Estimation of blood pressure using Photoplethysmography on the wrist

Blood pressure measuring method using PPG signal is the one of many non-invasive blood pressure methods. In this study, we have studied a new method that estimates the blood pressure using wrist cuff and wrist PPG (photoplethysmograph) signal. During the deflation of the wrist cuff pressure, the PPG pulse appears at certain point that is similar to Korotkoff sound. After the pulse appeared, the morphology of PPG pulses was changed into the certain shape. So, we use these points to estimate the blood pressure. For validation, the reference SBP and DBP are measured by auscultatory method at the left upper arm. Subjects were 13 non cardiac disease of man in their twenties. The result of this study, the mean difference of SBP and DBP, between auscultatory method and PPG analysis is 2.08 ± 5.07 mmHg and 1.38 ± 7.86 mmHg respectively.