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Ventricles
The left and right ventricles are the main pumping chambers of the heart. They receive blood from the left and right atria, and pump it to the body and the lungs.
Ventricular fibrillation (VF)
An arrhythmia causing an abnormally rapid and irregular beating of the ventricles. Because the heart pumps little or no blood, this arrhythmia is fatal unless a shock is given (defibrillation) to restore normal rhythm.
Ventricular tachycardia (VT)
An arrhythmia causing an abnormally rapid but regular beating of the ventricles. This can cause anything from mild symptoms of dizziness to fainting. If untreated ventricular tachycardia can lead to ventricular fibrillation.