K(+)-channel blockers and coronary vasoconstriction in guinea-pig perfused hearts in-vitro.

Glibenclamide, glipizide and phentolamine, three drugs which have been reported to block ATP-dependent potassium channels, increased the coronary perfusion pressure in guinea-pig isolated hearts perfused at constant flow. Blockers of other types of potassium channels, 4-aminopyridine and UK-66,914, did not significantly increase perfusion pressure. Exposing… CONTINUE READING