SVT is abnormal: Sinus rhythm is normal pacemaker activity in the heart. Tachycardia means the heart rate is going fast. SVT stands for "supra ventricular tachycardia", which is an abnormal fast heart rhythm, that can cause symptoms of palpitations, dizziness, shortness of breath, or chest pain. Sinus tachycardia is thus a fast heart beat in response to your bodies natural signals. See EP cardiologist for svt.
Answered 4/7/2016
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