Electrical signal can be focal or reentrant when starting in the ventricle
Ventricular tachycardia happens when there is abnormal automaticity
Ventricular pacemaker cells are out of sync with the SA node
Ventricular tachycardia is more common as reentrant
Refractory period is after conducting a signal when cells can not conduct another signal
Ventricular tachycardia may result into ventricular fibrillation and turn into cardiac arrest
Seconds may be harmless, but longer periods are dangerous
Heart attacks may cause scar tissue
Scar tissue can not conduct signals well
Monomorphic ventricular tachycardia is commonly caused by scar tissue
Monomorphic ventricular tachycardia is commonly associated with re-entrant circuits
Polymorphic ventricular tachycardia is most commonly caused by abnormalities of ventricular muscle repolarization
Polymorphic ventricular tachycardia indicates the shapes changes with each beat
Polymorphic ventricular tachycardia signals originate from different points in the ventricles