@grumpa
I don't think my rheumatologist would have ever started me on Actemra with a history of Crohns. I was led to believe that Actemra and Kevlara are prohibitive for anyone with inflammatory bowel disease (IBD).
Ever since I was diagnosed with reactive arthritis in the early 1990's, I have always been afraid of developing IBD. It was an enteric infection that ushered in a slew of problems for me.
I had my first colonoscopy that was ordered by a rheumatologist who wanted to see if I also had Crohns back in 2008. When PMR was subsequently diagnosed, I was started on long term Prednisone. I felt vindicated because I was treating myself with many short term bursts of high dose Prednisone for 15 years before PMR was diagnosed.
Crohn's and Reactive Arthritis are in the same spectrum of disorders. I remember when I was first diagnosed with reactive arthritis with uveitis in the early 1990's. The primary care doctor that diagnosed me with Reactive Arthritis mentioned HLA-B27 but didn't want to do the test to see if I was positive or not. The only reason for not doing the test was that it wouldn't change my diagnosis or anything about how I would be treated in the future.
I was tested for HLA-B27 because I was curious and said it would be nice to know. I was positive for HLA-B27 and now my medical record is full of references to HLA-B27 associated things.
https://www.ncbi.nlm.nih.gov/books/NBK551523/
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HLA-B27 is a gene that plays a role in the immune system. It is associated with an increased risk of developing certain autoimmune diseases, including Crohn's disease.
I used to be active on forums for spondyloarthritis. There were people with Crohn's on those forums. Everyone it seemed was being treated with various biologic treatments. I left the spodyloarthritis forums because nobody was being treated with long term Prednisone like I was. In fairness, they all had their various specialty doctors and I was treating myself with Prednisone until PMR was diagnosed many years later. That was when I got the attention of several specialists but never a gastroenterologist.
I just remembered ... it was another enteric infection that triggered the multiple, bilateral, and extensive pulmonary embolism (PE) that I had. The intensive care doctors were inclined to suggest that Prednisone contributed to the event but called the PE unprovoked.
My primary care doctor apologized for possibly missing something. I told him about the enteric infection before the PE. He said people have enteric infections all the time and don't have a PE like I had.
I told my primary care doctor there was no need to apologize. I was the one who refused the pulmonary function test that he recommended when I was complaining about being short of breath with exercise intolerance about 6 months before the PE happened. My primary care doctor said the report he got from the intensive care unit said I had an "acute PE" so I wasn't having chronic PE's.
Now that I'm off Prednisone my medical history seems boring now compared to when I was taking Prednisone. The sequence of events leading to the PE suggests a complex interplay between an underlying inflammatory process being managed with Prednisone combined with an infection.