Direct Blood Pressure Measurement —Dynamic Response Requirements

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Abstract
Optimum dynamic response is required if systolic and diastolic pressures are to be measured accurately. If mean pressure is the only measurement required dynamic response characteristics are of little importance. With increasing use of derived variables, such as rate-pressure product, it is important that correct pressures be measured. A system with inadequate dynamic response, whether underdamped or overdamped, will result in an error in systolic pressure. The systolic pressure from an underdamped system will be overestimated and the systolic pressure from an overdamped system will be underestimated. Diastolic pressure is affected, but is more tolerant of dynamic response inadequacies. If invasive pressure monitoring systems are used, with their attendant risk of complication to the patient, great care should be taken to obtain accurate and reliable data. Simply locking at the waveform does not provide sufficient information to determine adequacy of dynamic response. Requirements for adequate system dynamic response are outlined, methods for clinical testing are given and a device for optimizing dynamic response is presented.

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