11.   Or a heart may suddenly start beating much too fast, a condition called ventricular tachycardia, and then lapse into ventricular fibrillation.

12.   One is called ventricular tachycardia.

13.   The doctors will stimulate the heart electrically, and possibly with drugs, to determine if they can induce an abnormal heart rhythm like sustained ventricular tachycardia.

14.   The Holter test showed that he had four separate episodes of a very rapid heart rhythm known as ventricular tachycardia that lasted up to two seconds.

15.   The short bursts of ventricular tachycardia might have occurred intermittently but gone undetected for years, or they might be a new development.

16.   Ventricular tachycardia, in turn, can lead to an even more serious condition, ventricular fibrillation.

17.   When three such contractions occur in succession, as in his case, doctors speak of ventricular tachycardia.

18.   A racing type of arrhythmia, called ventricular tachycardia, causes the bottom chambers of the heart to cycle so rapidly that they cannot fill properly between beats.

19.   Severe and sustained ventricular tachycardia can cause dizziness, fainting and death.