lidocaine or quinidine plus altered tyrode 's solution further decreased action potential amplitude and the maximum rate of rise of phase 0 of the action potential of purkinje fiber , papillary muscle , and junctional cells , and prolonged activation of junctional cells and papillary muscle , inducing bidirectional block only at the purkinje fiber-papillary muscle junction .
C0007634
cells
C0242358
block