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Hypertension. 1995;25:918-923

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(Hypertension. 1995;25:918-923.)
© 1995 American Heart Association, Inc.


Articles

Measuring Forearm Blood Flow and Interpreting the Responses to Drugs and Mediators

Nigel Benjamin; Alison Calver; Joe Collier; Brian Robinson; Patrick Vallance; David Webb

From the Department of Medicine and Therapeutics, University of Aberdeen (Scotland) (N.B.); the Clinical Pharmacology Unit, Department of Pharmacology and Clinical Pharmacology, St George's Hospital Medical School, London (A.C., J.C., B.R., P.V.); and the Department of Medicine, Western General Hospital, University of Edinburgh (Scotland) (D.W.), UK.

Correspondence to Patrick Vallance, Clinical Pharmacology Unit, Department of Pharmacology and Clinical Pharmacology, St George's Hospital Medical School, London SW17 0RE, UK.

Abstract Venous occlusion plethysmography has been widely used to study forearm blood flow. The principle of the technique is straightforward: the rate of swelling of the forearm during occlusion of venous return is used to assess the rate of arterial inflow. Provided that perfusion pressure (arterial blood pressure) remains constant, changes in flow reflect changes in smooth muscle tone in small arteries and arterioles. Local infusion into the brachial artery allows assessment of the direct effect of drugs on vascular tone and has been used to probe the roles of endogenous mediators. The technique is at its most powerful when dose-response relationships to different drugs or mediators within a single study are being compared but can also be used for comparison of responses to drugs between healthy control subjects and patient populations. However, when responses between groups are being compared, it is important to take into account the starting conditions of baseline blood flow and pressure. This article describes venous occlusion plethysmography, discusses the presentation and analysis of data (dose of drug or concentration? forearm blood flow or resistance?), and highlights certain potential problems and limitations of the technique as a means of studying disease states.


Key Words: blood flow • plethysmography • vascular resistance




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