An athlete who collapses and is unresponsive and not breathing normally is in cardiac arrest until proven otherwise: call 999, start cardiopulmonary resuscitation (CPR) and use a defibrillator early.
The causes range from the immediately fatal to the trivial, and the first seconds decide the outcome. This page is the structured survey for sorting a collapse as it happens. Assessment and treatment run together, and the survey stops to treat the first life threat it finds. Once cardiac arrest is recognised, management follows the Sudden Cardiac Arrest page.
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