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) 
heart beats fast  may pump blood rest body  organs tissues may oxygen  signs symptoms occur episode ventricular tachycardia due lack oxygen may include:  chest pain (angina) dizziness pounding heartbeat (palpitations) lightheadedness shortness breath  ventricular tachycardia may away 30 seconds (nonsustained v-tach) last 30 seconds (sustained v-tach vt)  brief episodes may cause symptoms  sustained vt can cause problems  including: v-tach v-tach vt vt  fainting loss consciousness cardiac arrest (sudden death) 
ventricular tachycardia