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Supraventricular tachycardia (SVT) refers to the conditions associated with episodes of fast heartbeat occurring due to the problems of electrical activity in the upper chambers of the heart. A normal heart usually beats at the rate of 60 to 100 beats per minute. When the heart rate is more than 100, it is known as tachycardia. An episode of SVT can make the heart beat at the rate of 150-220 beats per minute. Your heartbeat may be so fast that it won't allow the heart to be filled with blood, resulting in insufficient blood supply to the body. You may feel palpitation, lightheadedness, faintness, shortness of breath, sweating, and/or chest pain.