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Biomedical subjects

O H Sorensen

Publications and source records attributed to O H Sorensen.

16 recordsLinked to original sources
PubMed1977

The hepatic conversion of vitamin D in alcoholics with varying degrees of liver affection.

The seasonal variations in circulating 25-hydroxycholecalciferol (25-HCC) were studied in 102 alcoholics with fatty liver disease without histologic signs of cirrhosis and in 35 patients with alcoholic cirrhosis. The mean levels were compared with those of normal persons. Alcoholics had generally lower 25-HCC values than the controls, particularly in the summer. This was primarily explained by insufficient diet and reduced exposure to sunshine. The ability of the liver to hydroxylate in the 25-position was studied in three groups of alcoholics with 1) fatty liver disease without cirrhosis, 2) compensated cirrhosis, 3) severely incompensated liver cirrhosis. All three groups exhibited a significant increase in serum 25-HCC following the peroral administration of cholecalciferol at a dose of 1 200 U daily for 7 days. Similar rises were seen 7 days after a single injection of 10 000 U cholecalciferol. This indicates a normal intestinal absorption of vitamin D, even in advanced alcoholic liver disease, and is inconsistent with a severely damaged 25-hydroxylation capacity in these patients. Osteomalacia due to impaired liver hydroxylation of vitamin D can hardly explain the increased fracture rate and the decreased bone mass, which have been described in alcoholics.

Alcoholism↗
PubMed1977

The interrelationships between serum 25-hydroxycholecalciferol, serum parathyroid hormone and bone changes in anticonvulsant osteomalacia.

Serum 25-hydroxycholecalciferol (25-HCC) and serum parathyroid hormone (iPTH) were measured in 59 randomly selected adult epileptic outpatients receiving chronic anticonvulsant therapy. Quantitative morphometric analysis of iliac crest biopsies was performed. A mild degree of osteomalacia was found which was inversely correlated to dietary vitamin D intake. Serum 25-HCC was reduced in the epileptic patients compared to a control group, although dietary intake of vitamin D was higher than the mean daily intake in the Danish population. Serum 25-HCC was positively correlated to dietary vitamin D intake, but not correlated to the severity of bone changes, indicating that other factors than circulating 25-HCC are responsible for the development of anticonvulsant osteomalacia. Serum 25-HCG was inversely correlated to serum iPTH in patients with a low dietary calcium intake. The mean value of serum iPTH was not increased, and there was no correlation between serum iPTH and bone morphometry.

Adolescent↗
PubMed1977

Effect of 1alpha-hydroxycholecalciferol in senile osteoporosis and in bone loss following prednisone treatment.

Synthetic 1alpha-hydroxycholecalciferol, a potent vitamin D analogue, was given daily together with calcium to seven patients with senile osteoporosis and to three patients with prednisone-induced bone loss. Quantitative bone histology indicated increased formation and mineralization after three months of treatment. The bone resorption was reduced, a finding supported by a decrease in the urinary hydroxyproline excretion. Photon absorptiometry of the forearm showed a significant rise in the bone mineral content, in accordance with the histological findings. Serum calcium rose in all patients and severe hypercalcemia developed in one case. Urinary excretion of calcium and magnesium increased significantly. The findings indicate that treatment with 1alpha-hydroxycholecalciferol may be useful in osteoporosis due to aging or following corticosteroid administration. The patients must be carefully followed up because of the risk of hypercalcemia.

Aged↗
PubMed1976

The importance of growth hormone and liothyronine in induced hypocalcaemia in hypophysectomized animals.

The resistance to hypocalcaemia induced by synthetic salmon calcitonin (SCT) was studied in intact and hypophysectomized rats. The recovery from hypocalcaemia was greatly impaired in the latter group, but this was normalised by small doses of purified human growth hormone (GH). The initial hypocalcaemic response to SCT was delayed in the hypophysectomized rats. This was not affected by treatment with GH, but normalised by substitution with liothyronine. We conclude that GH accelerates the recovery from hypocalcaemia in hypophysectomized animals, perhaps by a stimulation of parathyroid activity, while thyroid hormone accelerates the initial hypocalcaemic response to SCT, probably by restoring the reduced rate of bone resorption.

Adrenocorticotropic Hormone↗
PubMed1975

Treatment of osteoporosis of ageing with 1alpha-hydroxycholecalciferol.

Seven patients with osteoporosis of ageing were treated with synthetic 1alpha-hydroxycholecalciferol (1alpha-H.C.C.) for 3-4 months. The compound was given at a daily oral dose of 2 mug together with an oral supplement of 1 g of calcium. Clinically there was a striking improvement in the patients' physical fitness. Increased bone formation and mineralisation were seen on iliac-crest bone biopsy, and this was supported by an increased osteoblastic activity demonstrated by histochemical measurement of alkaline-phosphatase activity. Bone histology furthermore showed a reduced bone resorption, which was supported by a reduced urinary excretion of total hydroxyproline. Photon absorptiometry of the forearm accorded with the histological findings, showing a significant increase in the bone mineral content. Serum-calcium rose in all patients, one developing a severe transitory hypercalcaemia. The urinary excretion of calcium and magnesium increased significantly. The serum concentrations of 25-hydroxycholecalciferol and parathyroid hormone were not significantly affected by the treatment. It is concluded that 1alpha-H.C.C. is an effective tool in the treatment of senile osteoporosis.

Administration, Oral↗
PubMed1975

25-Hydroxycholecaliferol and fractures of the proximal.

Plasma 25-hydroxycholecalciferol (25-H.C.C.) has been measured in 67 consective cases of fracture of the proximal femur. The values found in these patients were not different from values found in these patients were not different from those in control groups at the same time of the year. Plasma 25-H.C.C. was not correlated to plasma calcium or phosphorus, the Ca times P product, or the alkaline phosphatase. X-rays showed Looser zones in only 1 patient, in whom the lowest plasma 25-H.C.C. was found. Osteomalacia is not uncommon among elderly people in Denmark, but it is more likely to depend on a decline in the renal efficiency to convert 25-H.C.C. to 1,25-dihydroxycholecalciferol than a low dietary intake of vitamin D.

Adult↗