Abstract
Recently, clinically implantable rotary blood pumps made it possible to support patients for extended time periods in full mobility, without the necessity of any invasive catheters. However, low pulsatility of arterial blood pressure, compromises determination of this important parameter by the classical Riva-Rocci cuff pressure-method:. Therefore, the Riva-Rocci blood pressure measurement was modified using an Ultrasound Doppler flowmeter instead of a microphone to determine the pinch-off point of peripheral flow. A continuous wave Doppler-flowmeter (Huntleigh® DopplerII) with a bidirectional data display was used. Comparisons with invasive measurement showed good agreement, with the doppler-determined values below below the systolic value of invasive monitoring. Depending on pulsatility ratio a difference of less than 5 to 10mmHg was observed. To allow single-hand use of the equipment, the ultrasound sensor can be mounted on a guiding splint for proper positioning above the radial artery. It is concluded that this method allows reliable, noninvasive determination of arterial pressure in daily routine of rotary-pump assisted patients.
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