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. 2012 Apr 18;2012(4):CD007101. doi: 10.1002/14651858.CD007101.pub2

Arentz 2007.

Methods Randomised controlled trial
Participants Inclusion criteria: consecutive patients with highly symptomatic, drug‐refractory paroxysmal or persistent episodes of AF. 110 patients were included and assigned into two groups evenly.
Age: 56+/‐10 years in small isolation area group, and 55+/‐10 years in large isolation area. 
 % of male: 39/55 (70.9%) in small isolation area group and 44/55 (80%) in large isolation group. 
 Follow‐up: 15+/‐4 months.
Location: Herz‐Zentrum, Bad Krozingen, Germany.
Interventions Small area of PV ablation compared with large area of PV ablation.
Outcomes Success rate, recurrence of AF, complications
Notes PV: Pulmonary vein.
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Incomplete outcome data addressed High risk There were no patients withdrawn or lost to follow up.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 B‐Unclear. The authors did not depict adequate sequence generation.