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Which type of transducer is commonly used for invasive blood pressure measurement?

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Which type of transducer is commonly used for invasive blood pressure measurement?

(a) Capacitive

(b) Rheostatic

(c) Piezoelectric

(d) Potentiometric

This question was addressed to me in an international level competition.

The above asked question is from Measuring Blood Pressure & Pulse Oximetry in portion Diagnostic Investigation in Neurology and Cardiology of Clinical Science

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Correct answer is (c) Piezoelectric

Easy explanation: A Piezoelectric transducer converts the applied mechanical pressure into electrical pressure. Thus, the exerted blood pressure is converted into electrical impulses by the piezoelectric crystals which are amplified and recorded by the systems.

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