Leveraging electronic health records for atrial fibrillation cohort generation

(1) Discharge reports are a valuable resource for automatic cohort selection, with both the rule-based method and LLMs showing promising results. (2) While LLMs struggled with long-context inputs, they handled temporal reasoning well when explicit dates were provided. (3) Larger models did not always outperform smaller ones, (4) prompt language strongly influenced performance, and medical model variants were not consistently superior.