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Kitt Charcot-Marie-Tooth (CMT) |
You can have all the HNPP symptoms with CMT. My neurologist at Johns Hopkins was convinced that I would test positive for HNPP as my EMG showed pinched nerves at wrists and elbows. The test, which is only 85% accurate, was negative. I also have all the symptoms of an axonal hereditary neuropathy, which was the final diagnosis. In addition to my limbs falling asleep several times each day and night, I have loss of sensation to above the knee and visible muscle wasting and weakness. My arms and legs are affected and I have constant pain, both neuropathic and joint and muscle related, spasms, etc.
CMT can cause internal issues not usually asociated with neuropathy, which could explain the intestinal connection. Your tests should provide a lot more info. I hope that you have more answers soon and that yours is one of the treatable cases. Hereditary ones are not. If it is any consolation, quick onset often means it can improve. |
HNPP and CMT
There are many types of CMT. 50 and counting as of a few years ago. DNA blood testing can tell you what type you may have if it is one of the types they can test for. Otherwise, the following is some information from the HNPP site which might be of help. There also is DNA blood testing for HNPP.
Here are some of the symptoms of HNPP. http://www.hnpp.org/hnpp_symptoms.htm More information showing the difference between CMT1A and HNPP. http://www.hnpp.org/genetics.htm Some more information. http://www.hnpp.org/diagnosing.htm On this site it is interesting how at first nerves do heal but then it just keeps going and with each episode they finally do not heal. http://www.hnpp.org/progression.htm Five major ways HNPP can look. http://www.hnpp.org/varieties.htm The whole site is very interesting. www.hnpp.org The woman who wrote this was at one of my support group meetings for CMT. She has HNPP and explained it very well. And as far as CMT, family history helps a lot. Kitt Charcot-Marie-Tooth (CMT) |
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My older daughter (29) does not appear to have it, and neither does my younger (26) year old son, but they are very sensitive about discussing it and do not want to consider the possibility that they may be affected. It is a very touchy issue for them. My daughter has a baby and wants a large family and does not want to think about passing anything like this on to them. My family history was incomplete, but I do have a half sister with a severe case, childhood onset. My son's case was confirmed in China, where he lives, through examination and family history, not blood testing, so we do not have the exact variant, only that it is axonal. |
Thanks Kitt for the HNPP links. When you posted the one on the other post of mine, I read through the whole website. It sounds just like me right now, kinda scary even. If I do have HNPP or any hereditary PN I will need to do some research on how testing positive will affect mine and my girls ability to obtain health and life insurance in the future.
I asked my primary for a dna test 2 years ago. He said no "because they are very expensive and not covered under insurance". I went home and looked up the cost. I found one for $350.00 but they would not give the results to you directly, you had to get the results sent to a doctor to read them for you. I have spent way more than $350 on proceedures that didn't help, so I started hunting down a doctor that could read the results. All I found were doctors that dealt with cancer, and refused to see me as I was not part of their speciality. So I let it go, and just dealt with managing my PN... I may be a bit miffed if I get the DNA test now and it comes bqck positive with information that could have saved me agony, anxiety, and strife the last 2 years just to have a diagnosis... (i have also seen where the dna tests have gotten much cheaper right now.) |
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Athena Diagnostics pretty much has a patent on DNA blood testing for the types of CMT at least. And they are very expensive. They are pretty much the only ones who do the testing for the types of CMT. Insurance sometimes covers and other times it does not. You would have to check that out. You are correct to be concerned about how testing might affect being able to get health insurance for your family in the future. You probably could get it but it would cost big bucks to have it. I don't believe they can deny you or put a waiver on it as they did before but again it would probably cost a lot of money. This has been true of other health conditions as well. However, if you work for a large company, then you will get health insurance without any health questions. But if you have to get individual health insurance then it can be a huge problem. This is probably true for life insurance as well. If in fact you do have HNPP or a type of CMT there is no cure/treatment at the present time for any of it. Lots of research is being done but there isn't anything at the present time. I chose not to be tested but family history, EMG/NCV testing (I really had nil for symptoms) and a good neurologist (an expert in CMT) told me. I never saw him as a patient but I told him what my EMG/NCV showed and about my family history at one of my support group meetings. However, I already knew as I can trace it way back in my ancestors. You can just deal with the symptoms as they come along. You can be young, old, or in-between before any symptoms might become evident. You may never have any evident symptoms but still can pass it on. Pretty much the same for HNPP. It is a personal choice after weighing all of the information. Personally, I would not get tested. If symptoms come along I just deal with it. That is what I have done. JMO. It is a personal choice. I was wondering where you found a DNA blood test for $350.00 and was it for HNPP or CMT? Just curious. I wish you well. Kitt Charcot-Marie-Tooth (CMT) |
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Also, it is important to realize that the tests do not cover all the variants, although this improves all the time, nor are they foolproof, carrying a 10-15% rate of inaccuracy. What this means is, if you test positive you have a very specific name for your disease. If you test negative you do not know that you don't have it. They all progress at unpredictable, but usually slow, rates, and none are treatable. I believe that by following the advice on this forum as to taking good care of yourself, exercising as tolerated, and eating healthfully, you can maximize your quality of life, but if it is CMT, you and your doctors have little control. I was released by my neurologists to my PCP for pain management, a not uncommon occurrence on this board. Doctors really do like to heal people and they would rather not deal with things that make them feel helpless. I really hope that your tests reveal a more hopeful diagnosis! |
Testing HNPP/CMT1A
There is another side to this. If you have to test for the whole panel of CMT types/subtypes that they can now test for, it is very expensive. However, if you test for HNPP and CMT1A it is less expensive. That can tell you if you have one or the other. CMT1A is one of the most common types/subtypes and HNPP is the opposite of CMT1A.
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