Extracting arterial flow waveforms from pulse oximeter waveforms apparatus.
A method is described which allows an approximation to the arterial flow waveform to be derived from a pulse oximeter waveform. The observed pulse oximeter waveform is the sum of arterial inflow and venous outflow. These components are separated mathematically. Subtraction of the venous outflow reveals the underlying arterial flow waveform. The assumptions on which the method is based are stated explicitly and discussed.
Cook
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Consultant Anaesthetist, Department of Anaesthesia, Royal Oldham Hospital, Rochdale Road, Oldham OL1 2JH, UK.
D000465:Algorithms; D001158:Arteries / Q000502:physiology*; D001160:Arterioles / Q000502:physiology; D006801:Humans; D016343:Monitoring, Intraoperative / Q000379:methods*; D010092:Oximetry / Q000379:methods*; D012815:Signal Processing, Computer-Assisted