Photoplethysmography for an independent measure of pulsatile pressure under controlled flow conditions.Noninvasive continuous blood pressure measurements are desirable for patients and clinicians.  This work proposes and validates a method for transmural pressure measurement using photoplethysmography (PPG) in an in vitro setup that allows control of pressure and flow conditions. 
photoplethysmography
This work proposes and validates a method for transmural pressure measurement using photoplethysmography (PPG) in an in vitro setup that allows control of pressure and flow conditions.  Pressure, red (R) and infrared (IR) PPG signals were recorded continuously in two arterial models with different cross-sectional areas (Model 1 and Model 2) utilising a pulsatile pump. 
PPG