Comparison of Features by Simultaneous Measurement of Blood Pressure Pulse Wave and Electrocardiogram.

In this study, we report features related between an electrocardiogram (ECG) and a blood pressure pulse wave measured by the fabricated wearable device. The device consists of MEMS 3-axis force sensors, an electrocardiograph, a signal processing board and a fixed band. This device measures blood pressure using force sensors that are placed on the surface of the skin over a blood vessel. During experimentation, blood pressure was varied by breath holding while simultaneously measuring the blood pressure pulse wave and the ECG. Furthermore, features derived from the blood pressure pulse wave, its differential waveforms, such as the acceleration pulse wave, and the ECG were compared. The correlation coefficient between the pulse pressure of the blood pressure pulse wave and the P wave amplitude of the ECG associated with hypertension was 0.976. Moreover, the correlation coefficient between the augmentation index of the blood pressure pulse wave and the ST segment elevation of the ECG, which is used for diagnosis of myocardial infarction, was 0.915.