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RESEARCH PAPERS

An Experimental Study of Pressure Losses in Pulsatile Flows Through Rigid and Pulsating Stenosis

[+] Author and Article Information
R. Rabinovitz, D. Degani, C. Gutfinger

Technion—Israel Institute of Technology, Haifa, Israel

S. Milo

Department of Cardiac Surgery, Sheba Medical Center, Tel-Hashomer, Israel

J Biomech Eng 106(4), 309-314 (Nov 01, 1984) (6 pages) doi:10.1115/1.3138499 History: Received December 22, 1983; Revised February 22, 1984; Online June 15, 2009

Abstract

The time-dependent pressure curves of a pulsatile flow across rigid and pulsating stenoses were investigated experimentally in a laboratory simulator of the outflow tract of the heart right ventricle. The experiments were performed within the range of physiological conditions of frequency and flow rate. The experimental setup consisted of a closed flow system which was operated by a pulsatile pump, and a test chamber which enabled checking different modes of stenosis. Rigid constrictions were simulated by means of axisymmetric blunt-ended annular plugs with moderate-to-severe area reductions. The pulsating stenosis consisted of a short starling resistor device operated by a pulsating external pressure which was synchronized by the pulsatile flow. It was found that the shape of the time-dependent pressure curve upstream of the stenosis was different in the case of rigid stenosis than in the pulsating one. Potential clinical applications of the work may relate to diagnosis of the type of stenosis in the congenital heart disease known as Tetralogy of Fallot.

Copyright © 1984 by ASME
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