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What effects does atropine have on the cardiovascular system?

While preparing a lecture on cholinergic antagonists, I want to move beyond the textbook fact that it increases HR. I need a more integrated understanding of its effects on cardiac output, blood pressure, and coronary circulation to explain its full therapeutic profile and potential adverse effects to my students.

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By Gayatri Answered 5 months ago

From my experience in the ICU, atropine's primary and most reliable effect is chronotropy increasing heart rate. This can subsequently improve cardiac output in a rate-dependent heart. Importantly, I have seen that it has little to no direct inotropic or vasoactive effect. Its impact on blood pressure is therefore variable and indirect. I would recommend remembering that atropine can cause a initial, transient bradycardia, and at high doses, it may induce peripheral vasodilation via a complex mechanism, which is why monitoring the full hemodynamic picture is crucial.

 

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