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 onychomycosis. Your untrustworthy surgeon recommends general anesthesia for a really intense cleaning of the toenails.
When you awaken, he proudly announces, "Congratulations! I have successfully severed your medial cord of your brachial plexus!"
You are mystified.
On nerve conduction study, when will compound motor action potential amplitudes become abnormally low?
A) 10 to 14 days B) 7 to 10 days C) 4 to 6 weeks D) Immediately E) 3 to 4 weeks
This question was created on January 16, 2007 by .
This question was last modified on January 25, 2007.
ANSWERS AND EXPLANATIONS
A) 10 to 14 days
This answer is incorrect.
Wallerian degeneration of the axons occurs in about 7 to 10 days. Sensory fibers degenerate slightly later than motor fibers. As a result of the Wallerian degeneration, compound motor action potential (CMAP) amplitudes drop, or may become absent altogether. (
See References)
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B) 7 to 10 days
This answer is correct.
Wallerian degeneration of the axons occurs in about 7 to 10 days. Sensory fibers degenerate slightly later than motor fibers. As a result of the Wallerian degeneration, compound motor action potential (CMAP) amplitudes drop, or may become absent altogether. (
See References)
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C) 4 to 6 weeks
This answer is incorrect.
Wallerian degeneration of the axons occurs in about 7 to 10 days. Sensory fibers degenerate slightly later than motor fibers. As a result of the Wallerian degeneration, compound motor action potential (CMAP) amplitudes drop, or may become absent altogether. (
See References)
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| | |
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D) immediately
This answer is incorrect.
Wallerian degeneration of the axons occurs in about 7 to 10 days. Sensory fibers degenerate slightly later than motor fibers. As a result of the Wallerian degeneration, compound motor action potential (CMAP) amplitudes drop, or may become absent altogether. (
See References)
|
| | |
| | |
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E) 3 to 4 weeks
This answer is incorrect.
Wallerian degeneration of the axons occurs in about 7 to 10 days. Sensory fibers degenerate slightly later than motor fibers. As a result of the Wallerian degeneration, compound motor action potential (CMAP) amplitudes drop, or may become absent altogether. (
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
Estimated Permutations: 0