Ventricular tachycardia can occur spontaneously.
It may be a result of scar tissue formed after an earlier heart attack, or an undesired effect of antiarrhythmic drugs. Torsade de pointes is a form of ventricular tachycardia with characteristic variation in the conduction of the ventricular stimulus. Ventricular tachycardia occurs in approximately 2 out of 10,000 people. In some cases, the disorder is not preventable. In other cases, treatment of underlying cardiac disorders, correction of blood chemistries , and correction of pH and oxygenation problems may prevent ventricular tachycardia.