Heterogeneous Regional Vascular Responses to Simulated Transient Hypovolemia in Man

Overview

Journal Intensive Care Med

Specialty Critical Care

Date 1994 Jul 1

PMID 7798445

Citations 21

Authors

A R Edouard

A C Degremont

J Duranteau

E Pussard

A Berdeaux

K Samii

Affiliations

Soon will be listed here.

Abstract

Objective: To describe the evolution of systemic and regional blood flows during and after hypovolemia in humans.

Design: Simulation of hypovolemia by a prolonged application of lower body negative pressure (LBNP).

Setting: Laboratory of Clinical Research, Surgical Intensive Care Unit of an University Hospital.

Participants: 8 healthy male volunteers.

Interventions: 3 successive and increasing 15 min-levels of LBNP were followed by a progressive return (10 min) to atmospheric pressure, then a 60 min-recovery period.

Measurements And Main Results: Simulated hypovolemia induced a parallel one-third decrease in cardiac output (bioimpedance), musculocutaneous (venous plethysmography) and splanchnic (ICG clearance) blood flows. Adrenergic-mediated peripheral vasoconstriction prevented any change in mean arterial pressure. The decrease in renal blood flow (PAH clearance) was limited, glomerular filtration rate (inulin clearance) unchanged and thus filtration fraction increased. All the cardiovascular and biological variables returned to pre-LBNP values during the recovery period except for splanchnic blood flow which remained below control values 60 min after the return to atmospheric pressure.

Conclusions: Since a sustained splanchnic vasoconstriction follows a transient normotensive hypovolemia in healthy men despite adequate treatment considering arterial pressure and cardiac output, the therapeutic goals of fluid resuscitation after hypovolemic shock might be revisited and a supranormal value of cardiac output proposed.

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