Pontoppidan 2009.

Methods	Block randomisation
Participants	149 paroxysmal and persistent AF patients aged 56+/‐8 years were enrolled. 73 were arranged to CPVA and CTIB group, and 76 patients were arranged to CPVA alone group. Age: 56 +/‐ 8 years in CTIB+ group, and 56 +/‐8 in CTIB‐ group. % of male: 74% in CTIB+ group, and 68% in CTIB‐ group. Follow‐up: 12 months. Location: Aarhus, Denmark.
Interventions	CPVA plus CTIB compared CPVA alone
Outcomes	Recurrence of AF
Notes	CTIB: cavotricuspid isthmus block.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Block randomisation.
Allocation concealment (selection bias)	Unclear risk	B‐Unclear. The authors did not depict allocation concealment method.
Blinding	High risk	The study was not blinded.
Incomplete outcome data addressed	High risk	There were no patients withdrawn or lost to follow up.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.