Abnormal condition wherein damaged or diseased heart muscle within a ventricle begins contracting on its own, which it normally does not do.
a fast heart rhythm caused by abnormal electrical impulses or circuit within the ventricles
ventricular tachycardia: rapid heart beating that arises in the ventricles of the heart; symptoms include palpitations, rapid heart action, dizziness, lightheadedness, fainting or near fainting; can be treated with medications or by an implantable cardioverter/defibrillator.