Degree AV Block and Atrial Fibrillation

Drugs prolonging AV conduction time, such as Beta Blockers Congenital heart disease Fibrosis of the conduction system Acute MI 

There is one incidence where AF may appear regular rather than irregularly irregular and this is in the presence of 3rd degree AV block. No P waves are visible and the characteristic undulating chaotic baseline of AF can be seen but with a regular ventricular rhythm (Fig. 7.12). 

Patients may require temporary pacing. If however the block is permanent a Permanent Pacemaker (PPM) system may be required. 

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Fig. 7.12 Quiz 7.7 Quiz 8.7 3rd degree AV block and atrial fibrillation...

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