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Following primary hyperparathyroidism surgery 1600 IU vitamin D was not enough to help - RCT Feb 2015

Eur J Endocrinol. 2015 Feb;172(2):181-7. doi: 10.1530/EJE-14-0757. Epub 2014 Nov 20.
Åberg V1, Norenstedt S1, Zedenius J1, Sääf M1, Nordenström J1, Pernow Y1, Nilsson IL2.

VitaminDWiki Summary

1t600 IU for 1 year
Raised average blood level to 30 ng
Not enough to help


OBJECTIVE:
Vitamin D insufficiency is common in primary hyperparathyroidism (pHPT). Patients with pHPT frequently have a reduced health-related quality of life (HRQoL). Our objectives were to evaluate whether HRQoL in pHPT is associated with vitamin D insufficiency and whether vitamin D supplementation after parathyroidectomy (PTX) could improve HRQoL.

DESIGN:
A randomized, double-blind study (ClinicalTrials.gov identifier: NCT00982722).

METHODS:
The study included 150 pHPT patients randomized, 6 weeks after PTX, to daily treatment with either cholecalciferol 1600 IU and calcium carbonate 1000 mg (D+) or calcium carbonate alone (D-). HRQoL was estimated with SF-36 before and after PTX and after 12 months of study medication.

RESULTS:
Three-quarters (77%) of the pHPT patients had vitamin D insufficiency, defined as 25OHD <50 nmol/l. The pHPT patients scored lower than a reference population in all domains of SF-36. A total of 135 patients completed the entire study period. Improvements in nearly all domains were registered at the follow-up 6 weeks after PTX. At the end of the study medication period, the D+ group had a significantly higher median serum (s-) 25OHD concentration (76 (65; 93) (lower; upper interquartile ranges) vs 48 (40; 62) nmol/l, P<0.001) and a lower plasma (p-) parathyroid hormone concentration (40 (34; 52) vs 49 (38; 66) ng/l, P=0.01) than the D- group. The improvements in HRQoL remained unchanged at the follow-up 1 year after PTX. Postoperative vitamin D supplementation had no obvious effect on HRQoL.

CONCLUSION:
PTX resulted in significant improvements in HRQoL. Despite a high prevalence of vitamin D insufficiency, 1 year of postoperative vitamin D supplementation had no obvious beneficial effect on HRQoL.

© 2015 The authors.

PMID: 25414430

[http://eje-online.org/content/172/2/181.long|Full free text online}