Posted 8/18/2014 5:08 AM (GMT 0)
In another thread, I was asked what tests determined cause of my severe joint pain. Disclaimer–I’m not a doctor. I just read a lot of medical articles to follow my doctors’ thinking and ask questions. So what I say here may not be 100% correct. It’s what I think I learned.
Severe joint pains can have several causes:
1-Extra-intestinal manifestation of UC (IBD more generally). It’s easy for docs to interpret our pain as just that, and give us medication to make it more tolerable. Some of patients with make a shorter interval (do remicade earlier than planned) to reduce joint pain, only to have it return after a few weeks.
2-Side effect of a medication (like we may get headache, dizziness, nausea to a drug). We whether it’s worth it (ask ourselves: do benefits outweigh yucky side effects).
3-Infusion reactions – immediate (ex. Anaphylaxis, hives) or delayed (ex. fatigue, joint pain, muscle aches, fever, for a few days). Can be mild, moderate, severe. We take Remicade pre-meds to prevent immediate. I don’t know if anything prevents these delayed reactions.
4-Antibodies to Remicade can show up as joint pains, but it’s also possible there are no clinical signs that antibiodies have formed (except for perhaps a flare). Definitive blood test can show it specifically. If positive, drug is ineffective, so it’s a waste to take it. More important, we aren’t getting maintenance drug we need.
5-Adverse reactions to Remicade – can be acute (w/in 24 hrs) or delayed. Mine was delayed, and it felt cumulative. I was diagnosed as Anit-TNF drug induced lupus (ATIL) and polyneuropathy. All symptoms better on prednisone. No pain after 6 wks still neuropathy & weakness but feeling better. Most (but not all) cases resolve, studies show. Will retest labs later, but it can take months or years for labs to return to normal.
How did they diagnose this? Thinking back, clinical features seem most important – severe pain (excruciating, debilitating pain). Very bad 5 months into Remicade - in legs, knees, feet, with pain, stiffness, mild swelling, poor balance, weakness. By 6 months couldn’t move hands/fingers, arms, then up shoulders and neck. Worst were hands/wrists. Was it joint pain, muscle pain, nerve pain? Hard to sort out when pain is so severe. Also, pain was constant in some areas, but some pain moved around. (I consulted Lupus and Fibro sites here to see about symptoms. Indeed, some were similar.) I read studies and meta-analyses. Here’s what I found out – again with disclaimer of “I’m not a doctor” so it may not be 100% correct. I hope to save you hours and hours I spent searching, so you can have more informed conversations with your doctors.
TNF-alpha inhibitors are known to bring on new onset or exacerbate underlying disorders (ex lupus, neurological disorders associated with demyelination, heart failure, myalgias, lymphoma, can awaken Hep B, etc.). We know this before starting (They disclose it). We take our chances based on the odds.
Lab work: I don’t know doctors’ protocol, and some are more data-driven than others. I think they first rule out infection, since Remicade weakens immune systems. They do CBC w/diff, metabolic panel, lots of specific tests: ESR, Sed rate (By the way, sometimes w/UC, neither ESR or Sed Rate may be elevated, especially if it’s very inflamed distally). Also Creatinine, C-reactive Protein, ANA (one indicator of lupus-like reactions),etc. They may test to see if we have formed other neutralizing antibodies – dsDNA, IgG, SS-A/Ro, Sm, RNP, scl, Jo1, p-ANCA, MPO, PR3, etc. Various labs if positive could suggest types of connective tissue diseases that may be at work with myalgias, vasculitis, etc. They want to be sure our organs aren’t damaged, esp kidneys…. Lot of folks have skin manifestations (I didn’t). Labs aren’t definitive. There are always ranges (like 30 to 100% of people with X are positive on Y test). So serologies give them a sense of what may be going on and what to rule out. At one point, I couldn’t turn my head due to neck pain. Ruled out meningitis. MRI of neck was done to check for demyelination. Negative, fortunately. An EMG and nerve conduction study was to investigate possible myopathy vs polyneuropathy. Affirmative for the latter. (They don’t know how to cure it, only how to medicate to make it less painful…. Tried some medications but couldn’t tolerate side effects ….)
It’s clinical symptoms alongside labs that lead them to diagnose if we have another autoimmune disease in addition to UC. (By the way, some tests can be positive anyway in IBD.) With severe pain, I had several high positive tests common for people having lupus-like symptoms. The fact that they came on a few months into remicade (within first 6 months) is typical if it is going to happen, but it can be later.
So I had those “paradoxical adverse events associated with Anti-TNF Agents”. If you Google that or Anti TNF Induced lupus (ATIL), you’ll see articles dating back from 2003 thru 2014. t’s still only a VERY SMALL percentage of people who have these reactions, let alone severe ones, like mine (and same for Thoreau, Happyday, Soystud, Canada Mark, if that's what you guys have...). Remicade (infliximab) seems to have one of the higher %s and a broader range of clinical symptoms than the others in this class of drugs. I still have no regrets about taking it, and hoping prednisone & time will resolve it.
And I'm still searching for my next UC maintenance drug, possibly Entyvio, but I see that it caused joint pains in the clinical trials... I hope this long post is helpful!