The safety of vitamin D replacement in subjects with primary hyperparathyroidism (PHPT) and coexistent vitamin D deficiency is not well established.Objective
To evaluate the safety of vitamin D replacement in PHPT.Data Source
Data were searched from Medline, EMBASE, Cochrane CENTRAL and abstracts form annual scientific meetings of various international bone and mineral societies.Study Selection
Studies examining the effect of preoperative vitamin D replacement in patients with PHPT and coexisting vitamin D deficiency, irrespective of year and language of the publication were included in the present meta-analysis.Data Extraction
Data were extracted from text of the included publications or abstract of conferences.Data Synthesis
Ten studies enrolling 340 subjects with PHPT were analysed in this meta-analysis. After vitamin D replacement, there was significant increase in 25(OH) D levels by 55·3 nmol/l (95% CI 33·3–77·3), reduction in serum parathyroid hormone levels by 3·5 pmol/l (5·8 to −1·2) without change in serum calcium (−0·08 mmol/l, −0·2 to +0·03) and urinary calcium levels (0·72 mmol/24 h, P = 0·2) compared to baseline.Conclusion
Vitamin D replacement in subjects with PHPT and coexistent vitamin D deficiency increase 25 (OH) D and reduce serum PTH significantly without causing hypercalcaemia and hypercalciuria. The finding of the study needs to be confirmed by a large randomized trial in patient with PHPT and coexistent vitamin D deficiency.