Bradycardia and Hypotension from Wrestling Choke Hold! - USMLE Forums
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Old 08-01-2011
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Question Bradycardia and Hypotension from Wrestling Choke Hold!

During a wrestling match, one contestant keeps his competitor in a "choke-hold" position for over two minutes. Subsequently, the competitor loses consciousness and falls to the floor. A recording of this competitor’s vital signs will have shown bradycardia and hypotension as a result of:
A. Increased carotid body activity
B. Increased vagus afferent firing to medulla
C. Increased glossopharyngeal afferent firing to medulla
D. Decreased glossopharyngeal afferent firing to medulla
E. Decreased vagus afferent firing to medulla
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Old 08-01-2011
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The answer is C
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Old 08-01-2011
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I'm thinking C
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Old 08-01-2011
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Interesting, i may think on D... still not sure. Because here is a concept of increasing Efferent and decreasing Afferent...
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Old 08-01-2011
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c) increased GPh firing (carotid reflex)
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Old 08-01-2011
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C. Increased glossopharyngeal afferent firing to medulla
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Old 08-02-2011
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i will go with c
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Old 08-02-2011
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i'm confused with b or c. guess i'll go with c!
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Old 08-02-2011
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Correct Answer answer

The correct answer is C.
The carotid sinus, located at the bifurcation of the common carotid, has baroreceptors which modulate HR and BP. The "choke hold" position will exert carotid massage on the competitor with resultant bradycardia and hypotension. Remember that increased carotid sinus pressure increases baroreceptor firing through the glossopharyngeal afferents to the medulla. By contrast, vagus nerve transmits afferent impulses from the aortic arch baroreceptors.
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Cardiovascular-, Nervous-System-, Neuroanatomy-, Physiology-, Step-1-Questions

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