Supraventricular Tachycardia (ECG Rhythm Interpretation)
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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.
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