Anaesthesia
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Letter Case Reports
Advantages and disadvantages of the Arrow FlexTip Plus epidural catheter.
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Letter Case Reports
Failed epidural in an obese patient--blame it on Pythagoras!
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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. ⋯ Subtraction of the venous outflow reveals the underlying arterial flow waveform. The assumptions on which the method is based are stated explicitly and discussed.