摘要：34-years-old female patient admitted to the Department with complains of palpitations. Manifest Wolff–Parkinson–White syndrome was diagnosed in the childhood. During mapping of the right paraseptal region the earliest area of preexcitation was identified at the orifice of coronary sinus. At this area several irrigated radiofrequecy ablations (temperature 48°С and power 38–42 W) were made. During ablation transient loss of preexcitation was induced. After ablation conduction through the accessory pathway resumed. Total time of radiofrequency ablation in the right chamber was 12 min. Using transaortic access several radiofrequency ablations at the left paraseptal region were performed with transient loss of preexcitation. Due to unstable position of the electrode ablation was also unsuccessful. Under fluoroscopy transseptal puncture was performed. Having obtained stable position of the electrode at the area of the earliest preexcitation, radiofrequency ablation was made. During ablation there was loss of preexcitation and the effect was permanent.
