Assessment and initial management of the collapsed endurance athlete

Participation in endurance events such as marathons is increasingly popular. Those taking part in these events may collapse and require medical attention for a range of reasons, some of which are well known and recognised by prehospital providers. However, there are conditions that are specific to endurance exercise which may be less well known so potentially less likely to be recognised and managed appropriately. The most common cause of collapse in the endurance athlete is exercise-associated collapse. However, practitioners should be vigilant regarding life-threatening differentials such as exertional heatstroke and exercise-associated hyponatraemia, which are not uncommon. Identifying the cause of collapse in the endurance athlete is difficult as clinical presentations are often similar. The causes, symptoms and management of these conditions are discussed and a management algorithm proposed.