Physical characteristics and clinical evaluation of a new disposable fibreoptic transducer-tipped catheter system

Anaesthesia and Intensive Care
E S BarinS N Hunyor

Abstract

A new disposable fibreoptic transducer-tipped catheter manometer system was evaluated to assess its accuracy, stability of accuracy under prolonged simulated intra-arterial conditions, and dynamic characteristics. Maximum errors observed in the measurement of static pressure using a sample of five catheters (with one display unit) were 2 mmHg at 0 mmHg reference pressure, 2 at 20 mmHg, 4 at 40 mmHg, 4 at 100 mmHg and 9 at 200 mmHg. An immersion artifact caused a shift in baseline of up to 2 mmHg. Exposure of the transducer to 24 hours of simulated intra-arterial conditions (pulsatile pressure at 40 degrees C) resulted in errors of up to 7 mmHg for pressures up to 100 mmHg, and 11 mmHg for 200 mmHg, which were largely attributable to a drift in baseline pressure (up 6 mmHg by 24 hours). Consistent overestimation by the system suggested inappropriate gain setting within the display unit which, however, is not user-adjustable. The system exhibited uniform frequency response up to 33 Hz.

References

Jan 1, 1978·Anesthesia and Analgesia·F FoxT H Gilleland
Aug 1, 1970·American Heart Journal·G G Shapiro, L J Krovetz
Dec 1, 1970·Journal of Applied Physiology·R M GardnerW D Gaisford
Jan 1, 1971·Cardiovascular Research·B J GershC Prys-Roberts
Nov 1, 1981·Anaesthesia and Intensive Care·W B RuncimanA H Ilsley

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Citations

Jan 1, 1992·Journal of Clinical Monitoring·D J Doyle, P W Mark
Apr 1, 1988·Journal of Neurosurgery·J Piek

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