[Long-term treatment of bradycardia by means of an atropine ester (SCH 1000). Electrophysiological and clinical results].

Electrophysiological effects of the atropin ester Ipatropiumbromide (SCH 1000) were investigated in 15 patients by His electrocardiography and high frequency atrial stimulation. Heart rate increased by 50% of base line heart rate, PA- and AH-intervals and sinus node recovery time decreased, the HF-interval remained unchanged. Physiological av-block by atrial stimulation occurred at significant higher stimulation frequencies with SCH 1000 than without medication. Additional 15 patients were treated for a longer follow-up period. Increase of resting heart rate averaged 15%. Equivocal effects on heart rate were found with exercise after SCH 1000. Non-cardiac side effects were found in 5 patients.