after inactivation of the fast sodium channel by ttx ( 10 ( -5 ) m ) or by partial depolarization ( 25 mm k+ tyrode ) of electrically driven cat and guinea pig left auricle , catecholamines ( epinephrine and isoproterenol , 4 x 10 ( -7 ) to 5 x 10 ( -6 ) m ) , histamine ( 10 ( -6 ) to 10 ( -5 ) m ) , and celluline-a restored the electrical and mechanical activity .
C0007412
catecholamines
C0022245
isoproterenol