title: Parathyroid hormone, 25-hydroxyvitamin D and 1,25-dihydroxyvitamin D concentration in elderly patients.
abstract: In 50 patients of a geriatric hospital (33 women, aged 65-96 years, mean age 80 years, and 17 men, aged 68-91, mean age 78.3 years) calcium, albumin, phosphate, urea, creatinine, parathyroid hormone, 25-hydroxyvitamin D, and 1,25-dihydroxyvitamin D were determined. Forty patients with serum creatinine levels up to 1.4 mg/dl (124 mumols/l) and 10 patients with creatinine concentrations greater than or equal to 1.5 mg/dl (132 mumols/l) were evaluated. In patients with normal creatinine, a positive correlation was found between parathyroid hormone and age (r = 0.41; P less than 0.01). In patients with elevated creatinine, negative correlations were found in 1,25-dihydroxyvitamin D and calcium (r = -0.724; P less than 0.05), 1,25-dihydroxyvitamin D and creatinine (r = -0.79; P less than 0.01) and 1,25-dihydroxyvitamin D and phosphate (r = -0.87; P less than 0.002). The best correlation was observed in patients with elevated serum creatinine for 1,25-dihydroxyvitamin D and phosphate (r = -0.91; P less than 0.001). The results suggest that low levels of calcium and phosphate stimulate the 1-hydroxylation of 25-hydroxyvitamin D even in advanced age and that the calcium metabolism of these patients is frequently disturbed. Nineteen patients had low levels of 25-hydroxyvitamin D, indicating an insufficient supply of vitamin D or rare exposure to sunlight. In 49 of 50 patients, one ore more of the parameters of calcium metabolism were outside the normal range.
authors.affiliation: Krankenhaus Bethanien Heidelberg.
authors.forename: P
authors.initials: P
authors.lastname: Oster
authors.forename: T
authors.initials: T
authors.lastname: Müller
authors.forename: H
authors.initials: H
authors.lastname: Schmidt-Gayk
authors.forename: G
authors.initials: G
authors.lastname: Schlierf
mesh_terms: D000368:Aged; D000375:Aging / Q000097:blood*; D002112:Calcifediol / Q000097:blood*; D002117:Calcitriol / Q000097:blood*; D002118:Calcium / Q000097:blood; D003404:Creatinine / Q000097:blood; D005260:Female; D006801:Humans; D008297:Male; D010281:Parathyroid Hormone / Q000097:blood*; D010710:Phosphates / Q000097:blood; D012016:Reference Values; D012044:Regression Analysis
chemical_list: D010281:Parathyroid Hormone; D010710:Phosphates; D003404:Creatinine; D002117:Calcitriol; D002112:Calcifediol; D002118:Calcium