Many causes: Most if not all are reversible with right diagnosis ; treatment.
Answered 11/15/2013
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Fast heart rate: Tachycardia simply means fast heart rate. This could be normal/physiologic response. Abnormally elevated heart rates should be evaluated. This may be related to underlying rhythm abnormalities or signs of systemic diseases e.g. Thyroid dysfunction, etc.
Answered 3/5/2021
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