iPoop said...
I wonder if he has any source for that tidbit. .
there is literature to support 20% +/- - the literature is small. Since there are many common genes, someone could conceivably acquire Chrons after UC is cured - but most often I assume misdiagnosis.
In a pediatric study of 70 patients who had colon removed: CONCLUSIONS:
In the children studied,
13% had a diagnostic change to Crohn's disease, and 13% were diagnosed with Crohn's after ileal pouch-anal anastomosis (IPAA).
Another study compared 21 people with a change in daignosis to 50 UC and 50 CD that did not have a change. Those who had the change usually had non-bloody D at the start, weight loss, and more extensive coverage.
Background & Aims: Some patients diagnosed with UC undergo a change in diagnosis to CD. Identification of predictors of a diagnostic change could potentially impact the management of patients with colonic inflammation. Our aim was to characterize clinical and serologic predictors of a change in diagnosis from UC to CD. Methods: A nested, case-controlled study was performed to compare individuals with a change in diagnosis from UC to CD (cases) with age-matched UC and CD controls; primary analysis compared cases with UC controls. Subjects underwent chart review for clinical “red flags” identified by gastroenterologists with expertise in IBD. Serum collected at the time of database enrollment was tested for antibodies to oligomannan (anti–Saccharomyces cerevisiae), Pseudomonas fluorescens–related protein, Escherichia coli outer membrane porin C, CBir1 flagellin, and perinuclear antineutrophil cytoplasmic antibodies. Results: Twenty-one cases, 52 UC controls, and 56 CD controls were assessed.
Three red flags, but no serologic markers, differed between cases and UC controls. At initial colonoscopy, cases were more likely to have extensive colonic involvement than UC controls (P = .008). Multivariate regression identified non-bloody diarrhea at initial presentation (P = .01) and weight loss >10% at presentation (P = .007) as independent predictors of diagnostic change. Serologic markers did not add to the contribution of these 2 clinical factors in predicting a change in diagnosis from UC to CD.
Diagnostic change was evident in 6 of 6 (100%) patients with both predictors, compared with 8 of 50 (16%) with neither of these factors (P < .0001). Conclusions: Patients with a diagnosis of UC with initial non-bloody diarrhea or weight loss have an increased likelihood of subsequent change in diagnosis to CD and might thus warrant further diagnostic work-up.