<unk>  tachycardia is a collective term used to describe all the tachycardias originating from the SA node, atrium and AV node.  Therefore, the causes depend on the source of the pathology, and they are as follows:
Supraventricular tachycardia causes
Sinoatrial arrest causes
Inappropriate sinus tachycardia causes
Left bundle branch block causes
Third degree AV block causes
Sinus tachycardia causes
Atrial flutter causes
Wide complex tachycardia causes