Optimal Damping Coefficient — FRCA Primary MCQ

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HardPhysics & Clinical MeasurementOptimal Damping CoefficientFRCA Primary

A fast-flush test produces a single overshoot followed by small oscillations that rapidly decay to baseline. Which damping coefficient most closely represents the usual compromise between speed and overshoot?

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Correct answer: E — 0.64

The best answer is “0.64”. A damping coefficient near 0.64 gives a rapid response with limited overshoot and is commonly regarded as optimal for invasive pressure monitoring. Lower values produce underdamped ringing and systolic exaggeration. Critical or overdamped responses are slower and attenuate waveform detail even if mean pressure may remain usable.

Reference: Fujiwara et al., Effect of Planecta and ROSE on the frequency characteristics of blood pressure-transducer kits: https://pmc.ncbi.nlm.nih.gov/articles/PMC4621715/