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Noninvasive method for determining blood pressure and contours of arterial and volume pulses

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DOI: 10.4236/jbise.2008.12013    5,304 Downloads   10,041 Views Citations
Author(s)
K. Razi Naqvi, Luca Parigi, Camer W. Vellani, Santosh Kumar

Affiliation(s)

Department of Physics, Norwegian University of Science and Technology.
The Aga Khan University.

ABSTRACT

A noninvasive method for monitoring blood pressure, based on the principles established by Riva-Rocci and Korotkoff (K), is described; it furnishes, after a single compression-deflation cycle of the arm-encircling cuff, values of sys-tolic and diastolic blood pressures as well as the contours of the brachial arterial pulse and the corresponding volume pulse. K-sounds are detected by a single microphone situated in the cubital fossa, and the time-varying cuff pressure P(t) is read by a piezoresistive pressure sensor. The behavior of P(t) during deflation is resolved into two parts, P(t)=p(t)+b(t); p is a train of posi-tive going pulses (arising from arterial pulsa-tions), whereas b is a slowly changing baseline. Noise pulses in the microphone output are re-jected by using the observation that the first few K-sounds are emitted when p is close to a maxi-mum, and the last few when dp/dt is close to a maximum. The performance of the instrument is illustrated by showing how it copes with ambi-ent noise and involuntary manual perturbations of P, and by presenting contours of various pulses.

KEYWORDS

Blood pressure, oscillometry, brachial pulse wave analysis

Cite this paper

Naqvi, K. , Parigi, L. , Vellani, C. and Kumar, S. (2008) Noninvasive method for determining blood pressure and contours of arterial and volume pulses. Journal of Biomedical Science and Engineering, 1, 79-84. doi: 10.4236/jbise.2008.12013.
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