Ablation for longstanding permanent atrial fibrillation: results from a randomized study comparing three different strategies. Efficacy of additional ablation of complex fractionated atrial electrograms for catheter ablation of nonparoxysmal atrial fibrillation. Randomized Study Comparing Combined Pulmonary Vein–Left Atrial Junction Disconnection and Cavotricuspid Isthmus Ablation Versus Pulmonary Vein–Left Atrial Junction Disconnection Alone in Patients Presenting With Typical Atrial Flutter and Atrial Fibrillation Atrial fibrillation in patients with heart failure: Role of catheter ablation therapies. Randomized Ablation Strategies for the Treatment of Persistent Atrial Fibrillation: RASTA Study A randomized clinical trial of early invasive intervention for atrial fibrillation (EARLY-AF) - methods and rationale. Natural History and Long-Term Outcomes of Ablated Atrial Fibrillation Ablation of atrial fibrillation with cryoballoon or duty-cycled radiofrequency pulmonary vein ablation catheter: a randomized controlled study comparing the clinical outcome and safety; the AF-COR study. Pulmonary venous isolation versus additional substrate modification as treatment for paroxysmal atrial fibrillation Symptomatic and asymptomatic atrial fibrillation after pulmonary vein ablation and the impact on quality of life. A randomized assessment of the incremental role of ablation of complex fractionated atrial electrograms after antral pulmonary vein isolation for long-lasting persistent atrial fibrillation. Electrogram-guided substrate ablation with or without pulmonary vein isolation in patients with persistent atrial fibrillation. Efficacy of catheter ablation and surgical CryoMaze procedure in patients with long-lasting persistent atrial fibrillation and rheumatic heart disease: a randomized trial. A prospective, multicenter evaluation of ablating complex fractionated electrograms (CFEs) during atrial fibrillation (AF) identified by an automated mapping algorithm: acute effects on AF and efficacy as an adjuvant strategy. Small or Large Isolation Areas Around the Pulmonary Veins for the Treatment of Atrial Fibrillation?: Results From a Prospective Randomized Study Rationale and Design of FIRE AND ICE: A multicenter randomized trial comparing efficacy and safety of pulmonary vein isolation using a cryoballoon versus radiofrequency ablation with 3D-reconstruction. Does electrogram guided substrate ablation add to the success of pulmonary vein isolation in patients with paroxysmal atrial fibrillation? A prospective, randomized study.
BACKGROUND This prospect i ve multicenter r and omized study aim ed to compare the efficacy of 3 common ablation methods used for longst and ing permanent atrial fibrillation ( AF ) . METHODS A total of 144 patients with longst and ing permanent AF ( median duration 28 months ) were r and omly assigned to circumferential pulmonary vein ablation ( CPVA , group 1 , n = 47 ) , to pulmonary vein antrum isolation ( PVAI , group 2 , n = 48 ) or to a hybrid strategy combining ablation of complex fractionated or rapid atrial electrograms ( CFAE ) in both atria followed by a pulmonary vein antrum isolation ( CFAE + PVAI , group 3 , n = 49 ) . RESULTS Scarring in the left atrium and structural heart disease/hypertension were present in most patients ( 65 % ) . After a mean follow-up of 16 months , 11 % of patients in group 1 , 40 % of patients in group 2 and 61 % of patients in group 3 were in sinus rhythm after one procedure and with no antiarrhythmic drugs ( P < .001 ) . Sinus rhythm maintenance would increase respectively to 28 % ( group 1 ) , 83 % ( group 2 ) , and 94 % ( group 3 ) after 2 procedures and with antiarrhythmic drugs ( AADs , P < .001 ) . The AF terminated during ablation , either by conversion to sinus rhythm or organization into an atrial tachyarrhythmia , in 13 % of patients ( group 1 ) , 44 % ( group 2 ) , and 74 % ( group 3 ) respectively . CFAE alone , performed as the first step of the ablation in group 3 , organized AF in only 1 patient . CONCLUSION In this study , the hybrid AF ablation strategy including antrum isolation and CFAE ablation had the highest likelihood of maintaining sinus rhythm in patients with longst and ing permanent AF . Electrical isolation of the PVs , although inadequate if performed alone , is relevant to achieve long-term sinus rhythm maintenance after ablation . Bi-atrial CFAE ablation had a minimal impact on AF termination during ablation BACKGROUND The efficacy of ablation of complex fractionated atrial electrograms ( CFEs ) in the single ablation procedure for nonparoxysmal atrial fibrillation ( AF ) patients is not well demonstrated . The aim of this study was to compare the ablation strategies of pulmonary vein isolation ( PVI ) plus linear ablation with and without additional ablation ofCFEs in these patients . METHODS Consecutive 60 patients ( 49 + /- 11 years old , 50 male , 10 female ) with nonparoxysmal AF underwent catheter ablation guided by a NavX mapping system .  A stepwise approach included a circumferential PVI and left atrial ( LA ) linear ablation followed by either the additional ablation of continuous CFEs in the LA/coronary sinus ( the first 30 patients ) or not ( the second 30 patients ) , detected by an automatic algorithm . RESULTS There was no difference in the baseline characteristics between the two groups . Complete PVI eliminated some continuous CFEs and altered the distribution of CFEs . Following PVI and linear ablation , the remaining continuous CFEs were identified in 7.9 + /-10 % mapping sites of the LA and CS , and were ablated successfully with a procedural AF termination rate of 53 % . With a follow-up of 19 + /-11 months , a Kaplan-Meier analysis showed that the patients with additional ablation of the CFEs had a higher rate of sinus rhythm maintenance . Multivariate analysis showed the single procedure success could be predicted by the procedural AF termination and the additional ablation of continuous CFEs in the LA/CS . CONCLUSIONS Ablation of continuous CFEs after PVI and LA linear ablation had a better long-term efficacy based on the results of single-ablation procedure Background —Atrial flutter ( AFL ) and atrial fibrillation ( AF ) frequently coexist in the same patient . Recently it has been demonstrated that the triggers for both AF and AFL may originate in the pulmonary veins ( PVs ) . We hypothesized that in patients with both AF and typical AFL , pulmonary vein – left atrial junction ( PV-LAJ ) disconnection may eliminate both arrhythmias . Methods and Results —Consecutive patients with documented symptomatic AF and typical AFL were r and omly assigned to have PV-LAJ disconnection combined with cavotricuspid isthmus ( CTI ) ablation ( group 1 , n=49 ) or PV-LAJ disconnection alone ( group 2 , n=59 ) . Within the first 8 weeks after ablation , 32 of the group 2 patients had typical AFL documented , whereas none was seen in group 1 . Twenty of these 32 converted to sinus rhythm after initiating antiarrhythmic drugs ( AADs ) . Twelve were cardioverted , and AADs were started . After 8 weeks , all AADS were stopped , and only 3 patients continued to have recurrent sustained typical AFL that was eliminated by CTI ablation . Beyond 8 weeks of follow-up , 7 patients in group 1 and 6 patients in group 2 ( 14 % and 11 % , respectively ) continued to have AF . Ten of these 13 patients underwent a repeat PV-LAJ disconnection procedure and were cured . The remaining 3 remained in normal sinus rhythm while taking AADs . Conclusions —In patients with both AFL and AF , PV-LAJ disconnection alone may be sufficient to control both arrhythmias . CTI block reduced early postablation recurrence of arrhythmias , which in the majority of patients reflects a short-term clinical problem Atrial fibrillation ( AF ) represents the most common sustained cardiac arrhythmia in patients with heart failure ( HF ) . AF in HF patients is associated with worsening of symptoms and also results in a substantial increase in mortality . Although HF patients in sinus rhythm have a better outcome than patients with AF , several r and omized studies investigating pharmacological rhythm control versus rate control have shown no advantage of one strategy over the other in terms of patient outcomes . Catheter-based ablation therapy is a newer therapeutic option with a rapidly evolving and changing role in the management of this arrhythmia . In the present review , the authors discuss the epidemiology , pathophysiology and prognostic significance of AF in patients with HF . Exclusively addressed are studies investigating catheter-based ablation for rhythm-control and rate-control therapies in the management of AF in HF patients Background — The single-procedure efficacy of pulmonary vein isolation ( PVI ) is less than optimal in patients with persistent atrial fibrillation ( AF ) . Adjunctive techniques have been developed to enhance single-procedure efficacy in these patients . We conducted a study to compare 3 ablation strategies in patients with persistent AF . Methods and Results — Subjects were r and omized as follows : arm 1 , PVI + ablation of non-PV triggers identified using a stimulation protocol ( st and ard approach ) ; arm 2 , st and ard approach + empirical ablation at common non-PV AF trigger sites ( mitral annulus , fossa ovalis , eustachian ridge , crista terminalis , and superior vena cava ) ; or arm 3 , st and ard approach + ablation of left atrial complex fractionated electrogram sites . Patients were seen at 6 weeks , 6 months , and 1 year ; transtelephonic monitoring was performed at each visit . Antiarrhythmic drugs were discontinued at 3 to 6 months . The primary study end point was freedom from atrial arrhythmias off antiarrhythmic drugs at 1 year after a single-ablation procedure . A total of 156 patients ( aged 59±9 years ; 136 males ; AF duration , 47±50 months ) participated ( arm 1 , 55 patients ; arm 2 , 50 patients ; arm 3 , 51 patients ) . Procedural outcomes ( procedure , fluoroscopy , and PVI times ) were comparable between the 3 arms . More lesions were required to target non-PV trigger sites than a complex fractionated electrogram ( 33±9 versus 22±9 ; P<0.001 ) . The primary end point was achieved in 71 patients and was worse in arm 3 ( 29 % ) compared with arm 1 ( 49 % ; P=0.04 ) and arm 2 ( 58 % ; P=0.004 ) . Conclusions — These data suggest that additional substrate modification beyond PVI does not improve single-procedure efficacy in patients with persistent AF . Clinical Trial Registration — URL : http://www . clinical trials.gov . Unique identifier : NCT00379301 BACKGROUND The ideal management of patients with newly diagnosed symptomatic atrial fibrillation ( AF ) remains unknown . Current practice guidelines recommend a trial of antiarrhythmic drugs ( AAD ) prior to considering an invasive ablation procedure . However , earlier ablation offers an opportunity to halt the progressive patho-anatomical changes associated with AF , as well as impart other important clinical benefits . OBJECTIVE The aim of this study is to determine the optimal initial management strategy for patients with newly diagnosed , symptomatic atrial fibrillation . METHODS / DESIGN The EARLY-AF study ( Clinical Trials.govNCT02825979 ) is a prospect i ve , open label , multicenter , r and omized trial with a blinded assessment of outcomes . A total of 298 patients will be r and omized in a 1:1 fashion to first-line AAD therapy , or first-line cryoballoon-based pulmonary vein isolation .  Patients with symptomatic treatment naïve AF will be included . Arrhythmia outcomes will be assessed by implantable cardiac monitor ( ICM ) . The primary outcome is time to first recurrence of AF , atrial flutter , or atrial tachycardia ( AF/AFL/AT ) between days 91 and 365 following AAD initiation or AF ablation . Secondary outcomes include arrhythmia burden , quality of life , and healthcare utilization . DISCUSSION The EARLY-AF study is a r and omized trial design ed to evaluate the optimal first management approach for patients with AF . We hypothesize that catheter ablation will be superior to drug therapy in prevention of AF recurrence Background —Atrial  fibrillation ( AF ) ablation  is increasingly used in clinical practice . We aim ed to study the natural history and long-term outcomes of ablated AF . Methods and Results —We followed 831 patients after pulmonary vein isolation ( PVI ) performed in 2005 . We documented clinical outcomes using our prospect i ve AF registry with most recent up date on this group of patients in October 2009 . In the first year after ablation , 23.8 % had early recurrence . Over long-term follow-up ( 55 months ) , only 8.9 % had late arrhythmia recurrence defined as occurring beyond the first year after ablation . Repeat ablations in patients with late recurrence revealed conduction recovery in at least 1 of the previously isolated PVs in all of them and right-sided triggers with isoproterenol testing in 55.6 % . At last follow-up , clinical improvement was 89.9 % ( 79.4 % arrhythmia-free off antiarrhythmic drugs and 10.5 % with AF controlled with antiarrhythmic drugs ) . Only 4.6 % continued to have drug-resistant AF . It was possible to safely discontinue anticoagulation in a substantial proportion of patients with no recurrence in the year after ablation ( CHADS score ⩽2 , stroke incidence of 0.06 % per year ) . The procedure-related complication rate was very low . Conclusions —Pulmonary vein isolation is safe and efficacious for long-term maintenance of sinus rhythm and control of symptoms in patients with drug-resistant AF . It obviates the need for antiarrhythmic drugs , negative dromotropic agents , and anticoagulants in a substantial proportion of patients AIMS The urge to facilitate the atrial fibrillation ( AF ) ablation procedure has led to the development of new ablation catheters specifically design ed as ' one-shot tools ' for pulmonary vein isolation ( PVI ) . The purpose of this study was to compare the efficacy , safety , and procedure times for two such catheters using different energy sources . METHODS AND RESULTS One hundred and ten patients , referred for ablation of paroxysmal or persistent AF , were r and omized to treatment with either the cryoballoon or the circular multipolar duty-cycled radiofrequency-based pulmonary vein ablation catheter ( PVAC ) .  Complete PVI was achieved in 98 vs. 93 % patients in the cryoballoon and PVAC group , respectively , with complication rates of 8 vs. 2 % ( P = 0.2 ) . Complete freedom from AF , without antiarrhythmic drugs , after one single ablation procedure was seen in 46 % in the cryoballoon vs. 34 % after 12 months ( P = 0.2 ) . Procedure times were comparable , but fluoroscopy time was shorter for the cryoballoon ( 32 ± 16 min ) than for the PVAC procedures ( 47 ± 17 min ) ( P < 0.001 ) . A significant improvement of quality of life ( QoL ) and arrhythmia-related symptoms was seen in both groups after ablation . CONCLUSION Both catheters proved comparably effective and safe in achieving acute PVI , apart from the shorter fluoroscopy times achieved with the cryoballoon . At follow-up , there was no statistically significant difference between the groups regarding freedom from AF and clinical success . The QoL increased to the same levels as for the general Swedish population in both groups Background Pulmonary vein isolation alone is ineffective in maintaining sinus rhythm in up to one third of patients with paroxysmal atrial fibrillation ( AF ) . We compared pulmonary vein antral isolation plus additional limited ablation along the inferoposterior left atrium and epicardially within the adjacent coronary sinus ( PVAI + CS ) to pulmonary vein antral isolation ( PVAI ) alone in patients with paroxysmal AF . Methods Forty-two consecutive patients with paroxysmal AF were prospect ively r and omized to PVAI vs. PVAI + CS . All patients were seen 3 , 6 , 12 , and 18 months after ablation and underwent 24-h ambulatory Holter monitoring . Results Following a single procedure , 17 out of 22 patients ( 77 % ) remained arrhythmia free off antiarrhythmic medication after PVAI at 18 months vs. 10 out of 20 ( 50 % ) after PVAI + CS ( p < 0.01 ) . After PVAI , three patients had recurrent paroxysmal AF , and two had atrial tachycardia , whereas after PVAI + CS , three patients had recurrent paroxysmal AF , and seven had atrial tachycardia . All patients in the PVAI + CS group with atrial tachycardia who underwent a second procedure were found to have peri-mitral macro-reentry as the underlying mechanism . Eighty-one percent of patients remained arrhythmia free off medication after 1.09 procedures in the PVAI group vs. 80 % after 1.35 procedures in the PVAI + CS group ( p < 0.01 ) . Conclusion The addition of limited ablation along the inferoposterior left atrium and within the adjacent coronary sinus to PVAI alone did not reduce the recurrence rate of paroxysmal atrial fibrillation and was associated with an increased rate of peri-mitral macro-reentrant atrial tachycardia BACKGROUND The aim of this prospect i ve study was to evaluate the recurrences of atrial fibrillation ( AF ) and flutter ( AFL ) after circumferential pulmonary vein ablation ( CPVA )  using repetitive long-term Holter recordings , and to evaluate the change in quality of life ( QoL ) , especially in patients with asymptomatic AF recurrences . METHODS A total of 149 patients with AF were followed up with 7-day Holter monitoring at 3 , 6 , and 12 months after CPVA .  We calculated the burden of AF/AFL defined as the percentage of time in AF/AFL , and patients with documented arrhythmia were divided into isolated symptomatic episodes of arrhythmia , mixed symptomatic/asymptomatic arrhythmia , or isolated asymptomatic arrhythmia . The QoL was analyzed with SF-36 question naires in patients with sinus rhythm after CPVA , and in patients with recurrence of symptomatic and asymptomatic arrhythmia , respectively . RESULTS Asymptomatic arrhythmia was observed in 44 % of the patients with documented arrhythmia at 12 months of follow-up . In patients with persistent AF , 63 % of the documented arrhythmia at 12 months of follow-up was asymptomatic and often persistent . In the subgroup of patients with asymptomatic arrhythmia , the QoL improved significantly in the physical scores , in contrast to patients with symptomatic arrhythmia who had unchanged or worsened QoL scores . CONCLUSIONS Asymptomatic arrhythmia is very common after AF ablation . Our data indicate that these patients improve their physical component of the QoL significantly , which may be considered a palliative success of treatment . We suggest that patients with asymptomatic AF recurrences are carefully evaluated before considering reablation . Repetitive rhythm monitoring after AF ablation is very important considering the postablation management of anticoagulant therapy OBJECTIVES This study sought to determine whether ablation of complex fractionated atrial electrograms ( CFAEs ) after antral pulmonary vein isolation ( APVI ) further improves the clinical outcome of APVI in patients with long-lasting persistent atrial fibrillation ( AF ) . BACKGROUND Ablation of CFAEs has been reported to eliminate persistent AF . However , residual pulmonary vein arrhythmogenicity is a common mechanism of recurrence . METHODS In this r and omized study , 119 consecutive patients ( mean age 60 + /- 9 years ) with long-lasting persistent AF underwent APVI with an irrigated-tip radiofrequency ablation catheter . Antral pulmonary vein isolation result ed in termination of AF in 19 of 119 patients ( Group A , 16 % ) . The remaining 100 patients who still were in AF were r and omized to no further ablation and underwent cardioversion ( Group B , n = 50 ) or to ablation of CFAEs in the left atrium or coronary sinus for up to 2 additional hours of procedure duration ( Group C , n = 50 ) . RESULTS Atrial fibrillation terminated during ablation of CFAEs in 9 of 50 patients ( 18 % ) in Group C. At 10 + /- 3 months after a single ablation procedure , 18 of 50 ( 36 % ) in Group B and 17 of 50 ( 34 % ) in Group C were in sinus rhythm without antiarrhythmic drugs ( p = 0.84 ) . In Group A , 15 of 19 patients ( 79 % ) were in sinus rhythm . A repeat ablation procedure was performed in 34 of 100 r and omized patients ( for AF in 30 and atrial flutter in 4 ) . At 9 + /- 4 months after the final procedure , 34 of 50 ( 68 % ) in Group B and 30 of 50 ( 60 % ) in Group C were in sinus rhythm without antiarrhythmic drugs ( p = 0.40 ) . CONCLUSIONS Up to 2 h of additional ablation of CFAEs after APVI does not appear to improve clinical outcomes in patients with long-lasting persistent AF AIMS Ablation of complex fractionated atrial electrograms ( CFAEs ) is a new approach for the treatment of atrial fibrillation ( AF ) . The purpose of the study was to assess the efficacy of CFAE ablation as a st and -alone strategy in patients with persistent AF and to compare it with a combined approach of CFAE ablation and pulmonary vein isolation ( PVI ) . METHODS AND RESULTS The study included 77 consecutive patients with persistent AF who underwent radiofrequency ( RF ) ablation of CFAE as a sole ablation procedure ( CFAE group , n = 23 patients ) or a combined approach of CFAE ablation and PVI ( CFAE plus PVI group , n = 54 patients ) . Procedures were guided by three-dimensional mapping systems . After the procedure , AF recurrences were evaluated with 7-day Holter recordings at 1 , 3 , and 6 months and every 6 months thereafter . Treatment failure was defined as > or=1 AF episode lasting > 30 s on Holter recordings during follow-up . After a mean follow-up time of 13 + /- 10 months , 2 of 23 patients ( 9 % ) with CFAE ablation and 22 of 54 patients ( 41 % ) with CFAE plus PVI were in sinus rhythm after a single ablation procedure without anti-arrhythmic medication ( P = 0.008 ) . CONCLUSION Ablation of CFAE as a st and -alone ablation strategy seems insufficient for the treatment of patients with persistent AF . Pulmonary vein isolation plus CFAE ablation significantly increases the mid-term success rate AIMS Catheter ablation and surgical Maze procedure are effective in treating atrial fibrillation ( AF ) patients . However , there is no study that compares the effect of circumferential pulmonary vein isolation ( CPVI ) combined with substrate ablation after valvular surgery and the concomitant Maze procedure for the treatment of AF in patients with rheumatic heart disease ( RHD ) . The aim of this study was to compare the effectiveness of CPVI combined with substrate modification and surgical Maze procedure using Saline-Irrigated Cooled-tip Radiofrequency Ablation ( SICTRA ) system for the treatment of long-lasting persistent AF in patients with RHD . METHODS AND RESULTS Between January 2006 and June 2008 , 99 patients with long-lasting persistent AF and RHD were r and omly assigned to undergo valvular operation and CPVI combined with substrate modification 6 months after the surgery ( Group A , 49 patients ) or valvualr operation and concomitant Maze procedure ( Group B , 50 patients ) . The mean follow-up periods were 15 ± 5 and 20 ± 8 months in Groups A and B , respectively . After one procedure , Group B had a significantly higher freedom from artial arrhythmias compared with Group A ( 82 % in Group B vs. 55.2 % in Group A , P < 0.001 ) . Fifteen patients in Group A underwent a redo procedure . Six patients in Group B underwent  catheter  ablation and four were treated successfully . The cumulative rates of sinus rhythm were 71 % in Group A and 88 % in Group B ( P < 0.001 ) . CONCLUSION The concomitant Cox Maze procedure using SICTRA is more effective than subsequent CPVI combined with substrate modification in treating patients with long-lasting persistent AF and RHD BACKGROUND Complex fractionated electrograms ( CFEs ) are continuous electrograms ( EGMs ) of very short cycle length ( CL ) representing substrate for atrial fibrillation ( AF ) perpetuation . Ablation of CFEs may result in AF slowing , termination , and prevention , but identifying them can be subjective . OBJECTIVE The purpose of this study was to prospect ively assess ( 1 ) whether an automated algorithm can identify CFE regions , ( 2 ) the acute effects of ablating these regions on AF , and ( 3 ) the long-term efficacy as an adjuvant strategy to pulmonary vein antrum isolation ( PVAI ) . METHODS Thirty-five patients ( three centers , 61 + /- 9 years , left atrium [ LA ] 43 + /- 9 mm , ejection fraction 53 % + /- 7 % ) with symptomatic paroxysmal ( n = 21 ) or persistent ( n = 14 ) AF were studied . A decapolar lasso ( 2-mm spacing ) was used for mapping . A three-dimensional shell of the LA and pulmonary veins ( PVs ) was created . If not already in AF , AF was induced by burst pacing ( with or without isoproterenol ) . Atrial EGMs during AF were mapped/analyzed using an automated CFE algorithm . The algorithm measures the time between discrete deflections in a local EGM over 5 seconds ( based on selectable width and peak-to-peak [ > 0.03 mV ] criteria ) . The mean CL of the local EGM is projected onto the LA shell as a color-coded display . Regions of CL < 120 ms ( published criteria ) were targeted for ablation/elimination . Atrial fibrillation cycle length ( AFCL ) and regularity were measured from the CS . After CFE ablation , further ablation was done to achieve complete PVAI . RESULTS AF was spontaneous ( n = 20 ) or induced ( n = 15 ) in all patients . CFEs were most commonly found along the septum ( 97 % ) , anterior LA ( 97 % ) , PV antra ( 83 % ) , base of appendage ( 83 % ) , and annulus ( 71 % ) . CFE ablation alone prolonged the AFCL ( 171 + /- 27 vs. 304 + /- 41 ms ; P = .03 ) and regularized AF to left/right flutter ( AFL ) in 74 % of patients . CFE ablation terminated AF/AFL in 19 patients (54%)-the other 16 were cardioverted- and AF became noninducible in 77 % . CFE ablation alone did not cause PV isolation ( 0.1 + /- 0.3 PV isolated/patient ) . After combined CFE and PVAI ablation , the single-procedure , off-drug success rate was 83 % ( follow-up 13 + /- 4 months ) versus 71 % in matched controls who had PVAI alone ( P = .045 ) . CONCLUSIONS CFE ablation guided by an automated algorithm result ed in AFCL prolongation , regularization , and noninducibility in most patients . AF terminated in 54 % of cases . PVAI with adjuvant CFE ablation has a high efficacy and may be superior to PVAI alone Background — Pulmonary vein ( PV ) isolation is a promising new treatment for  atrial fibrillation ( AF ) . We hypothesized that isolation of large areas around both ipsilateral PVs with verification of conduction block is more effective than the isolation of each individual PV . Methods and Results — A total of 110 patients , 67 with paroxysmal AF and 43 with persistent AF , were r and omly assigned to undergo either isolation of each individual PV or isolation of large areas around both ipsilateral PVs . The isolation of each individual PV was an electrophysiologically guided , ostial segmental ablation with a 64-pole basket catheter or a 20-pole circular mapping catheter ( group I ) . Isolation of large areas was performed around the 2 ipsilateral veins with a nonfluoroscopic navigation system and a circular 20-pole mapping catheter for verification of conduction block ( group II ) . In both groups , an irrigated-tip ablation catheter ( 25 to 35 W ) was used to achieve complete isolation . Procedure and ablation times were longer in group II , whereas fluoroscopic time was significantly shorter ( P≤0.001 ) . After a follow-up period of 15±4 months , 27 patients in group I ( 49 % ) and 37 patients in group II ( 67 % ) remained free of symptoms of AF and had no AF or atrial flutter during repetitive Holter monitoring without antiarrhythmic drug treatment after a single procedure ( P≤0.05 ) . Conclusions — The rate of success was significantly higher and fluoroscopy times were significantly lower in the group with large isolation areas around both ipsilateral PVs than in those who underwent individual PV isolation BACKGROUND Atrial fibrillation ( AF ) is the most common sustained cardiac arrhythmia imposing substantial morbidity and mortality . Catheter-based pulmonary vein isolation ( PVI ) using radiofrequency current ( RFC ) has become a st and ard treatment for drug-resistant and symptomatic paroxysmal AF ( PAF ) . In recent years , the cryoballoon-based technique is increasingly used as a promising alternative with a short learning curve . METHODS The FIRE AND ICE trial is a prospect i ve , r and omized , controlled , open , blinded outcome assessment , noninferiority trial comparing cryoballoon- , and RFC-based PVI .  Patients with drug-resistant PAF will be r and omized in a 1:1 matrix in multiple European centers . The primary hypothesis is that cryoballoon ablation is not inferior to RFC ablation using 3-dimensional mapping with respect to clinical efficacy . The primary endpoint is defined as the time to first documented clinical failure , including : ( 1 ) recurrence of AF ; ( 2 ) atrial flutter or atrial tachycardia ; ( 3 ) prescription of class I or III antiarrhythmic drugs ; or ( 4 ) re-ablation , whichever comes first , following a blanking period of 3 months after the index ablation procedure . The primary safety endpoint is a composite of death , stroke/transient ischemic attack , cardiac arrhythmias ( apart from AF recurrence ) causally related to the therapeutic intervention , and procedure-related serious adverse events . CONCLUSION The FIRE AND ICE trial compares 2 different technologies to perform catheter ablation of PAF with respect to efficacy and safety . It aims at providing objective data to guide selection and usage of ablation catheters in the treatment of AF INTRODUCTION Pulmonary vein isolation ( PVI ) is an established treatment for paroxysmal atrial fibrillation ( AF ) . The ablation of complex fractionated atrial electrograms ( CFAE ) has emerged as a novel treatment approach . We sought to evaluate the additional effect of CFAE ablation to PVI in paroxysmal AF . METHODS AND RESULTS Ninety-eight patients with paroxysmal AF ( 57 + /- 10 years , 74 male ) were r and omized to the PVI ( n = 48 ) or PVI + CFAE group ( n = 50 ) . After PVI , CFAE ablation was performed in patients with inducible AF in the PVI + CFAE group . The primary endpoint was combined objective ( 7-day Holter ECG ) and subjective ( symptoms ) freedom of atrial tachyarrhythmia 3 months after ablation . Long-term follow-up ( 19 + /- 8 months ) was available in 94 of 98 patients . CFAE ablation was performed in 30 of 50 patients of the PVI + CFAE group . After 3 months , 36 of 48 patients ( 75 % ) in the PVI group and 38 of 50 patients ( 76 % ) in the PVI + CFAE group were in stable sinus rhythm ( P = NS ) . During long-term follow-up ( 19 + /- 8 months ) , 34 of 46 patients ( 74 % ) in the PVI group and 40 of 48 patients ( 83 % ) in the PVI + CFAE group were in sinus rhythm ( P = 0.08 ) . In a subgroup analysis , a significantly better long-term outcome was achieved if inducible AF after PVI had been treated by additional CFAE ablation as compared with PVI only ( sinus rhythm in 25/28 patients ; 89 % vs 22/30 patients 73 % ; P = 0.003 ) . CONCLUSION In the intention-to-treat analysis , additional CFAE ablation did not improve the success rate of PVI in patients with paroxysmal AF . However , during long-term follow-up , patients with still inducible AF after PVI seemed to profit from additional CFAE ablation
There is limited evidence to suggest which ablation method was the best .
There is limited evidence to suggest that CA may be a better treatment option compared to medical therapies in the management of persistent AF .
This review was also unable to recommend the best CA method
BACKGROUND Atrial fibrillation ( AF ) is the most common cardiac arrhythmia seen in cardiovascular departments .
Treatments include medical interventions and catheter ablation .
Due to uncertainties in medical therapies for AF , and the need to continue sinus rhythm , ablation has been recently considered as a viable alternative .
Many new ablation methods based on pulmonary vein isolation ( PVI ) have been developed .
OBJECTIVES The primary objective of this review was to assess the beneficial and harmful effects of  catheter ablation ( CA ) in comparison with medical treatment in patients with paroxysmal and persistent AF .
The secondary objective was to determine the best regimen of CA .