Development of a Continuous Blood Pressure Assessment System by PPG Waveform Techniques

Abstract

Blood pressure (BP) can be used as an index to determine cardiovascular health and stability of life However measuring BP accurately often necessitates the use of invasive clinical procedures that may lead to vascular thrombosis and infection Although commercial sphygmomanometers do not bear risks of vascular thrombosis and infection they cannot be used to measure BP continuously Thus to exploit the advantages of both invasive and non-invasive methods we developed a continuous non-invasive BP assessment system To construct an algorithm for estimating BP regression analyses of characteristic parameters in photoplethysmography (PPG) using the Nellcor OxiMax N-600x instrument and BP measured using the OMRON MX-3 instrument were used; PPG parameters were then substituted into this algorithm In addition the estimated BP was correlated with the accurately measured BP The results indicate that PPG parameters are closely related to vascular effects and are highly correlated with diastolic BP (DBP) and mean BP (MBP) Therefore MBP was used as an index in the system However MBP was more accurately estimated using combinations of measurements made at shoulder flexion angles of 0? 90? and 180? Thus we conclude that the current continuous non-invasive BP assessment system using PPG parameters is clinically feasible

Date of Award	2016 Aug 4
Original language	English
Supervisor	Tainsong Chen (Supervisor)