Polymyositis & Dermatomyositis Support Group
Polymyositis (PM) is a type of chronic inflammation of the muscles (inflammatory myopathy) related to dermatomyositis and inclusion body myositis. The inflammation is predominantly of the endomysium in polymyositis, whereas dermatomyositis is characterized by primarily perimysial inflammation.
So sorry for your frustration, romeomustdie. These autoimmune diseases are confusing, frustrating, and aggravating. It's my understanding that most of the meds prescribed for autoimmune disease can skew test results because they suppress the immune system. When I first got sick in 2006, one of the first doctors I saw suspected Lupus and RA, but my blood work was always negative. (He called it sero-negative.) The Lupus wasn't diagnosed until 2010-2011 after a couple skin biopsies were done. I, too, have myositis, but I have PM and was told overlapping DM. The PM was diagnosed in 2008. Did you know that lupus can induce myositis?
http://www.lupus.org/answers/entry/...
http://www.webmd.com/a-to-z-guides/...
I'm no doctor, but because lupus can "travel" around in the body, your test results may have also changed because the lupus is someplace else right now. Just my uneducated theory. That's what the lupus does to me. Today it can be affecting my eyes, ears, and brains; but next week the lupus might affect my kidney and bladder. Autoimmune diseases can be elusive to doctors, so I try to be proactive myself by eating healthily and doing online research. Even though I can't totally regain my former robust health, at least I'm maintaining a measure of health. I hope you find what works for you. Best wishes, and don't give up.
Here is a link to the presentation from the conference. I found this very interesting. http://www.myositis.org/storage/documents/2014_conference/Presentations/What_your_autoantibodies_tell_us_about_your_disease.pdf
I know for me, I wanted to be tested for Jo1. My doctor had to research how to write an order for it. Then I took it to the lab and I am not even positive they pulled it right. When the results came back, my doctor wasn't sure how to read it. I love my doctor and think she really tries but she is not a Myositis expert. She is probably not alone in struggling to figure it out. I was appreciative she shared her lack of knowledge instead of pretending she had all the answers. We are learning together.
Great doctors are only good for us if they are literate with Myositis and that is a rare quality in my experience.
I am so sorry that you are left now without any answers. I would continue your search, ask your Primary to help you find a Myositis doctor, Ask the TMA at Myositis.org for a suggestion. Free to join and great information there.
Are you symptomatic?? Symptoms always trump lab results, have you had a muscle biopsy?? Some have to get that done to prove they have Myositis. I wish i had other answers for you...
I wish you well as you move forward. Keep us posted.