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Anemia at the time of diagnosis of inflammatory bowel disease: Prevalence and associated factors in adolescent and adult patients
Affiliation:1. Department of Gastroenterology, Hospital General de Tomelloso, Tomelloso, Ciudad Real, Spain;2. Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Spain;3. Research Support Unit, Hospital General La Mancha Centro, Alcázar de San Juan, Spain;4. Department of Gastroenterology, Hospital General La Mancha Centro, Alcázar de San Juan, Spain;5. Department of Gastroenterology, Hospital Virgen de Altagracia, Manzanares, Spain;6. Department of Gastroenterology/IBD Unit, Hospital General Universitario de Ciudad Real, Spain;7. Department of Gastroenterology, Hospital Gutierrez Ortega, Valdepeñas, Spain;8. Department of Gastroenterology, Hospital Santa Bárbara, Puertollano, Spain
Abstract:BackgroundThe prevalence, characteristic and determinants of anemia, at the time of inflammatory bowel disease (IBD) diagnosis have yet to be fully elucidated.MethodsRetrospective cross-sectional study. Analytical data and disease characteristics obtained upon diagnosis of 1278 IBD patients [Crohn’s disease/ulcerative colitis (CD/UC): 718/560] were collected.ResultsAnemia was present in 41.2% of patients at diagnosis (47% and 33.8% of CD and UC patients, respectively; p < 0.001), being severe in 5.5%. Iron deficiency anemia represented 69.6% of cases, with no differences between CD and UC. Female sex was the strongest risk factor for anemia in both CD and UC (OR 7.11; 95%CI 4.18–12.10 and 6.55; 95%CI 3.39–12.63, respectively), followed by elevated (≥2 mg/dL) C-reactive protein (OR 4.08; 95%CI 2.39–6.97 and 4.58; 95%CI 2.26–9.27, respectively). Current smoking was a risk factor for anemia in CD (OR 2.23; 95%CI 1.24–4.02), but a protective one in UC (OR 0.36; 95%CI 0.14–0.92). A penetrating CD behavior increased the risk of anemia (OR 3.34; 95%CI 1.36–8.21); in UC, anemia increased with disease extension (E2 + E3) (OR 1.80; 95%CI 1.13–2.86).ConclusionsFemale sex and disease activity are major determinants of anemia at IBD diagnosis. Anemia is associated with disease behavior in CD and with disease extension in UC.
Keywords:Anemia  Crohn’s disease  Inflammatory bowel disease  Ulcerative colitis
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