<unk>  is the most common type of syncope (fainting).  There are a number of different syncope syndromes which all fall under the umbrella of<unk> .  The common element among these conditions is the central mechanism leading to loss of consciousness.  The differences among them are in the factors which trigger this mechanism. You do not need to be bradycardic to have heightened vagal tone. Vagal episodes are common following procedures such as cardiac catheterization, and this chapter discusses the management of this complication.
Vasovagal syncope
Heat syncope
Defecation syncope
Neurocardiogenic syncope
Micturation syncope
Postural orthostatic tachycardia syndrome
Panic attack
Torsades de pointes