Sun28November0333PM 43

Which of the following is true when testing a transducer-catheter system used for the measurement of pressures?

True / False

Tubing used for connecting cannula to transducer should be long and narrow Correct

Frequency response should be five times the fundamental frequency Correct

Optimal damping is about 0.8 of critical Correct

Application of a square wave pressure signal is a method of assessment Correct

Mean pressures are unaffected by damping Correct

Explanation

Application of a square wave signal to the pressure transducer is used to calibrate the system.

The frequency response should be ten times the fundamental frequency.

Damping and resonance alter systolic and diastolic pressures leaving the mean pressure unaffected.

An optimal damping factor is between 0.6 and 0.7. The arterial waveform is sufficiently damped to allow slight overshoot.

The tubing used to conduct the pulsatile fluid movement from the tip of the cannula to the transducer system ideally should be stiff, non-pliant, less than 120 cm in length and of a 'large' diameter.

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