It is a life-threatening heart rhythm that results in a rapid, inadequate heartbeat. It is because the heart doesn't pump appropriate amount of blood during ventricular fibrillation, sustained VF can cause low blood pressure, loss of consciousness and lead to death also. Emergency treatment constitutes an immediate defibrillation along with an automated external defibrillator (AED) and cardiopulmonary resuscitation (CPR). It could be diagnosed by ECG, Blood tests. Chest X-ray., Echocardiogram. Coronary catheterization (angiogram), computerized tomography (CT), Magnetic resonance imaging (MRI). It is considered the most serious cardiac rhythm disturbance. Disordered electrical activity causes the heart's lower chambers. Cardiopulmonary resuscitation (CPR) must be started within a few minutes, and it must be followed by defibrillation (an electrical shock delivered to the chest) to restore normal heart rhythm. People develop irreversible brain damage after about 5 minutes because oxygen no longer reaches the brain. Death soon follows. When the heart beats with a normal rhythm, electricity flows from the top of the heart to the bottom of the heart, causing the heart muscle to contract and moving the blood through the body. In A Fib, the electricity flows chaotically and the bottom chambers of the heart contract irregularly. One of the hallmarks, AFib symptoms is this so-called fluttering or fibrillation.