<unk>  <unk>  or<unk>  is an abnormal heart rhythm in which the ventricles of the heart quiver. It is due to disorganized electrical activity.<unk>  results in cardiac arrest with loss of consciousness and no pulse. This is followed by death in the absence of treatment.<unk>  is initially found in about 10% of people with cardiac arrest.<unk>  can occur due to coronary heart disease, valvular heart disease, cardiomyopathy, Brugada syndrome, long QT syndrome, electric shock, or intracranial hemorrhage. Diagnosis is by an electrocardiogram (ECG) showing irregular unformed QRS complexes without any clear P waves. An important differential diagnosis is torsades de pointes. Treatment is with cardiopulmonary resuscitation (CPR) and defibrillation. Biphasic defibrillation may be better than monophasic. The medication epinephrine or amiodarone may be given if initial treatments are not effective. Rates of survival among those who are out of hospital when the arrhythmia is detected is about 17% while in hospital it is about 46%.
Ventricular fibrillation
Torsades de pointes
Ventricular flutter
Sinus arrhythmia
Sinoatrial arrest
Ventricular tachycardia
Pre-excitation syndrome
Primary ventricular fibrillation