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  • Title: Carvedilol reduces myocardial no-reflow by decreasing endothelin-1 via activation of the ATP-sensitive K+ channel.
    Author: Zhao JL, Yang YJ, Pei WD, Sun YH, Zhai M, Liu YX, Gao RL.
    Journal: Perfusion; 2008 Mar; 23(2):111-5. PubMed ID: 18840580.
    Abstract:
    It has been verified that carvedilol can attenuate myocardial no-reflow. However, the effects of carvedilol on adenosine triphosphate-sensitive K(+) (K(ATP)) channel and endothelin-1 (ET-1) are unknown. Forty mini-swines were randomized into 5 study groups: 8 control, 8 carvedilol pretreatment, 8 glibenclamide (K(ATP) channel blocker)-treated, 8 carvedilol and glibenclamide-pre-treated and 8 sham-operated. An acute myocardial infarction(AMI) and reperfusion model was created with a three-hour occlusion of the left anterior descending coronary artery followed by one-hour reperfusion. Compared with the control group, carvedilol significantly decreased the area of no-reflow (myocardial contrast echocardiography: from 78.5+/-4.5% to 24.9+/-4.1%, pathological means: from 82.3+/-1.9% to 25.8+/-4.3% of ligation area, respectively; all p < 0.01) and reduced necrosis size from 98.5+/-1.3% to 74.4+/-4.7% of ligation area, p < 0.05). It also decreased plasma ET-1 and myocardial tissue ET-1. However, glibenclamide abrogated the protective effect of carvedilol. The beneficial effect of carvedilol on myocardial no-reflow could be due to its effect on ET-1 via the activation of the K(ATP) channel.
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