Drugs for AV Block

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Chapter: Essential pharmacology : Antiarrhythmic Drugs

Atropine: When AV block is due to vagal overactivity, e.g. digitalis toxicity, some cases of MI; it can be improved by atropine 0.6–1.2 mg i.m. Atropine abbreviates AV node ERP and increases conduction velocity in bundle of His.


DRUGS FOR AV BLOCK

 

Atropine: When AV block is due to vagal overactivity, e.g. digitalis toxicity, some cases of MI; it can be improved by atropine 0.6–1.2 mg i.m. Atropine abbreviates AV node ERP and increases conduction velocity in bundle of His.

 

Sympathomimetics (Adr, isoprenaline): These drugs may overcome partial heart block by facilitating AV conduction and shortening ERP of conducting tissues.

 

They may also be used in complete (3rd degree) heart block to maintain a sufficient idioventricular rate (by increasing automaticity of ventricular pacemakers) till external pacemaker can be implanted.

 

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