The effect of sympatholytics on uncontrolled hemorrhage.

Abstract:

OBJECTIVE:To assess the possible benefits of sympatholytics on uncontrolled hemorrhage in unanesthetized rats. DESIGN:A randomized laboratory study using rats to test the effects of sympatholytics on uncontrolled hemorrhage. SETTING:Research laboratory. SUBJECTS:Forty female Sprague-Dawley rats, randomly assigned into four groups according to the treatment: untreated (Control); alpha-adrenergic blockade with phenoxybenzamine (Alpha); beta-adrenergic blockade with propranolol (Beta); and a combined alpha- and beta-adrenergic blockade by phenoxybenzamine and propranolol (Alpha/Beta). INTERVENTION:After cannulation under light ether, the rats were allowed to awaken. A baseline blood sample was withdrawn. The uncontrolled hemorrhage was initiated by tail resection and allowed to continue without intervention for the duration of the experiment. After 15 mins, 80 mL/kg isotonic saline fluid was infused at 4.4 mL/min. At 60 mins, another blood sample was drawn; changes in mean arterial pressure, hematocrit, blood loss, and mortality were observed for up to 180 mins. MAIN OUTCOME MEASURE:Survival, mortality, blood loss (amount, prevalence, and rate), and hemodynamic variables (mean arterial pressure, pulse rate, hematocrit). RESULTS:In the Alpha group, there was a reduction in spontaneous blood loss compared with the control group (2.9 vs. 10.6 mL/kg, respectively) and 100% survival. In contrast, the Beta group exhibited an increase in tail blood loss (21.1 mL) and a decreased survival (10%). Despite the enhanced hemorrhage in the Alpha/Beta group (17.0 mL/kg) compared with controls, the survival rate in both of these groups was 60%. In all groups, no significant increase in tail blood loss was observed after 60 mins. CONCLUSIONS:An alpha-adrenergic blockade increased survival in uncontrolled hemorrhage by significantly reducing spontaneous blood loss. Conversely, a beta-adrenergic blockade significantly decreased survival and increased blood loss, whereas a combined blockade significantly increased blood loss without affecting survival.

journal_name

Crit Care Med

journal_title

Critical care medicine

authors

Rudé MJ,Soucy DM,Hagedorn F,Illner H,Shires GT

doi

10.1097/00003246-199909000-00025

subject

Has Abstract

pub_date

1999-09-01 00:00:00

pages

1856-61

issue

9

eissn

0090-3493

issn

1530-0293

journal_volume

27

pub_type

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