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• W2328653607 abstract "We assessed the evolution with time of the responsiveness of three vascular beds in dilated cardiomyopathic hamsters of the Bio TO-2 strain. Eight cardiomyopathic hamsters and 8 control hamsters were investigated at 180 and 300 days of age. Thoracic aorta and mesenteric and renal artery rings were studied in isolated organ baths. Cumulative concentration-response relations to phenylephrine, acetylcholine, sodium nitroprusside, and angiotensin II were established for each ring. Maximum effect (Emax) and concentration inducing 50% of Emax (EC50) were determined from each concentration-response curve and pD2 was calculated as -log(EC50). Compared with control hamsters, in cardiomyopathic hamsters, Emax of phenylephrine was not modified in aorta, whereas it was significantly lower in mesenteric (-6% and -33% at 180 and 300 days, respectively) and renal (-17% and -24%) arteries. Emax of acetylcholine was significantly higher in aorta (+57% and +30%), mesenteric (+42% and +34%), and renal (+168% and +70%) arteries. Emax of sodium nitroprusside was significantly higher in aorta (+26% and +16%) and tended to be higher in mesenteric (+25% and +23%) and renal (+27% and +10%) arteries. Emax of angiotensin II was not modified in aorta and tended to be lower in mesenteric artery at 300 days. The pD2 of phenylephrine was significantly increased in aorta and the pD2 of sodium nitroprusside was significantly increased in aorta and renal artery. In conclusion, in dilated cardiomyopathic hamsters, endothelium-dependent and -independent vasodilations are enhanced early, demonstrating increased sensitivity of vascular smooth muscle to nitric oxide. This abnormality may be involved in the decreased responsiveness to phenylephrine and angiotensin II." @default.
• W2328653607 created "2016-06-24" @default.
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• W2328653607 date "2001-03-01" @default.
• W2328653607 modified "2023-09-24" @default.
• W2328653607 title "Increased Sensitivity of Vascular Smooth Muscle to Nitric Oxide in Dilated Cardiomyopathy of Syrian Hamsters (Bio TO-2 Strain)" @default.
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• W2328653607 doi "https://doi.org/10.1097/00005344-200103000-00007" @default.
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