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The contribution of the beta-adrenergic system to the cardiovascular response to hypovolemia.

Abstract：

:Unanesthetized, chronically instrumented, nonpregnant sheep were studied in periods of progressive blood withdrawal, hypovolemic shock, blood reinfusion, and recovery. Hemodynamic responses were recorded during experiments with an intact beta-adrenergic system (saline solution), beta-adrenergic blockage (propranolol), and beta-adrenergic stimulation (isoxsuprine). With an intact beta-adrenergic system, stepwise bleeding produced a progressive decrease in arterial pressure, stroke volume, and cardiac output and an increase in systemic vascular resistance; heart rate increased initially but fell when hypovolemia became severe. All circulatory parameters returned toward control valves during blood reinfusion and recovery. In animals deprived of beta-adrenergic control, the hemodynamic response to progressive hypovolemia and blood reinfusion was not greatly different from that of control animals, despite abolition of tachycardia. During beta-adrenergic stimulation, arterial pressure and cardiac output fell more rapidly than in control and tachycardia was relatively small; cardiac output and stroke volume rebounded strikingly during reinfusion and recovery. These results support findings of others that the role of the beta-adrenergic system is minor during hypovolemia. When pharmacologically activated, it might play a significant role in the posthypovolemia compensatory mechanisms.

journal_name

Am J Obstet Gynecol

journal_title

American journal of obstetrics and gynecology

authors

Ushioda E,Nuwayhid B,Kleinman G,Tabsh K,Brinkman CR 3rd,Assali NS

doi

10.1016/s0002-9378(16)32238-4

subject

Has Abstract

pub_date

1983-10-15 00:00:00

pages

423-9

issue

4

eissn

0002-9378

issn

1097-6868

pii

S0002-9378(16)32238-4

journal_volume

147

pub_type

杂志文章

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