Symptoms of Supreventricular Tachycardia also know as SVT can come on suddenly and can go away without treatment. Episodes of SVT are caused for a reason other than stress, exercise or emotion. They can last a few minutes or as long as 1 or 2 days, sometimes continuing until treated. The rapid beating of the heart during SVT can make the heart a less effective pump so that the cardiac output is decreased and the blood pressure drops. The following symptoms are typical with a rapid pulse of 150–251 beats per minute: Pounding chest Shortness of breath Chest pain Rapid breathing Dizziness Loss of consciousness (in serious cases) Numbness of various body parts If you have SVT this group is for you.