Oral 2004.

Methods	Randomised controlled trial
Participants	Inclusion criteria: inducible by atrial pacing in the baseline state who underwent LACA for symptomatic, drug‐resistant, paroxysmal AF. Age: 55+/‐11 years in posterior left atrium and mitral isthmus ablation group (group 2), and 56+/‐9 years in additional ablation lines along the left atrial septum, roof and/or anterior wall (group 3). % of male: 24/30 (80%) in group 2, and 26/30 (87%) in group 3. Follow‐up: 8+/‐2 months. Location: Ann Arbor, Michigan.
Interventions	100 patients were included and received left atrium circumferential ablation (LACA). 40 patients were cured and the remaining 60 patients were randomly arranged into no further ablation group (group 2, n=30) and additional linear ablation group (group 3, n=30).
Outcomes	Recurrence of AF, sinus rhythm remaining, complications
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Insufficient detail was provided.
Allocation concealment (selection bias)	Unclear risk	B‐Unclear. The authors did not depict allocation concealment method.
Blinding	High risk	Blinding was not reported.
Incomplete outcome data addressed	High risk	There were no patients withdrawn or lost to follow up.
Adequate sequence generation	Unclear risk	It was not addressed.