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Time Course of EMG/NCS Findings

Topic: Pharmacology

Created on Tuesday, January 16 2007 by

Last modified on Thursday, January 25 2007.

Sadly, you suffer from body dysmorphic disorder. Your brilliant but misunderstood surgeon recommends general anesthesia for a breast augmentation.
When you awaken, he proudly announces, "Congratulations! I have successfully severed your ulnar nerve at its origin off the brachial plexus!"
You are a bit bothered.

On needle EMG, when might you expect to see long, large, polyphasic motor unit action potentials in the affected muscles?

A) 2 to 3 weeks

B) Several months

C) 3 to 4 weeks

D) 4 to 6 weeks

E) 10 to 14 days

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This question was created on January 16, 2007 by .
This question was last modified on January 25, 2007.

ANSWERS AND EXPLANATIONS

A) 2 to 3 weeks

This answer is incorrect.

After an injury which causes destruction of a peripheral nerve or root, reinnervation typically takes months to occur. Long, large, polyphasic units are a sign of reinnervation. (See References)


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B) several months

This answer is correct.

After an injury which causes destruction of a peripheral nerve or root, reinnervation typically takes months to occur. Long, large, polyphasic units are a sign of reinnervation. (See References)


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C) 3 to 4 weeks

This answer is incorrect.

After an injury which causes destruction of a peripheral nerve or root, reinnervation typically takes months to occur. Long, large, polyphasic units are a sign of reinnervation. (See References)


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D) 4 to 6 weeks

This answer is incorrect.

After an injury which causes destruction of a peripheral nerve or root, reinnervation typically takes months to occur. Long, large, polyphasic units are a sign of reinnervation. (See References)


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E) 10 to 14 days

This answer is incorrect.

After an injury which causes destruction of a peripheral nerve or root, reinnervation typically takes months to occur. Long, large, polyphasic units are a sign of reinnervation. (See References)


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References:

1. Preston, D.C., and Shapiro, B.E. (2005). Electromyography and Neuromuscular Disorders: Clinical-Electrophysiologic Correlations, 2nd Edition. Elsevier, Philadelphia.
2. Guarantors of Brain. (2000). Aids to the Examination of the Peripheral Nervous System, fourth edition. W.B. Saunders, Edinburgh.
3. Moore, K.L. (1992). Clinical Oriented Anatomy, 3rd Edition. Williams & Wilkins, Baltimore.


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pharmacology
Time Course of EMG/NCS Findings
Question ID: 01160700
Question written by . (C) FrontalCortex.com 2006-2009, all rights reserved. Created: 01/16/2007
Modified: 01/25/2007
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