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Which principle is used by ear oximeter usually?(a) in vivo(b) transmission(c) reflection(d) in vitroThis question was addressed to me in an online quiz.This question is from Vectorcardiography (VCG) topic in portion Biomedical Recorders of Biomedical Instrumentation

Answer»

The correct ANSWER is (B) transmission

Easiest explanation: Ear oximeters usually make use of the transmission principle to measure ARTERIAL oxygen saturation. In this case, the pinna of the ear acts as a cuvette. BLOOD in the ear MUST be made similar to arterial blood in composition.



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