Mazza A, Bendini MG, Valsecchi S, et al. - A total of 150 consecutive patients who underwent implantation of a dual-chamber pacemaker, capable of sleep apnea (SA) and standard deviation of 5-min median atrial–atrial sensed intervals (SDANN) estimation, were recruited in a study by the researchers to assess the correlation between the occurrence of atrial fibrillation (AF) and device-detected SA and SDANN. AF occurred in 24 patients during follow-up. In 84 patients, severe SA was noted. In 74 individuals, SDANN values were available, and the median value was 76 ms. In individuals with severe SA, the risk of AF was higher, according to findings. The presence of either or both conditions was correlated with shorter time to AF event and was an independent predictor of AF. Overall, device-diagnosed severe SA and decreased SDANN were related to a higher risk of AF in patients with pacemakers.