An 18 year old baseball player is hit in the chest by a regulation baseball at around 40 miles per hour and suffered cardiac arrest. He had no underlying heart disease and there was no structural damage to the chest wall, thoracic cavity, or heart itself.
Challenge: What happened?
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Sudden Cardiac Death
This is commotio cordis which is sudden cardiac death, usually due to arrhythmia (ventricular fibrillation) in young athletes following low-impact precordial trauma with a projectile object.
Source: UpToDate.
ahh, i'm trying not to read your comment...the baseball must have hit him during a period in his cardiac cycle to cause vfib...don't remember the terminology
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