In everyday life, the patient's position may help you. If he is still standing, it is probably a supraventricular tachycardia. If he is unable to stand up or is even unconscious, it instantly makes a ventricular tachycardia much more likely. Since a ventricular tachycardia, or VT for short, is clearly more dangerous than a supraventricular tachycardia or SVT for short, a wide complex tachycardia is treated as VT until proven otherwise. Therefore, in this chapter, we will first explain the important aspects of VT.