15 year old passing out and sweating bad with heart beat at 57 ?

Dysrhythmia: At age 15, ischemia or clogging not a problem unless with really bad predisposing factors. Passing out is a bad sign. This person should see his/her doctor and have good exam done, ekg, and perhaps even holder and eps if needed as it has been happening with many kids lately who are even athletic. A good history, family history and events should be prepared.