Document Detail


Influence of cooling on mesenteric vascular reactivity.
MedLine Citation:
PMID:  8971516     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVES: Cardiopulmonary bypass has been shown to cause hypoperfusion of certain vascular beds leading to multiple system organ failure. It has been reported that the gut may be an important trigger. The underlying mechanism is not fully known, but vascular changes, particularly those due to cooling, could play a role. METHODS: We examined the effect of cooling (28 degrees C) and subsequent rewarming (37 degrees C) on the vascular reactivity of the rabbit mesenteric artery and abdominal aorta to a range of vasoactive substances using an in vitro organ bath apparatus. Cumulative concentration-responses of the agonists (noradrenaline, histamine, dopamine and potassium chloride) were examined at 37 degrees C, then repeated at 28 degrees C and then subsequently repeated after rewarming to 37 degrees C. RESULTS: All agonists were capable of inducing a constrictor response on the mesenteric artery and abdominal aorta. The results represent means +/- SEM. There was an increase in potency of noradrenaline at the lower temperature [from 5.6 +/- 0.1 (37 degrees C) to 6.0 +/- 0.1 (28 degrees C); Bonferroni-corrected P < 0.05; n = 10], which returned to normal [5.6 +/- 0.1 (37 degrees C)] following rewarming in the mesenteric artery. In contrast, there was a decrease in potency of noradrenaline in the aorta on cooling [6.5 +/- 0.1 (37 degrees C) to 6.2 +/- 0.1 (28 degrees C); Bonferroni-corrected P < 0.05; n = 8]. Neither histamine or dopamine showed any difference in potency at 28 degrees C or at 37 degrees C following rewarming in the mesenteric artery or aorta. There was no difference in the efficacy of the response of the mesenteric artery to noradrenaline as indicated by the maximum responses. However, the response to the highest dose of dopamine was increased on rewarming to 37 degrees C compared to control responses at 37 degrees C before cooling in the aorta [7.23 +/- 1.48 g vs 3.6 +/- 0.6 g; Bonferroni-corrected P < 0.05; n = 14]. Histamine contractions were attenuated at 28 degrees C and following rewarming to 37 degrees C in the mesenteric artery [5.5 +/- 0.5 g (37 degrees C) vs 2.2 +/- 0.2 g (28 degrees C); Bonferroni-corrected P < 0.05; n = 18], [5.5 +/- 0.5 g (37 degrees C) vs 2.32 +/- 0.5 g (37 degrees C rewarming); Bonferroni-corrected P < 0.05; n = 18]. CONCLUSIONS: We conclude that cooling elicits a heterogeneous responsiveness of the rabbit mesenteric artery and abdominal aorta to noradrenaline and dopamine which could have important implications for blood flow to mesenteric vascular beds during hypothermic cardiopulmonary bypass.
Authors:
S Allen; M Kumar; B Arnfeh; A Chester; N Dzimiri; C M Duran; M Yacoub
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Publication Detail:
Type:  In Vitro; Journal Article    
Journal Detail:
Title:  European journal of cardio-thoracic surgery : official journal of the European Association for Cardio-thoracic Surgery     Volume:  10     ISSN:  1010-7940     ISO Abbreviation:  Eur J Cardiothorac Surg     Publication Date:  1996  
Date Detail:
Created Date:  1997-03-18     Completed Date:  1997-03-18     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8804069     Medline TA:  Eur J Cardiothorac Surg     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  1015-20     Citation Subset:  IM    
Affiliation:
Heart Science Centre, National Hert and Lung Institute, Harefield Hospital, Middlesex, U.K.
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MeSH Terms
Descriptor/Qualifier:
Adrenergic alpha-Agonists / pharmacology
Animals
Aorta, Abdominal / physiology
Cardiopulmonary Bypass
Dopamine / pharmacology
Histamine / pharmacology
Hypothermia, Induced*
Mesenteric Arteries / physiology*
Norepinephrine / pharmacology
Potassium Chloride / pharmacology
Rabbits
Rewarming
Vasoconstriction
Chemical
Reg. No./Substance:
0/Adrenergic alpha-Agonists; 51-41-2/Norepinephrine; 51-45-6/Histamine; 7447-40-7/Potassium Chloride

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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