In this issue of CHEST (see page 1277), Bazan and colleagues1 examine the link between obstructive sleep apnea (OSA) and recurrent atrial arrhythmias in patients undergoing catheter ablation for the treatment of typical right atrial flutter (AF). All subjects underwent a sleep-study evaluation after a cavotricuspid isthmus ablation; 82% had OSA. CPAP was initiated in those with the highest apnea-hypopnea index (AHI), involving about one-half of the patients. Atrial fibrillation (AFib) was noted in 38% of patients during follow-up in the first year postablation, with less than one-half being “new” diagnoses of AFib. The authors demonstrated that CPAP treatment of OSA did not reduce the overall AFib rate but was associated with lower rates of new-onset AFib in these patients postablation.