Cuff-Less Estimation of Blood Pressure Using Pulse Transit Time and Pre-ejection Period

Non-invasive and cuff-less measurement of arterial blood pressure (BP) is desirable for continuous patient monitoring. Among the various possible techniques pulse transit time (PTT) based approach for estimation of BP is the most promising one. But change in BP is reflected both in PTT and pre-ejection period (PEP). We propose to measure PTT using multiple PPG and PPG-ECG combination recorded at two different sites along the same artery and argue that this approach will eliminate a number of assumptions like constant PEP, involved in the most common method of measuring PTT using QRS complex as timing reference. This approach can help in finding an appropriate BP calibration methodology since true PTT can be measured by this technique.