Mathematical Modeling of Noninvasive Blood Pressure Estimation Techniques—Part II: Brachial Hemodynamics

[+] Author and Article Information
Mauro Ursino

Department of Electronics, Computer Science and Systems, University of Bologna, viale Risorgimento 2, l 40136, Bologna, Italy

Cristina Cristalli

Department of Electronics and Automatics, University of Ancona, via Brecce Bianche, 160131 Ancona, Italy

J Biomech Eng 117(1), 117-126 (Feb 01, 1995) (10 pages) doi:10.1115/1.2792259 History: Received April 09, 1993; Revised April 20, 1994; Online October 30, 2007


The main biomechanical factors which may affect the accuracy of the oscillometric method for indirect blood pressure measurement are analyzed using a new model of brachial hemodynamics. In a first stage of this work, the model has been used to reproduce some well-known responses of collapsing arteries, such as the sharp increase in compliance, and the nonlinear pressure-flow characteristic with negative dynamic resistance. In a second stage the model has been linked to the arm tissue mechanics description presented in a previous work. The final model so obtained has then been employed to analyze the pattern of the main hemodynamic quantities (pressure pulsations in the cuffs, blood volume changes, blood flow upstream and downstream of the cuffs) during deflation manoeuvres. The simulation results agree with those found in the recent literature quite well. Results indicate that the cuff pressure value for maximum pulsations exhibits a large plateau, located approximately around the mean arterial pressure. However, stiffness of wall artery, or stretching of the cuff internal surface, may significantly alter the obtained results causing a phenomena of “pseudohypertension.”

Copyright © 1995 by The American Society of Mechanical Engineers
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