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Aims There is currently no medical therapy that can prevent the progression of aortic valve stenosis (AS). Recent data highlight a possible relationship between bone metabolism and AS progression but prospective data are lacking.Methods and results Serum levels of calcium, phosphorus, creatinine, 25-OH vitamin D, intact parathyroid hormon (iPTH), C-terminal-telopeptide of type-1-collagen (CTX) and osteocalcin were assessed at baseline in 110 elderly patients (age ≥70 years) with at least mild AS. CTX/osteocalcin ratio was calculated as a marker of bone remodelling balance. AS severity was assessed at baseline and 1-year based on the mean gradient. Two-thirds of patients had low 25-OH vitamin D and 20% had secondary hyperparathyroidism. AS progression was not associated with age, glomerular filtration rate (GFR), calcium and phosphorus levels, calcium–phosphorus product, but significantly with iPTH, CTX/osteocalcin and vitamin D status (all P < 0.01). There was no correlation between iPTH and CTX/osteocalcin (R = 0.04, P = 0.70) and AS progression was associated with CTX/osteocalcin (R = 0.42, P = 0.009), but not with iPTH (R = 0.10, P = 0.55) in patients with normal vitamin D levels, whereas it was associated with iPTH (R = 0.47, P < 0.001) and not with CTX/osteocalcin (R = 0.04, P = 0.73) in those with low vitamin D levels, especially if mild renal insufficiency was present (R = 0.61, P < 0.001).Conclusion In elderly patients with AS, we observed an association between AS progression and vitamin D, iPTH and CTX/osteocalcin ratio and their respective influence varied according to the vitamin D status. In patients with normal vitamin D levels, AS progression was associated with a bone resorptive balance, whereas in patients with low vitamin D levels, AS progression was associated with iPTH and secondary hyperparathyroidism, especially if mild renal insufficiency was present. These findings may have important prognostic and therapeutic implications.
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