[Return of sinus rhythm in patients with paroxysmal heart rhythm disturbances]

The purpose of the work was an assessment of the time and mechanism of the return of sinus rhythm in patients with paroxysmal supraventricular heart rhythm disturbances, treated pharmacologically. The Holter method enabled a precise determination of the mechanism of sinus rhythm return. A group of patients could be isolated with bradycardia-tachycardia syndrome, in whom attacks of MAS syndrome occurred only after regression of arrhythmia. At the time of the return of sinus rhythm and immediately after it transient conduction disturbances and hyperexcitability may occur.