Tachycardia: Many factors. Normal - regular 60-100bpm. Normally sinus node HR is 60-100; junctional 70-110; ventricular ~ 36 bpm. Any abn focus can lead to irregular rhythms such as A.fib/flutter, sinus tahcycardia, ventricualr tachycardia to name a few. Abnormal cardiac focus - Afib; metabolic/endocrine - thyroid, infections; CA; substance abuse; anxiety; congenital abn are some.
Answered 11/13/2014
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