Complete AV dissociation is a broad term referring to any arrhythmia where the atria and ventricles contract independently of each other. It can be caused by AV block or the ventricles beating too fast such that atrial signals fall within their refractory period. On ECG, P waves and QRS complexes are completely dissociated with no relationship. The underlying rhythm in complete AV dissociation may be ventricular tachycardia, junctional tachycardia, accelerated junctional rhythm, accelerated ventricular rhythm, or complete AV block.

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Complete AV
Dissociation
-Causes

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Complete AV Dissociation
 It is a much broader term that includes any arrhythmia in which
the atria and ventricles are completely independent.
 It’s not necessarily due to only AV block

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Mechanism
 Ventricles beats faster so that when sinus signals come they are
in the refractory period – no conduction of the signal
 AV block

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ECG Findings
1. P waves and QRS complexes are completely dissociated and
have no relation.
2. In complete AV dissociation, the underlying rhythm may be
ventricular tachycardia, junctional tachycardia, accelerated
junctional rhythm, accelerated ventricular rhythm or complete
AV block.

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Types of complete AV dissociation
1. Complete AV block
2. Ventricular tachycardia with complete AV dissociation
3. Accelerated idioventricular rhythm with complete AV
dissociation
4. Junctional tachycardia with complete AV dissociation
5. Junctional rhythm with complete AV dissociation

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