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Reduced metabolic rate accompanies the hemorrhage-induced hypothermia in conscious rats.

Abstract：

:The mechanism for the hemorrhage-induced drop in body temperature is unknown. This study determined the alterations in cutaneous heat exchange and metabolic heat production caused by a moderate hemorrhage in conscious rats. Chronically instrumented rats were subjected to a 16 ml/kg hemorrhage, followed by a 4-h recovery period, while monitoring body core temperature and cutaneous temperature. Cutaneous heat transfer was disrupted by housing the animals at an elevated (28 degrees C) ambient temperature. A separate group of experiments measured the change in oxygen consumption in the post-hemorrhage period. Moderate hemorrhage caused a drop in body core temperature which stabilized at 0.7+/-0.3 degrees C below control in the second hour following hemorrhage. Disruption of cutaneous heat exchange by reducing the thermal gradient did not diminish the hemorrhage-induced hypothermia. Hemorrhage caused a significant decline of oxygen consumption (-0. 21+/-0.05 ml O(2)/g per h). This 16% drop in resting oxygen consumption was prevented by immediately retransfusing the aspirated blood back into the rat. These data indicate that a decrease in metabolic heat production mediates the drop in body core temperature caused by moderate hemorrhage in conscious rats.

journal_name

Resuscitation

journal_title

Resuscitation

authors

Henderson RA,Whitehurst ME,Morgan KR,Carroll RG

doi

10.1016/s0300-9572(99)00169-0

keywords:

subject

Has Abstract

pub_date

2000-04-01 00:00:00

pages

129-38

issue

2

eissn

0300-9572

issn

1873-1570

pii

S0300-9572(99)00169-0

journal_volume

44

pub_type

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