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Retired NBME 20 Answers

nbme20/Block 3/Question#50 (reveal difficulty score)
A 62-year-old man comes to the physician ...
Agonist at ฮณ-aminobutyric acid B (GABAB) receptors ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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 +14  upvote downvote
submitted by โˆ—neonem(629)
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This patient likely has some form of upper motor neuron lesion or disease - UMN lesions are characterized by weakness, increased deep tendon reflexes, and spastic paresis. Baclofen is a GABA-B agonist specific to the spinal cord, used ot treat muscle spasticity, dystonia, and MS. GABA-B is a G-protein coupled receptor coupled to Gi, so agonism of this receptor causes hyperpolarization of the neurons and decreased release of excitatory glutamate.

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kevin  stimulates K+ efflux (hyperpolarization) and inhibits Ca2+ influx (no vesicle release) +3
lovebug  FA 2019, 538page !! +2



 +5  upvote downvote
submitted by โˆ—strugglebus(189)
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They are talking about Baclofen, a GABA-B agonist known to treat muscle spasticity

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