The Relevance of Vitamin and Iron Deficiency in Patients with Inflammatory Bowel Diseases in Patients of the Swiss IBD Cohort.

Inflamm Bowel Dis. 2018 Jul 12;24(8):1768-1779. doi: 10.1093/ibd/izy054 Madanchi M1, Fagagnini S1,2, Fournier N3, Biedermann L1, Zeitz J1, Battegay E2, Zimmerli L4, Vavricka SR1,5, Rogler G1,6, Scharl M1,6; Swiss IBDCohort Study Group. Collaborators (163)

Author information

1 Department of Gastroenterology and Hepatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland.

2 Division of Internal Medicine, University Hospital Zurich, Zurich, Switzerland.

3 Institute of Social and Preventive Medicine (IUMSP), Lausanne University Hospital, Lausanne, Switzerland.

4 Department of Internal Medicine, Kantonsspital Olten, Olten, Switzerland.

5 Division of Gastroenterology and Hepatology, Stadtspital Triemli, Zurich, Switzerland.

6 Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland.


BACKGROUND ANDAIMS: Vitamin and iron deficiencies are common in patients with inflammatory bowel disease (IBD) as a result of chronic intestinal inflammation, increase in demand, or dietary restrictions. Here, we assessed the frequency of complications in relation to deficiency of iron, folate acid, and vitamin B12 in patients enrolled in the nationwide Swiss Inflammatory Bowel Disease Cohort Study (SIBDCS).

METHODS: A total of 2666 patients were included in the study, 1558 with Crohn's disease (CD) and 1108 with ulcerative colitis (UC).

RESULTS: Iron deficiency anemia was detected in 19.6% of CD patients and 21.6% of UC patients. In CD patients low BMI and nonsmoker status were positively associated with anemia. In both CD and UC, malabsorption syndrome, defined as failure of the GI tract to absorb 1 or more substances from the diet, was found to be significantly associated with anemia (6.2% and 3.8%, respectively) and current steroid use (40% CD, 52.7% UC). In CD patients with ileal (31.7% vs 20%) and colonic (29.9% vs 25%) disease location folate deficiency was significantly higher than in patients with ileocolonic CD or upper GI involvement. In CD patients, vitamin B12 deficiency was associated with the onset of stenosis and intestinal surgery (42.9% vs 32.8% and 46% vs 33% for patients with versus without B12 deficiency).

CONCLUSION: Our data indicate that due to frequent occurrence of deficiency states, regular monitoring and substitution of vitamins and iron are mandatory and may prevent long-term intestinal and extraintestinal complications in IBD patients.

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