Effect of Vitamin D replacement in Primary Hyperparathyroidism with concurrent Vitamin D deficiency: a systematic review and meta-analysis

INTRODUCTION: We conducted a meta-analysis to assess the effects of vitamin D replacement on biochemical and skeletal parameters in subjects with mild primary hyperparathyroidism (PHPT) and coexistent vitamin D deficiency. EVIDENCE ACQUISITION: A systematic search of all English-language medical literature published from 1980 till May 2016 using Pubmed, Embase and Ovid was performed. Nine observational studies were evaluated after fulfilling the inclusion and exclusion criteria. EVIDENCE SYNTHESIS: A total of 547 patients were examined. All studies used vitamin D2/D3 or calcifediol (25-hydroxyvitamin D3), There was significant improvement of serum 25(OH)D with unchanged serum iPTH level after vitamin D replacement, with pooled d+: 3.10 (95% CI 2.25 to 3.95), p