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Table 1

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Table 1. Assessment of the resonant frequency and damping coefficient of arterial pressure monitoring systems.

- Start paper trace to make a paper record of the output of the transducer.

- Snap or flick the valve of the continuous flush system or flick the tubing connecting the cannula to the transducer. This will produce an "interference" square-wave on the output trace.

- Repeat the process at least twice.

- Resonant frequency is the paper speed in mm/sec divided by the distance between successive peaks.

- Damping is satisfactory if each snap test has at least 2 oscillation waves and if the ratio of successive amplitudes is 3 or greater.


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