Frequency response of fluid-filled catheter-micromanometer systems used for measurement of left ventricular pressure.
The resonant frequencies of five commonly used fluid-filled catheters connected to a solidstate microdisplacement pressure gauge were 18 to 33 per cent higher than those obtained with a conventional manometer.  Four catheters had a flat amplitude response to 26 Hz. or more at the 20 per cent amplitude distortion level.  The dynamic response characteristic of certain fluid-filled catheters used with microdisplacement pressure gauges allows one to record high fidelity left ventricular pressure curves.
D000669:Amplifiers, Electronic; D006328:Cardiac Catheterization / Q000295:instrumentation* / Q000592:standards; D004582:Electronics, Medical / Q000295:instrumentation; D005069:Evaluation Studies as Topic; D006801:Humans; D008365:Manometry / Q000295:instrumentation* / Q000592:standards