When the heart beats too fast, it may not pump enough blood to the rest of the body. So the organs and tissues may not get enough oxygen. Signs and symptoms that occur during an episode of ventricular tachycardia are due to a lack of oxygen and may include: 
Chest pain (angina)
Dizziness
Pounding heartbeat (palpitations)
Lightheadedness
Shortness of breath
 Ventricular tachycardia may go away on its own within 30 seconds (nonsustained V-tach) or last more than 30 seconds (sustained V-tach or VT). Brief episodes may not cause any symptoms. But sustained VT can cause serious problems, including: V-tach V-tach VT VT 
Fainting
Loss of consciousness
Cardiac arrest (sudden death)
