Blood Pressure Estimation Using Optical Technique and Surface Fitting

Blood pressure (BP) is a crucial vital sign of human health. Many methods have been developed for measuring blood pressure either invasive or noninvasive which attracts the attention of researchers. Recently a lot of researches and techniques have been done to find a relationship between the Pulse Transit Time (PTT) and both Systolic Blood Pressure (SBP) and Diastolic Blood Pressure (DBP). This paper proposed a system that focuses on estimating blood pressure utilizing the optical technique. Statistical features are extracted from PTT which are calculated using the Photoplethysmogram (PPG) and Electrocardiogram (ECG) signals. A surface fitting between these features and the SBP and DBP is done. The results show that the system achieves a Mean Absolute Error (MAE) of 4.13 and 6.89 for SBP and DBP respectively and Absolute Error (AE) of 3.77% and 5.76% for SBP and DBP respectively.