Abstract Background The impact of performing a primary percutaneous coronary intervention (pPCI) off-hours on clinical outcomes is not well established. Objective Compare characteristics and major adverse cardiovascular events (MACE) of pPCI off-hours versus on-hours in a high-volume cardiology center. Methods Prospective cohort of patients who underwent pPCI for ST elevation myocardial infarction (STEMI) from 2009 to 2019. We defined off-hours pPCI as workdays from 8pm to 7:59 am as well as weekends and holidays. We compared patients treated on- and […]