Impact of Pulmonary Vein Anatomy on Long-term Outcome of Cryoballoon Ablation for Atrial Fibrillation

Variant pulmonary vein anatomy （PVA） has been reported to influence the recurrence of atrial fibrillation （AF） after radiofrequency ablation. However, the effects of PVA on AF in patients undergoing cryoballoon ablation （CBA） remain unknown. The present study aimed to examine the impact of PVA on the long-term outcome of CBA for AF. A total of 78 patients （mean age 60.7±10.9 years, 64.1% males） with symptomatic and drug-refractory paroxysmal AF were enrolled in the study. Left atrium （LA） and PVA acquired at computed tomography angiography （CTA） were reconstructed with CARTO 3 SYSTEM. Patients were routinely evaluated by 24-hour Holter monitoring following CBA. Cox regression was used to detect the predictors of AF recurrence after CBA. The results showed abnormal PVA in 30 patients （38.5%） and 18 patients （23.1%） had left common PV （LCPV）. Electrical pulmonary vein isolation was achieved in all patients. After a mean follow-up of 689.5±103.8 days, it was found that patients with abnormal PVA had similar AF recurrence rate to those with normal PVA （26.7% vs. 25.0%, P=0.54）, and there was no significant difference in AF recurrence rate between LCPV patients and non-LCPV patients （33.7% vs. 23.3%, P=0.29）. Cox regression analysis showed that AF duration （72.9±9.0 vs. 42.3±43.2 months, HR 1.001; 95%CI 1.003- 1.014; P〈0.001） and cryo-applications of right-side PVs （3.0±1.6 vs. 4.7±1.7, HR 0.661; 95% CI 0.473-0.925; P=0.016） were independent predictors of freedom from AF, but PVA was not identified as a predictor of long-term success. In conclusion, the variant PVA cannot significantly influence the long-term outcome of AF patients undergoing CBA; longer AF duration and less cryo-applications of right-side PVs are associated with higher AF recurrent rate.

轻度心功能受损的高度房室传导阻滞患者采用中位间隔部起搏是否优于心尖部起搏?(英文)

研究目的：对于轻度心功能受损的高度房室传导阻滞患者，明确右室起搏的最优化位置，同时明确哪一类患者能够从最优化的右心窜起搏中获益。创新要点：首次明确相比于右心室心尖部起搏，中位间隔部起搏明显改善轻度心功能受损，尤其是左室射血分数在35％-40％的高度房室传导阻滞患者的临床预后。研究方法：随机分配进入中位间隔部起搏或心尖部起搏的患者，在基线状态下记录N-末端脑钠肽前体、六分钟步行试验以及心超结果；随访18个月后观察上述结果变化。同时，根据射血分数的不同进行亚组分析。重要结论：相比于右心室心尖部起搏，中位间隔部起搏能够改善轻度心功能受损的高度房窒传导阻滞患者的临床预后，尤其对于左窀射血分数在35%-40％的患者。