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And since you asked . . .
. . .technically speaking, small fiber neuropathy--the dysfunction of thinly myelinated and unmyelinated sensory nerves that subsume the sensations of pain and temperature, and many autonomic functions--cannot result in muscle weakness, as those types of fibers don't ennervate muscles.
That said, though, many report increased fatigue from the condition, not only from autonomic disruption but just from the day to day grind of dealing with symptoms, which is often interpreted as increased weakness. And, of course, there is nothing that says one has to have an isolated small-fiber involvement--while some do have their neuropathy limited to that type of fiber, many have damage to both small and larger fibers; the latter control the sensory impressions of balance in space, vibration and mechanical touch, as well as voluntary muscle control. Generally, those who have noticeable weakness in muscles from a neuropathic process can have that picked up by a well-done EMG (unless the weakness is very recent--that type of damage often takes some weeks or months to make itself manifest on testing). I'm not sure about hives being caused by small fiber neuropathy, or even large fiber, but there are a lot of conditions associated with small-fiber neuropathies that may produce skin abnormalities that look like hives, from the rash of dermatitis hepatiformis in those with celiac/gluten sensitivity (which can cause neuropathy) to the rash disruption in a number of vascular and connective tissue autoimmune conditions (from lupus to Bechet's to Churg Strauss to polyarteritis nodosa). |
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Not too long ago I had an itchy rash on my arm. The Johns Hopkins doctors were very interested in it, but did not really explain why. In any matter, I took a combination of Clobetasol (topical steriod cream for contact dermatitis and Hydroxyzine (oral corticosteroids for contact dermatitis). It resolved itself. I do agree with the earlier comment that it has something to do with a lowered immune response but not a direct relation to the SFN cause. Steriods are scary. The hydroxyzine is very low impact compared to most oral steriods...not sure if it works on hives though. I had 6 rounds of IVig as well and decided it was not making a significant impact so we discontinued it this past March. The Benadryl did a number on me as well-made me exhausted. It is normal protocol to avoid allergic reactions as each dose you get is a "new" blood product. Let me know what you decide about the lip biopsy. Would your treatment change with the results? That is what I ask myself every time a new test comes up and I need to decide... |
Congrats on your daughter's graduation by the way!
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It's been about a year since my last EMG. It found no large fiber involvement. I definitely have muscle weakness. My legs feel like lead coming up stairs. I'm actually trying some PT now hoping to build up some muscle strength. I have an upcoming appt. with my neuro. As I said he spoke of possibly a muscle biopsy. I'm not sure I want to go through that . Thanks again! |
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After getting all this information, I believe I'm going to request my rheumo give me a much lower dose of steroids with my IVIG. I'm also going to request trying Zyrtec instead of Benadryl. I really need to pay better attention to how much the IVIG is helping. I just said to enbloc I try hard not to focus on my pain level etc but I guess I should. I will let you know about my decision with the lip biopsy. It is a great question will it change my treatment. I'm definitely asking that. I forgot you had a Sjogrens diagnosis also. If I knew how I would post the possible diagnosis I have gotten but with all the guess each doctor has made it would take up a whole page. Each doctor seems to have a different possibility.:) |
Amen to that!!!!:(
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