doc4life
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What is the effect of carotid sinus pressure and atropine on 2nd degree AV block?
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| filiz
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Second-degree atrioventricular (AV) block is characterized by block of some, but not all, atrial beats. This excludes block due to premature atrial beats. Typically, it is divided into Mobitz type I block or Wenckebach block, Mobitz type II 2:1 block, and high-grade AV block. The diagnosis of type I and II second-degree AV block is based on electrocardiographic patterns, not on the anatomic site of the block. Precise localization of the site of the block within the specialized conduction system is critical to the appropriate treatment of individuals with second-degree AV block.
:arrow: Atropine (Atropair, Atropine-Care, Isopto) -- Enhances sinus node automaticity. In addition, blocks effects of acetylcholine at AV node, thereby decreasing refractory time and speeding conduction through AV node. Insufficient doses may cause paradoxical effects, further slowing heart rate.
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