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What Is The Normal Measurement For Nerve Conduction Studies?
Question: With respect to Nerve Conduction Studies – Anti-Sensory
What is % of change (e.g., 10%,20%, …)from normal measurement before negative symptoms and what are possible medical conditions.
Median, Sural Anti-Sensory, Ulnar
1. % Peak (ms) < Normal Peak (e.g., peak > 33% normal)
2. P-T Amplitude < or > Normal P-T (e.g., P-T amp <50% normal)
3. Vel (m/s) < or > Normal Vel (e.g.,Vel 20% < Normal)
With respect to Motor Studies
What is % of change from normal measurement before negative symptoms and what are possible medical conditions. Example: Motor onset for wrist > 30% normal is possible problem increasing with % increase
Median – wrist, elbow: Peroneal – Ankle, B Fib, Poplt: Tibial Motor – Knee: Ulnar Motor - Wrist
1. % Onset (ms) < Normal Onset (ms) (e.g, Onset <20% normal)
2. O-P Amp < or > Normal O-PT (e.g., O-P Amp> 50% Normal)
3. Vel (m/s) < or > Normal Vel (m/s) (e.g., Vel <85% Normal)
With respect to F wave Studies
Left Peroneal >m10% Lat Norm Onset
Brief Answer:
My reply is below.
Detailed Answer:
Hi,
Thank you for posting your query. I have noted the nerve conduction study related queries. Following are the explanations:
1. Motor nerves- we look at the amplitude, distal latency and conduction velocity. If amplitude is low, it indicates damage to the axon of the nerve. If the distal latency is prolonged, and conduction velocity slow, it indicates damage to the myelin (nerve covering)-demyelinating neuropathy.
2. Sensory nerves- Again we look at the amplitude, distal latency, and conduction velocity. Interpretation of abnormal results is just like motor nerves.
3. F waves- Prolonged F wave latency refers to radiculopathy or nerve root involvement.
Common causes for axonal nerve damage are diabetes, vasculitis, leprosy, drug or toxin related, etc.
Common causes for demyelinating neuropathy include diabetes, CIDP, GBS, etc.
I hope my answer helps. Please get back if you require any additional information.
Wishing you good health,
Dr Sudhir Kumar MD (Internal Medicine), DM (Neurology) XXXXXXX Consultant Neurologist
Apollo Hospitals, Hyderabad, India
Click on this link to ask me a DIRECT QUERY: http://bit.ly/Dr-Sudhir-kumar
My BLOG: http://bestneurodoctor.blogspot.in
Above answer was peer-reviewed by :
Dr. Chakravarthy Mazumdar
The answer does not provide numbers or the ability to understand the signifcance of differences. Your answer is not very helpful.
Brief Answer:
Thank you for getting back.
Detailed Answer:
I am sorry it did not help you.
Are you asking about one particular nerve conduction report or a more general question. If you have a specific report belonging to you or a patient, I request you to upload it by scanning. On the other hand, if you have general questions about the nerve conduction studies, I request to ask them in point form.
I hope I would be able to answer them satisfactorily.
Best wishes,
Dr Sudhir Kumar MD DM (Neurology)
Above answer was peer-reviewed by :
Dr. Chakravarthy Mazumdar
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