Diminished and erratic absorption of ergocalciferol in adult cystic fibrosis patients
Open Access
- 1 March 2001
- journal article
- research article
- Published by Elsevier in The American Journal of Clinical Nutrition
- Vol. 73 (3), 602-606
- https://doi.org/10.1093/ajcn/73.3.602
Abstract
Background: Osteoporosis diminishes the quality of life in adults with cystic fibrosis (CF). Vitamin D deficiency resulting from malabsorption may be a factor in the etiology of low bone mineral density (BMD) in patients with CF. Objective: Absorption of oral ergocalciferol (vitamin D2) and the consequent response of 25-hydroxyvitamin D in 10 adults with CF and exocrine pancreatic insufficiency was compared with that of 10 healthy control subjects. Design: In this pharmacokinetic study, CF patients and control subjects were pair-matched on age, sex, and race. Each subject consumed 2500 μg oral vitamin D2 with a meal. The CF group also took pancreatic enzymes that provided ≥80000 U lipase. Blood samples were obtained at baseline and at 5, 10, 24, 30, and 36 h after vitamin D2 consumption to measure serum vitamin D2 and 25-hydroxyvitamin D concentrations. Results: Vitamin D2 concentrations in all subjects were near zero at baseline. CF patients absorbed less than one-half the amount of oral vitamin D2 that was absorbed by control subjects (P < 0.001). Absorption by the CF patients varied greatly; 2 patients absorbed virtually no vitamin D2. The rise in 25-hydroxyvitamin D in response to vitamin D2 absorption was significantly lower over time in the CF group than in the control group (P = 0.0012). Conclusions: Vitamin D2 absorption was significantly lower in CF patients than in control subjects. These results may help explain the etiology of vitamin D deficiency in CF patients, which may contribute to their low BMD.Keywords
This publication has 19 references indexed in Scilit:
- Osteoporosis in adults with cystic fibrosis.Journal of the Royal Society of Medicine, 1998
- Severe bone pain after intravenous pamidronate in adult patients with cystic fibrosisThe Lancet, 1998
- OSTEOPOROSIS IN PATIENTS WITH CYSTIC FIBROSISClinics in Chest Medicine, 1998
- Bone Mass and Vitamin D Deficiency in Adults with Advanced Cystic Fibrosis Lung DiseaseAmerican Journal of Respiratory and Critical Care Medicine, 1998
- Increased Rate of Fractures and Severe Kyphosis: Sequelae of Living into Adulthood with Cystic FibrosisAnnals of Internal Medicine, 1998
- Severe Osteoporosis Before and After Lung TransplantationChest, 1996
- Bone density in children and adolescents with cystic fibrosisThe Journal of Pediatrics, 1996
- Inflammatory cytokines in cystic fibrosis lungs.American Journal of Respiratory and Critical Care Medicine, 1995
- Osteopenia in adults with cystic fibrosisAmerican Journal Of Medicine, 1994
- The changing epidemiology of cystic fibrosisThe Journal of Pediatrics, 1993