title: Transient effectiveness of vitamin D2 therapy in pediatric cystic fibrosis patients.
abstract: BACKGROUND
  The effectiveness of current treatment recommendations for vitamin D insufficiency in children with CF is unknown. Therefore, we assessed the effectiveness of vitamin D(2) 50,000 IU once daily for 28 days for vitamin D insufficiency.
  
  
  METHODS
  Retrospective chart review of pediatric CF patients from 2006-2008. Vitamin D(2) 50,000 IU daily for 28 days was given to patients with 25-OHD <30 ng/mL and repeat 25-OHD levels were obtained after completion of therapy.
  
  
  RESULTS
  One hundred forty-seven levels from 97 individuals were assessed. Success of treatment was 54% (n=80/147). Seventeen of 39 patients (43%) followed for an additional 6-18 months were able to maintain levels of >or=30 ng/mL.
  
  
  CONCLUSIONS
  Vitamin D(2) 50,000 IU daily for 28 days was effective in correcting vitamin D insufficiency in approximately 50% of subjects. However, almost half of successfully treated patients were unable to maintain normal 25-OHD levels >6 months after completion of therapy, implying that this effect is transient.
authors.affiliation: Eudowood Division of Pediatric Respiratory Sciences, The Johns Hopkins Medical Institutions, Baltimore, MD 21287, USA.
authors.forename: Deanna M
authors.initials: DM
authors.lastname: Green
authors.forename: Amanda R
authors.initials: AR
authors.lastname: Leonard
authors.forename: Shruti M
authors.initials: SM
authors.lastname: Paranjape
authors.forename: Beryl J
authors.initials: BJ
authors.lastname: Rosenstein
authors.forename: Pamela L
authors.initials: PL
authors.lastname: Zeitlin
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Mogayzel
mesh_terms: D015652:25-Hydroxyvitamin D 2 / Q000097:blood; D000293:Adolescent; D002112:Calcifediol / Q000097:blood; D002648:Child; D002675:Child, Preschool; D003550:Cystic Fibrosis / Q000150:complications*; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D004872:Ergocalciferols / Q000008:administration & dosage*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D015995:Prevalence; D012189:Retrospective Studies; D012621:Seasons; D013997:Time Factors; D016896:Treatment Outcome; D014808:Vitamin D Deficiency / Q000097:blood / Q000150:complications* / Q000188:drug therapy* / Q000453:epidemiology; D014815:Vitamins / Q000008:administration & dosage*
chemical_list: D004872:Ergocalciferols; D014815:Vitamins; D015652:25-Hydroxyvitamin D 2; D002112:Calcifediol