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Improved noninvasive determination of blood pressure by oscillometry in the presence of motion artifacts

University of British Columbia

Blood pressure measurements provide information regarding the status of the cardiovascular system to aid in diagnosing pathological conditions, maintaining patient stability during surgery, and adapting tourniquet pressures. However, the performance of commercially available techniques of measuring blood pressure is often degraded during clinical measurements in the presence of motion artifacts. A prototype system based on oscillometry that uses algorithms which take advantage of a multi-bladder cuff has the potential to improve measurements of blood pressure in noisy environments by detecting noise and rapidly estimating blood pressure using only data uncorrupted by noise. This system and strategy, implemented in one version to track limb occlusion pressure (the minimum cuff pressure required to occlude underlying arteries), was evaluated along with a typical commercial, JLV available oscillometric blood pressure monitor to compare their ability to track limb occlusion pressure in the presence of varying noise conditions encountered during lab trials and clinical trials. Results showed that the prototype consistently estimated limb occlusion pressure more rapidly, more accurately, and more reliably than the oscillometric monitor in noise conditions typical of surgical procedures. The results also indicate that the prototype is feasible for incorporation into an adaptive tourniquet.

Text

2010-07-08

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http://hdl.handle.net/2429/26218

Electrical and Computer Engineering

University of British Columbia

Graduate