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Comparison of plethysmographic and electromagnetic flow measurements

The influence of plethysmographic congesting pressures on blood flow has been studied in anaesthetized mongrel dogs and primates. The flow was measured simultaneously with a plethysmograph and with an electromagnetic flowmeter and the results are compared with electromagnetic measurements just before occlusion. In the case of complete venous obstruction, the plethysmographic flow values are equal to the electromagnetic flow values during occlusion but smaller than the electromagnetically measured values before occlusion. The maximum flow measured with the plethysmograph was about 80% of the undisturbed flow for the dogs and about 92% of that for the primates.