Abstract
Clinically significant conditions sometimes result in a flow reduction to one downstream branch of a major bifurcation as the result of a reduction in the resistance of the contralateral branch. This condition has been demonstrated at several major bifurcations in man and is known as “steal”. In this paper this phenomenon is modeled using the parameters of mean pressure, flow, and resistance in the upstream and two downstream vessels. The model is qualitatively confirmed in dogs by a pressure flow study at the external iliac trifurcation using manually controlled distal resistances. Flows were measured electromagnetically, and pressures by a fluid-filled catheter and diaphram LVDT transducer. As a result of this study a simple test is devised to determine if a site selected for vascular surgery has a potential for developing steal.
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