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What could cause fibrillations and positive sharp waves on an

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Posted on Wed, 20 Feb 2019
Question: What could cause fibrillations and positive sharp waves on an EMG but no motor unit abnormalities (like polyphasic units, reduced amplitude, etc.)?
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Answered by Dr. Erion Spaho (9 hours later)
Brief Answer:
Probably nerve fibers injury.

Detailed Answer:
Hello and welcome to "Ask a Doctor" service.

I have read your query and here is my advice.

The main cause for fibrillation and positive sharp waves on an EMG is nerve fibers injury.

The causes of the nerve injury may be entrapment syndromes, nerve root compression, axonal injury, etc.

In order to be correct about the diagnosis, these EMG findings should be evaluated in the clinical setting.

Hope you found the answer helpful.

Let me know if I can assist you further.
Above answer was peer-reviewed by : Dr. Kampana
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Answered by
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Dr. Erion Spaho

Neurologist, Surgical

Practicing since :2004

Answered : 4227 Questions

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What could cause fibrillations and positive sharp waves on an

Brief Answer: Probably nerve fibers injury. Detailed Answer: Hello and welcome to "Ask a Doctor" service. I have read your query and here is my advice. The main cause for fibrillation and positive sharp waves on an EMG is nerve fibers injury. The causes of the nerve injury may be entrapment syndromes, nerve root compression, axonal injury, etc. In order to be correct about the diagnosis, these EMG findings should be evaluated in the clinical setting. Hope you found the answer helpful. Let me know if I can assist you further.