Time Course of EMG/NCS Findings

Topic: Pharmacology

Created on Tuesday, January 16 2007 by

Last modified on Thursday, January 25 2007.

 
        A) 3 to 4 weeks
 
        B) 10 to 14 days
 
        C) 4 to 6 weeks
 
        D) Never
 
        E) 7 to 10 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

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A) 3 to 4 weeks

This answer is incorrect.

In lesions distal to the dorsal root ganglion, 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, sensory nerve action potentials (SNAP) drop in amplitude, or may become absent altogether.  (See References)

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B) 10 to 14 days

This answer is incorrect.

In lesions distal to the dorsal root ganglion, 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, sensory nerve action potentials (SNAP) drop in amplitude, or may become absent altogether.  (See References)

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C) 4 to 6 weeks

This answer is incorrect.

In lesions distal to the dorsal root ganglion, 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, sensory nerve action potentials (SNAP) drop in amplitude, or may become absent altogether.  (See References)

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D) never

This answer is incorrect.

In lesions distal to the dorsal root ganglion, 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, sensory nerve action potentials (SNAP) drop in amplitude, or may become absent altogether.  (See References)

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---

E) 7 to 10 days

This answer is correct.

In lesions distal to the dorsal root ganglion, 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, sensory nerve action potentials (SNAP) drop in amplitude, 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