Depends: "abnormal heartbeat" covers a lot of ground. Virtually everyone has some "extra" (technically premature) beats which are harmless but can be annoying. Very rapid rhythms (>200) can cause dizziness. Very slow rhythms (with > 5 second pauses) can cause blackouts. The most dangerous rhythms occur during or after a heart attack which, at 16, is not a concern for you.
Answered 5/2/2013
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