EMG Findings 01

Topic: Physiology

Created on Saturday, June 6 2009 by jdmiles

Last modified on Saturday, June 6 2009.

 
        A) An acute C7 radiculopathy
 
        B) A chronic ulnar mononeuropathy
 
        C) A chronic T1 radiculopathy
 
        D) An acute ulnar mononeuropathy
 
        E) An acute radial mononeuropathy
 

 

	= Go back to the top of the page.
	= Reload a different version of this question ().
	= Load a random question from the database.
	= Use this question as a template to create a totally NEW question.
	= Enter detailed rating for this question!
	= How users like you have rated this question.

This question was created on June 06, 2009 by jdmiles.
This question was last modified on June 06, 2009.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS

---

A) An acute C7 radiculopathy

This answer is incorrect.

The EMG needle study above is examining the abductor pollicis brevis (APB) muscle. This muscle is innervated by the C8 and T1 nerve roots, the lower trunk, the medial cord, and the median nerve. Large, long, and polyphasic motor unit action potentials seen on EMG would provide evidence for a chronic neuropathic process involving one of these structures. Note that, with only this one needle study, it is impossible to determine which of these structures is affected. Also, with only this one needle study, a more diffuse process (such as a peripheral polyneuropathy) cannot be excluded.  (See References)

Please log in if you want to rate questions.

 

 

 

 

 

 

 

 

 

---

B) A chronic ulnar mononeuropathy

This answer is incorrect.

The EMG needle study above is examining the abductor pollicis brevis (APB) muscle. This muscle is innervated by the C8 and T1 nerve roots, the lower trunk, the medial cord, and the median nerve. Large, long, and polyphasic motor unit action potentials seen on EMG would provide evidence for a chronic neuropathic process involving one of these structures. Note that, with only this one needle study, it is impossible to determine which of these structures is affected. Also, with only this one needle study, a more diffuse process (such as a peripheral polyneuropathy) cannot be excluded.  (See References)

Please log in if you want to rate questions.

 

 

 

 

 

 

 

 

 

---

C) A chronic T1 radiculopathy

This answer is correct.

The EMG needle study above is examining the abductor pollicis brevis (APB) muscle. This muscle is innervated by the C8 and T1 nerve roots, the lower trunk, the medial cord, and the median nerve. Large, long, and polyphasic motor unit action potentials seen on EMG would provide evidence for a chronic neuropathic process involving one of these structures. Note that, with only this one needle study, it is impossible to determine which of these structures is affected. Also, with only this one needle study, a more diffuse process (such as a peripheral polyneuropathy) cannot be excluded.  (See References)

Please log in if you want to rate questions.

 

 

 

 

 

 

 

 

 

---

D) An acute ulnar mononeuropathy

This answer is incorrect.

The EMG needle study above is examining the abductor pollicis brevis (APB) muscle. This muscle is innervated by the C8 and T1 nerve roots, the lower trunk, the medial cord, and the median nerve. Large, long, and polyphasic motor unit action potentials seen on EMG would provide evidence for a chronic neuropathic process involving one of these structures. Note that, with only this one needle study, it is impossible to determine which of these structures is affected. Also, with only this one needle study, a more diffuse process (such as a peripheral polyneuropathy) cannot be excluded.  (See References)

Please log in if you want to rate questions.

 

 

 

 

 

 

 

 

 

---

E) An acute radial mononeuropathy

This answer is incorrect.

The EMG needle study above is examining the abductor pollicis brevis (APB) muscle. This muscle is innervated by the C8 and T1 nerve roots, the lower trunk, the medial cord, and the median nerve. Large, long, and polyphasic motor unit action potentials seen on EMG would provide evidence for a chronic neuropathic process involving one of these structures. Note that, with only this one needle study, it is impossible to determine which of these structures is affected. Also, with only this one needle study, a more diffuse process (such as a peripheral polyneuropathy) cannot be excluded.  (See References)

Please log in if you want to rate questions.

 

 

 

 

References:

1. Preston, D.C., and Shapiro, B.E. (2005). Electromyography and Neuromuscular Disorders: Clinical-Electrophysiologic Correlations, 2nd Edition. Elsevier, Philadelphia. (ISBN:075067492X)

Advertising:

Please log in if you want to rate questions.

 

FrontalCortex.com -- Neurology Review Questions -- Neurology Boards -- Board Review -- Residency Inservice Training Exam -- RITE Exam Review
physiology
EMG Findings 01
Question ID: 060609115
Question written by J. Douglas Miles, (C) 2006-2009, all rights reserved.
Created: 06/06/2009
Modified: 06/06/2009
Estimated Permutations: 126000