Ventricular tachycardia
Ventricular tachycardia is a very rapid heartbeat. It occurs in the lower chambers of the heart, the ventricles. Tachycardias differ from tachyarrhythmias in that in the first the heart is perceived fast but always rhythmic, whereas in tachyarrhythmias the heart is also perceived fast, but the pulse is arrhythmic, not regular. Although all tachyarrhythmias are abnormal, not all tachycardias are clearly differentiated between a reactive physiological sinus tachycardia, which can be perceived after an emotion, physical exercise, etc.