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Which principle is used by ear oximeter usually?

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Which principle is used by ear oximeter usually?

(a) in vivo

(b) transmission

(c) reflection

(d) in vitro

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This question is from Vectorcardiography (VCG) topic in portion Biomedical Recorders of Biomedical Instrumentation

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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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