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New devices offering continuous, noninvasive arterial pressure monitoring compare favorably with intermittent, automated cuff measurement (NEJM JW Emerg Med Mar 11 2014), but how do they compare with invasive measurement? One such device, the Nexfin®, adjusts pressure in a finger cuff 1000 times per second to maintain a constant arterial volume throughout the cardiac cycle, allowing measurement of an arterial pressure waveform.
Researchers compared readings from the Nexfin device and traditional arm cuff oscillometry with readings from continuous invasive arterial pressure monitoring in 112 patients undergoing elective surgery. In each patient, pressures were measured during a 30-minute hemodynamically stable period. The median difference in…