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Supraventricular Tachycardia, SVT for short, can be present with a heart rate of 180/min or greater. SVT is caused by some sort of stimulus originating above the ventricles, as opposed to the normal stimulus generated by the SA node. Usually a patient with SVT has a history of vague or nonspecific symptoms or palpitations, along with a sudden onset. With SVT, the stimulus comes from a rogue myocardial cell that stimulates an erratic atrial contraction or a series of atrial contractions like those found in atrial fibrillation or atrial flutter. SVT can persist until medical intervention is offered or it can be intermittent and self limiting and come and go without warning. If the patient is hemodynamically unstable, such as hypotensive, rapid treatment must be given to correct the heart rhythm.