Pool analyses indicated that CB ablation was more beneficial in terms of procedural time [ st and ard mean difference = −0.58 ; 95 % confidence interval ( CI ) , −0.85 to −0.30 ] , complications without phrenic nerve injury ( PNI ) [ odds ratio ( OR ) = 0.79 ; 95 % CI , 0.67–0.93 ; I2 = 16 % ] , and recrudescence ( OR = 0.83 ; 95 % CI , 0.70–0.97 ; I2 = 63 % ) for PAF ; however , the total complications of CB was higher than RF .
The subgroup analysis found that , compared with non-contact force radiofrequency ( non-CF-RF ) , both first-generation cryoballoon ( CB1 ) and second-generation cryoballoon ( CB2 ) ablation  could reduce complications with PNI , procedural time , and recrudescence .
However , the safety and efficacy of CB2 was similar to those of CF-RF .
Conclusion Available overall and subgroup data suggested that both CB1 and CB2 were more beneficial than RF ablation , and the main advantages were reflected in comparing them with non-CF-RF .
However , CF-RF and CB2 showed similar clinical benefits
Purpose The present systematic review and meta- analysis aim ed to assess and compare the safety and efficacy of radiofrequency ( RF ) and cryoballoon ( CB ) ablation for paroxysmal atrial fibrillation ( PAF ) .
RF and CB ablation are two frequently used methods for pulmonary vein isolation in PAF , but which is a better choice for PAF remains uncertain .
Pericardial effusion in atrial fibrillation ablation: a comparison between cryoballoon and radiofrequency pulmonary vein isolation.
AIMS  Atrial fibrillation ( AF ) ablation  is increasingly being performed in electrophysiology laboratories . Pericardial effusion ( PE ) is certainly one of the most frequently observed complications during AF ablation . The aim of our study was to investigate the incidence and outcome of PE following cryothermal energy balloon ablation ( CBA ) in comparison with conventional circumferential pulmonary vein isolation with a focal radiofrequency ( RF ) catheter . METHODS AND RESULTS A total of 133 consecutive patients ( 105 males ) with paroxysmal AF were included in this study . Forty-six patients ( 36 males ) underwent CBA  ( A rct ic Front , Medtronic , USA ) and 87 ( 69 males ) point-by-point RF ablation guided by electroanatomical mapping ( Carto , Biosense Webster , Diamond Bar , CA , USA ) . Ablation was performed under general anaesthesia with both techniques . All patients underwent a 2D transthoracic echocardiogram within 24 h before and after the procedure as routinely performed in our centre . Pericardial effusion was detected in 19 ( 14.2 % ) of 133 patients . Sixteen patients presented mild effusion , one moderate effusion , and two pericardial tamponades . There was no significant difference in the incidence of PE between the cryoballoon and the RF group ( 11 vs. 16 % ) . A longer procedural time , coronary artery disease , and arterial hypertension were found to be independent predictors of PE during AF ablation . CONCLUSION Pericardial effusion occurred in a similar proportion following CBA and RF ablation for AF .  Pericardial effusion was mostly mild and asymptomatic , with benign clinical outcome not requiring additional hospitalization days
Pool analyses indicated that CB ablation was more beneficial in terms of procedural time [ st and ard mean difference = −0.58 ; 95 % confidence interval ( CI ) , −0.85 to −0.30 ] , complications without phrenic nerve injury ( PNI ) [ odds ratio ( OR ) = 0.79 ; 95 % CI , 0.67–0.93 ; I2 = 16 % ] , and recrudescence ( OR = 0.83 ; 95 % CI , 0.70–0.97 ; I2 = 63 % ) for PAF ; however , the total complications of CB was higher than RF .
The subgroup analysis found that , compared with non-contact force radiofrequency ( non-CF-RF ) , both first-generation cryoballoon ( CB1 ) and second-generation cryoballoon ( CB2 ) ablation  could reduce complications with PNI , procedural time , and recrudescence .
However , the safety and efficacy of CB2 was similar to those of CF-RF .
Conclusion Available overall and subgroup data suggested that both CB1 and CB2 were more beneficial than RF ablation , and the main advantages were reflected in comparing them with non-CF-RF .
However , CF-RF and CB2 showed similar clinical benefits
Purpose The present systematic review and meta- analysis aim ed to assess and compare the safety and efficacy of radiofrequency ( RF ) and cryoballoon ( CB ) ablation for paroxysmal atrial fibrillation ( PAF ) .
RF and CB ablation are two frequently used methods for pulmonary vein isolation in PAF , but which is a better choice for PAF remains uncertain .