in twenty patients with advanced heart disease with severe cardiac failure and the presence of conduction disturbances before digitalis therapy , but in whom such disturbances were worsened or revealed by the treatment , it was necessary to insert a permanent pacemaker in order to make effective long term digitalisation possible without the risk of excessive bradycardia or pauses due to worsening of atrioventricular block .
C0018787
heart
C0018801
cardiac failure