Nonparoxysmal A-V Nodal Tachycardia

Acceleration of impulse formation in the ordinarily subsidiary A-V nodal pacemaker is manifested in clinical electrocardiograms in a paroxysmal and a nonparoxysmal variety. The former occurs as a rule in normal hearts, the latter in pathologic conditions, frequently, but not invariably also causing A-V block. The electrocardiographic and clinical aspects of nonparoxysmal nodal tachycarida were studied in 30 cases and the relative importance of the disturbance was evaluated in 3 conditions in which it is found most frequently, namely, digitalis effect, acute rheumatic fever, and recent posterior wall infarction.