Effect of sustained endotoxemia on alpha1-adrenergic responsiveness in parenterally fed rats.

Abstract:

:We investigated the effect of endotoxemia on alpha1-adrenergic receptor-mediated smooth muscle contraction as measured by mean arterial pressure (MAP) in response to incremental doses of a vasopressor. Twelve male Sprague-Dawley rats were randomized to receive parenteral nutrition alone (PN) or in combination with a continuous infusion of endotoxin (PN-LPS) for 48 hours. Incremental doses of phenylephrine were given and peak MAP response was recorded. The endotoxin group had a decreased rise in MAP with the same dose of phenylephrine compared with the control group (59 +/- 14 and 99 +/- 12 mm Hg, respectively, p<0.001). However, the baseline MAP was higher in the endotoxin group (102 +/- 18 and 71 +/- 7 mm Hg, respectively, p<0.002). The overall maximum effect was the same for both groups (161 +/- 16 and 170 +/- 8 mm Hg, respectively, p=NS). These data indicate that sustained endotoxemia does not result in desensitization of alpha1-adrenergic responsiveness. Other mechanisms are responsible for the ineffectiveness of vasopressors during advanced sepsis.

journal_name

Pharmacotherapy

journal_title

Pharmacotherapy

authors

Dickerson RN,Lima JJ,Kuhl DA,Brown RO,Hak LJ

subject

Has Abstract

pub_date

1998-01-01 00:00:00

pages

170-4

issue

1

eissn

0277-0008

issn

1875-9114

journal_volume

18

pub_type

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