PMID: 8595627Nov 1, 1995Paper

KATP channel modulation in working rat hearts with coronary occlusion: effects of cromakalim, cicletanine, and glibenclamide

Cardiovascular Research
P FerdinandyM Koltai

Abstract

We studied the effects of ATP-sensitive potassium channel (KATP) modulation on ischemic cardiac performance and reperfusion-induced ventricular fibrillation (VF), and assessed the contribution of KATP to the cardioprotective and anti-arrhythmic effect of the anti-hypertensive drug cicletanine. Isolated working rat hearts, subjected to a 10-min coronary occlusion followed by reperfusion, were perfused in the presence of vehicle, 0.1-60 microM cromakalim, an opener of KATP; 3-60 microM cicletanine; and 0.1-10 microM glibenclamide, a blocker of KATP, respectively. All concentrations of cicletanine, similarly to 0.1-10 microM cromakalim, attenuated ischemia-induced deterioration of aortic flow, left ventricular developed pressure, and left ventricular end-diastolic pressure. In contrast to cromakalim, cicletanine did not increase coronary flow. Cicletanine (60 microM) and cromakalim (10 and 60 microM) significantly reduced the incidence of reperfusion-induced VF; however, 60 microM cromakalim triggered VF during ischemia. Lower concentrations of cromakalim and cicletanine did not produce an anti-arrhythmic effect. Cardiac functional parameters were concentration dependently worsened by glibenclamide, and the drug did not change the...Continue Reading

Citations

Nov 29, 2013·American Journal of Physiology. Heart and Circulatory Physiology·Csaba CsonkaPéter Ferdinandy

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