Re-entry ventricular arrhythmia, also known as ventricular tachycardia, is a type of heart rhythm disorder that can be life-threatening if left untreated. There are several synonyms used to describe this condition, including: 1. Ventricular fibrillation - a chaotic and disorganized heart rhythm that prevents the heart from pumping blood effectively. 2. Idiopathic ventricular tachycardia - a type of ventricular tachycardia that occurs without an apparent cause. 3. Polymorphic ventricular tachycardia - a type of ventricular tachycardia that causes the heart rate to change in a erratic manner. 4. Sustained ventricular tachycardia - a form of ventricular tachycardia that lasts longer than 30 seconds.