pulse transit time (PTT) to estimate BP; however, this estimation formula showed poor accuracy.
Hypothesis: We hypothesize that the shape of the pulse wave and electrocardiogram contains information related to BP estimation.
Methods: A small sensor module was originally developed, which can be used to measure the pulse wave, electrocardiogram, and PTT, with the sensor being held in both hands by the patient. Data from 127 participants were collected at the University of Fukui Hospital and its affiliated institutions. Each participant provided written informed consent. We also measured BP by using the cuff-type method for reference. In addition to the conventional PTT-based BP estimation algorithm, we added two key components to develop the new estimation equation. These two components are as follows: (a) the information gathered from the wavelet transform of the pulse wave and electrocardiogram and (b) grouping the participants depending on the relationship between the PTT and systolic BP. We used the standard deviation of the difference between the estimated and reference values by using this equation to evaluate the accuracy of this new estimation equation.
Results: The standard deviation of the estimation error of the new estimation equation was 7.63 mmHg, which was better than that of the conventional PTT-based method, at 20.01 mmHg.
Conclusions: Our new BP estimation method using wavelet transform and sample grouping improved accuracy compared with the conventional PTT method. The standard deviation of the error of this new method was less than 8 mmHg, which was the specific requirement set by the International Standard of Non-invasive Sphygmomanometers (ISO 81060-1).
Author Disclosures: S. Yamanaka: None. K. Morikawa: None. O. Yamamura: None. H. Morita: None. J. Huh: None.
- © 2016 by American Heart Association, Inc.