Association Between Off-hour Presentations and In-hospital Mortality for Patients with Acute ST-Elevation Myocardial Infarction Treated with Primary Percutaneous Coronary Intervention.

Objectives: This study aimed to assess the effect of the admission time (on-hours versus off-hours) on in-hospital mortality in patients with ST-elevation myocardial infarction (STEMI) treated with primary percutaneous coronary intervention (PPCI) in a region without STEMI network.

Methods: We analysed in-hospital the mortality among 300 consecutive ST-segment elevation myocardial infarction (STEMI) patients treated with PPCI between March 2012 and February 2017. Patients were divided according to admission time into on-hours admission (08:00 AM until 08:00 PM on weekdays) versus off-hours admission (08:00 PM until 08:00 AM on weekdays and 24 h on weekends and holidays).