resting and action potentials as well as refractory periods of single muscle cells and purkinje fibers were measured by the microelectrode technique. -- the antikaliuretic substances potassium canrenoate , amiloride and triamterene led to a significant concentration-dependent prolongation of action potential duration and , correspondingly , to a lengthening of the refractory period .
C0002502
amiloride
C0040869
triamterene