One of the first reported<unk>  of paroxysmal AV<unk>  was secondary to mitral valvulitis, indicating an intrinsic conduction defect. A similar<unk>  was later seen in the Bundle of His, wherein during a hypothesized zone of opportunity, a spontaneous depolarization of conducting fibres was seen. Idiopathic paroxysmal AV<unk>  may be diagnosed by a positive response to adenosine triphosphate.
In 1931, Adolph Sachs et al reported one of the first<unk>  on paroxysmal AV<unk> . The patient had presented with multiple spells of palpitations, hot flashes, dizziness, ringing in the ears, weakness and diaphoresis accompanied by convulsions. During an acute episode, he noticed an irregular ventricular rhythm, irregular complexes and given a time interval of 30 seconds, the ventricle would beat once in the first 15 second window and 4-5 times in the succeeding window.  It was noticed that the duration of the<unk>  progressively increased until it was present all the time. Mitral valvulitis was put down as the cause of the attack and the fact that a response to atropine does not rule out an intrinsic conduction defect was emphasized. "Paroxysmal complete auriculo-ventricular heart-block: A<unk> report - ScienceDirect".
In 1972, Philippe Coumel et al hypothesized that the cause of bradycardia/pause dependent AV<unk>  was the spontaneous depolarization of specialized conducting fibers in the late stages of diastole. It was during this ‘zone of opportunity’ that they noticed this ‘AV dissociation’. In this<unk>  they found that the<unk>  occurred to be proximal to the division of the His bundle.
In 1997. Brignole et al first described EI AVB in a group of 15 syncope patients with an initial negative work up. They fortuitously stumbled upon ECG findings indicating a paroxysmal AV<unk>  and reconfirmed this by performing an adenosine triphosphate test in each patient. 
CS1 maint: Multiple names: authors list
Paroxysmal AV Block Famous cases
Paroxysmal AV Block EKG examples
Atrial flutter risk factors
Catecholaminergic polymorphic ventricular tachycardia risk factors
Pulseless ventricular tachycardia risk factors
Atrioventricular block other diagnostic studies
First degree AV block other diagnostic studies
Second degree AV block other imaging findings