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NBME 15 Answers

nbme15/Block 1/Question#15 (9.6 difficulty score)
A 48-year-old woman comes to the emergency ...
Increased cardiac parasympathetic activity🔍,📺

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submitted by cassdawg(1381),

Carotid sinus massage is a mechanism of inducing activation of the parasympathetic system. This is because the baroreceptors in the carotid sinus.

Caortid sinus massage --> activation and increased firing of baroreceptors --> transmission to solitary nucleus via glossopharyngeal nerve --> decreased sympathetic output and increased parasymapthetic output v --> increased AV node refractory period and decreased HR

FA2020 p296

cheesetouch  FA18 p 291 +  
hecticsurreyguy  Want to reduce the heart rate while maintaining cardiac output - digitalize the patient (give them digoxin). Digoxin: 1. increase vagal stimulation of the AV node, thereby reducing heart rate. = "Increased cardiac parasympathetic activity" 2. increase the contractility of the heat. This way alothough you're reducing the heart rate, you're maintaining cardiac output. +