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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 cruel surgeon recommends general anesthesia for a breast augmentation.
When you awaken, he proudly announces, "Congratulations! I have successfully severed your radial nerve at its origin off the brachial plexus!"
You are somewhat dumbfounded.

On needle EMG, when will you be able to find fibrillations in the triceps?

 
        A) Immediately
 
        B) 3 to 4 weeks
 
        C) 10 to 14 days
 
        D) 4 to 6 weeks
 
        E) 2 to 3 weeks
 

 


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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) immediately

This answer is incorrect.


In a lesion of a very proximal nerve, fibrillations of proximal muscles can typically be detected on needle EMG 2 to 3 weeks after the initial injury.  (See References)

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B) 3 to 4 weeks

This answer is incorrect.


In a lesion of a very proximal nerve, fibrillations of proximal muscles can typically be detected on needle EMG 2 to 3 weeks after the initial injury.  (See References)

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C) 10 to 14 days

This answer is incorrect.


In a lesion of a very proximal nerve, fibrillations of proximal muscles can typically be detected on needle EMG 2 to 3 weeks after the initial injury.  (See References)

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D) 4 to 6 weeks

This answer is incorrect.


In a lesion of a very proximal nerve, fibrillations of proximal muscles can typically be detected on needle EMG 2 to 3 weeks after the initial injury.  (See References)

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E) 2 to 3 weeks

This answer is correct.


In a lesion of a very proximal nerve, fibrillations of proximal muscles can typically be detected on needle EMG 2 to 3 weeks after the initial injury.  (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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