PR Interval and the Risks of Recurrent Syncope and All‐Cause Mortality in Patients Presenting With Syncope

Background Risk assessment of patients with syncope does not consider a short PR interval despite its association with increased risk of atrial fibrillation and all‐cause mortality. This study aimed to explore the association between the PR interval and all‐cause mortality and recurrent syncope in patients admitted to the hospital with syncope. Methods We included patients with a diagnosis of syncope and an ECG recorded within 24 hours of hospital admission from the Danish Nationwide Electrocardiogram Cohort and divided patients into short (200 ms). Patients with ECG abnormalities or comorbidities influencing the PR interval or outcomes were excluded. Results A total of 52 038 patients were included. Adjusting for age, sex, and relevant covariates the highest hazard ratio (HR) was observed in patients with short PR interval with an HR of 1.50 (95% CI, 1.24–1.80, P