Carrero JJ, et al. - Researchers investigated the effect of incident atrial fibrillation on stroke risk among 116,184 adults with chronic kidney disease (CKD; estimated glomerular filtration rate <60 mL/min/1.73 m²) without previously documented atrial fibrillation who had been in contact with health care in Stockholm, Sweden during the period of 2006–2011. In outpatient or inpatient care, incident atrial fibrillation was identified by administrative diagnostic codes and treated as a time-updated exposure in the analysis of stroke and death risk. During a mean follow-up of 3.9 years (interquartile range, 2.3–5.7 years), clinically recognized atrial fibrillation developed in 13,412 (12%) adults. Findings revealed a higher risk of stroke and death among these patients with CKD.