Cuffless BP Measurement Using Single Site Photoplethysmography

Abstract

In this work, a blood flow-based method has been proposed to estimate beat to beat blood pressure parameters from the photoplethysmography (PPG) signal from a single PPG sensor. PPG signal represents the changes in the blood volume. The first derivative of it reflects the blood flow rate. In this work, the features are extracted from the blood flow rate reflected by the first derivative of PPG signal. The proposed method has been validated using Clinical data available in MIMIC II database. The validation shows that the systolic blood pressure and diastolic blood pressure estimated from a single site PPG signal has the mean error ± SD as 0.95 ± 5.14 mmHg for the beat-to-beat Pulse Pressure (PP) and 0.402 ± 4.85 mmHg for beat-to-beat Systolic Blood Pressure (SBP).