Improved preservation of endothelial function at 4 degrees C.
Hypothermia combined with chemical cardioplegia is routinely used clinically for perioperative myocardial protection and for donor heart preservation. Profound hypothermia can have an adverse influence on post-preservation endothelial and myocardial functions. In this study, we investigated the effect of temperature on endothelial and myocardial functions following global cardiac ischaemia in the isolated rat heart. A 5-hydroxytryptamine (5-HT)-induced increase in coronary flow was used as a selective probe to assess endothelial function, while myocardial function was measured by a working rat heart model. After recording control observations for endothelial and myocardial functions, hearts were kept ischaemic for 30 or 60 min without cardioplegia (groups 1 and 2, respectively) and for 60, 90 or 120 min following a single infusion of St. Thomas' Hospital solution (groups 3, 4 and 5, respectively). In each group, hearts were kept ischaemic at 20 degrees C or at 4 degrees C (n = 12 in each group). Endothelial and myocardial functions were reevaluated and compared with control values.(ABSTRACT TRUNCATED AT 250 WORDS)
Amrani
M
M
National Heart and Lung Institute, London, UK.
Mankad
P S
PS
Yacoub
M H
MH
D000818:Animals; D003331:Coronary Vessels / Q000187:drug effects / Q000502:physiology*; D004730:Endothelium, Vascular / Q000187:drug effects / Q000502:physiology*; D006062:Gonadotropins / Q000494:pharmacology; D006321:Heart / Q000502:physiology*; D016027:Heart Transplantation; D008297:Male; D009926:Organ Preservation / Q000379:methods*; D051381:Rats; D011919:Rats, Inbred Strains; D012701:Serotonin / Q000494:pharmacology; D013696:Temperature
D006062:Gonadotropins; D012701:Serotonin