|Blood pressure in the circulatory system alternates between systolic pressure (maximum) and diastolic pressure (minimum) with each heartbeat. A sphygmomanometer, a cuff placed around the upper arm to cut off blood flow in the arteries, measures these pressures. As pressure is released from the cuff, a whooshing sound is heard when blood starts to flow in the artery (systolic). As pressure is further released from the cuff, sound ceases when blood flow returns to normal (diastolic).
These measurements are used with an algorithm to determine the systolic and diastolic pressure in the arteries. This algorithm relies on the amplitude of the oscillations measured; therefore, it is pressure dependent, reducing the accuracy of the readings.
Researchers at Purdue University have developed a new set of algorithms for calculating systolic and diastolic pressures. These algorithms use the mean pressure instead of the maximum oscillation amplitude to provide more accurate results than current oscillometric devices.
-Minimal modification to existing devices
-Improved accuracy of the readings
Jun 24, 2004
Mar 21, 2006
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