Figure 34-16 Digitalis effect on ST segments and T waves (i.e., ectopic atrial rhythm, 2:1 atrioventricular [AV] block, type 1 second-degree AV block, left ventricular hypertrophy with strain). (Adapted from Marriott HJL: Practical Electrocardiography, 7th ed. Baltimore, Williams & Wilkins, 1983.)