Document Detail

The effect of hypertension on uncontrolled hemorrhage in a rodent model.
MedLine Citation:
PMID:  12153879     Owner:  NLM     Status:  MEDLINE    
Patients with essential hypertension (EH) have higher mortality rates from hemorrhage. How the complex physiologic changes seen in EH affect the response to uncontrolled hemorrhage has yet to be adequately described. OBJECTIVE: To test the null hypothesis that there would be no difference in the hemorrhage volumes and hemodynamic responses to uncontrolled hemorrhage between hypertensive rats (SHRs) and normotensive rats (WKYs). METHODS: Twenty-four adult rats (12 WKYs and 12 SHRs) were anesthetized with althesin via the intra-peritoneal route. The femoral artery was cannulated by cutdown for mean arterial pressure (MAP) measurement and blood gas sampling. Twelve rats (6 WKYs and 6 SHRs) underwent uncontrolled hemorrhage by 50% tail amputation. Twelve rats (6 WKYs and 6 SHRs) served as non-hemorrhage controls. The MAP, base excess (BE), and cumulative blood loss were measured pre-hemorrhage and then every 15 minutes post-hemorrhage for 90 minutes. Data were reported as mean +/- standard error of the mean. Comparisons between control and uncontrolled hemorrhage groups were analyzed by analysis of variance (ANOVA) with repeated-measures post-hoc testing by Bonferroni. Statistical significance was defined by an alpha = 0.05. RESULTS: Mortality rates were significantly higher (p < 0.05) for the SHRs (100%) as compared with the WKYs (33%). Changes in time-averaged MAP post-hemorrhage were significantly greater (p < 0.001) in the SHR group (88 +/- 10 mm Hg) as compared with the WKY group (48 +/- 4 mm Hg). Hemorrhage volume was significantly lower (p = 0.02) in the SHR group (3.7 +/- 0.5 mL) as compared with the WKY group (6.1 +/- 0.7 mL). CONCLUSIONS: Hypertensive rats had a higher mortality rate than normotensives from a comparable vascular injury with lower hemorrhage volumes.
Richard Sinert; Matthew T Spencer; Renee Wilson; Mark Silverberg; Minal Patel; Christopher I Doty; Anat Sapan; Bonny J Baron
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Academic emergency medicine : official journal of the Society for Academic Emergency Medicine     Volume:  9     ISSN:  1069-6563     ISO Abbreviation:  Acad Emerg Med     Publication Date:  2002 Aug 
Date Detail:
Created Date:  2002-08-02     Completed Date:  2002-09-10     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  9418450     Medline TA:  Acad Emerg Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  767-74     Citation Subset:  IM    
Department of Emergency Medicine, State University of New York Downstate Medical Center, Brooklyn, NY 11203, USA.
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MeSH Terms
Hemorrhage / etiology*,  mortality
Hypertension / complications*
Models, Cardiovascular
Rats, Inbred SHR
Rats, Inbred WKY

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