OutcomesPatients were followed up until hospital discharge. The primary outcome was a composite of ventricular arrhythmia or cardiac arrest that developed during hospital stay and postadmission based on ICD-10-CA codes (eTable 1 in Supplement 1). This definition excluded ventricular premature depolarization, other premature depolarization, and unspecified cardiac arrhythmias. The exact date for the occurrence of the primary outcome was not recorded, so time-to-event analysis was not possible. The secondary outcome was all-cause in-hospital mortality.