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Review Question - QID 8895

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QID 8895 (Type "8895" in App Search)
A 38-year-old female develops pain and pallor in all the digits of the right hand daily. Her symptoms have progressed over 2 years despite avoiding direct cold exposure and multiple medications including nifedipine. Recently she has developed the lesions seen Figure A. Workup for underlying disease by her rheumatologist was negative. She is a candidate for Botuninum toxin A injections. What is the physiologic effect of botulinum toxin in the hand for her condition?
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