Multi-Wavelength PPG Amplitude Ratio Features for Cuffless Blood Pressure Estimation: An Exploratory Study
Background: Cuffless blood pressure (BP) estimation from photoplethysmography (PPG) remains challenging. This exploratory study investigated whether curvature-derived waveform features from multiple PPG wavelengths, particularly amplitude ratios, are associated with cuff-based BP readings. Methods: Red, infrared, and g...