Heart rate variability in concussed athletes: A case report using the smartphone electrocardiogram

Key Teaching Points • Concussions are a subset of mild traumatic brain injuries that typically result in transient impairment of neurological function, with or without loss of consciousness. Better recognition of their presentation and prevalence has increased awareness of the risk of concussions in active individuals. • Changes in heart rate variability could reflect changes in autonomic tone that often accompanies concussion. • The smartphone electrocardiogram could provide an accessible means of assessing heart rate variability in concussed individuals.