Acute results of transvenous cryoablation of @entity4710 ( XXXX , @entity956 , Wolff-Parkinson-White syndrome, atrioventricular nodal reentry tachycardia).

@entity1 @entity3727 @entity591 @entity849 @entity956 @entity955 @entity4710 @entity850 @entity943
INTRODUCTION: Radiofrequency (RF) catheter ablation currently is used for treatment of @entity943 . Although the success rate is high for almost all @entity4710 ( @entity4710 ), this technique has some drawbacks, especially when pulmonary veins (PV) are targeted for treatment of @entity955 ( @entity955 ). Additionally, new techniques for isolation of the PVs have the drawback that they can be used only for PV isolation and not for routine treatment of other SVTs. The aim of this study was to report on the safety and efficacy of a new cryoablation system for treatment of all SVTs. METHODS AND RESULTS: Forty-nine @entity1 with @entity4710 (38 @entity1 ; age 48 years, range 23-76) were enrolled in the study. Five @entity1 were withdrawn from the study before they underwent cryoablation. The remaining 44 @entity1 were treated with cryoablation (22 @entity955 , 15 @entity956 , 3 accessory pathway, 2 AV nodal reentrant @entity591 , 1 AV junction ablation for permanent @entity955 , 1 @entity591 ). Cryoablation was performed with the CryoCor cryoablation system, which uses a precooling system and @entity3727 as a refrigerant. The number of freezes applied varied according to the index @entity943 treated. Successful isolation of PVs was performed in 20 of (96%) 21 @entity955 @entity1 and 53 of 55 veins. The overall acute success was 98% (43/44). Fifty-three PVs were isolated (2.5/ @entity1 ). The success rate was 100% (23/23) for right-sided procedures. The average and nadir temperatures reached in right-sided and left-sided procedures were -77 degrees C and -80 degrees C and -75 degrees C and -78 degrees C, respectively. No @entity849 was seen. CONCLUSION: This novel cryoablation system appears to be safe and can successfully treat different types of SVTs, including @entity955 . Isolation of PVs is possible without producing @entity850 . Despite the high blood flow in the right atrial isthmus and PVs, bidirectional conduction block can be achieved.
