Long-term Recurrence Rates of Atrial Fibrillation Following New-onset Atrial Fibrillation During ICU Admission

The Primary Objective of the study is to establish the One-year recurrence rates of atrial fibrillation (AF) following new-onset atrial fibrillation during intensive care unit (ICU) admission. The Secondary Objective is a composite of death from cardiovascular causes, stroke (either ischemic or hemorrhagic), or hospitalization with worsening of heart failure or recurrent AF. The prevalence and recurrence rates of AF will be divided into sub-groups based on primary ICU admission diagnosis. All-cause mortality.