An annual workforce turnover is unique to health care, with a fresh academic cycle commencing at all teaching hospitals in Summer every year. New roles are assigned to members of the healthcare delivery team. This shift is thought to be deleterious, as the sudden decrease in the average experience of the staff can potentially harm patient care. If this hypothesis was true, the outcomes of patients admitted with a life-threatening condition would be worse during the summer months (July–September), coinciding with this mass exodus and change in the workforce. To study this, the authors compared the mortality and morbidity of patients with ST-segment elevation myocardial infarction (STEMI) admitted to teaching hospitals during the summer months, versus the rest of the year.