The disease of supraventricular tachycardia has a certain pattern of development: it becomes more prone to attacks, more frequent, and may last longer and longer after the attack, to the point where it may not respond to some previously effective termination modality or medication. Supraventricular tachycardia occurs due to the presence of extra conduction pathways (one or more) in the heart. In general, except for infants and children with supraventricular tachycardia who have some chance of self-healing, most patients are unlikely to experience self-healing after an episode of supraventricular tachycardia without surgery.