Responses of the Human Upper Extremity Vascular Bed to Exercise, Cold, Levarterenol, Angiotensin, Hypertension, Heart Failure, and Respiratory Tract Infection with Fever.

Alterations of pressure, flow, and resistance to flow in peripheral vascular beds occur frequently and are often grave (5). Because of technical difficulties, however, pressure and flow are infrequently measured and resistance is rarely calculated. As a result, certain facets of the alterations continue to provoke controversy. The exact site of the increase in peripheral resistance in essential hypertension has not been established. Neither is there unanimity of opinion on the caliber of veins in congestive heart failure, extremity blood flow in respiratory tract infection with fever, or venous