Serum levels of parathyroid hormone and markers of bone metabolism in patients with rheumatoid arthritis. Relationship to disease activity and glucocorticoid treatment
2001
Objective : To evaluate the influence of inflammatory activity and glucocorticoid (GC) treatment on serum parathyroid hormone (s-PTH) and bone metabolism in patients with rheumatoid arthritis (RA). Furthermore, in patients with active RA, to examine the PTH secretion and Ca 2 + set point before and after treatment with GC. Methods : A range of biochemical markers of bone metabolism and calcium homeostasis were measured in 95 patients with definite RA stratified into groups according to disease activity and GC treatment. In a subgroup of 12 patients with active disease, initiating slow-acting-anti-rheumatic-drugs (SAARDs) - GC, the PTH secretion and calcium set point were evaluated by use of the Cica clamp technique before and after 1 month of treatment. Results : S-osteocalcin, s-total alkaline phosphatase (s-TAP) and s-carboxyterminal crosslinked telopeptide of type I collagen (s-ICTP) were elevated in all groups. The levels of urine pyridinoline (Pyr) and s-albumin-corrected calcium (s-AlbCorrCa 2 + ...
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