A systematic review with 1,308 patients (23 studies) reported acute procedural success (defined as complete isolation of all targeted pulmonary veins) in 99% (95% confidence interval [CI] 98 to 99) of patients (19 studies; n=924; I2=0% [no heterogeneity]; timing of assessment unclear). A comparative case series of 94 patients treated by balloon cryoablation (n=30), radiofrequency ablation (n=29) or robotically assisted radiofrequency ablation (n=35) reported procedure success (defined as 'no atrial tachyarrhythmias [symptomatic or asymptomatic] lasting ≥30 seconds, identified on surface electrocardiogram [ECG], Holter monitoring or 7-day ECG recording') without anti-arrhythmic drugs in 66% (23), 66% (19) and 67% (20) of patients respectively at a mean follow-up of 13 months (p=0.625; denominator not reported).