Lean body mass and muscle protein breakdown were evaluated in euthyroid and hyperthyroid subjects by measuring the urinary excretion of creatinine and 3-methylhistidine. Since catecholamines probably have an inhibitory effect on muscle protein catabolism through a beta-receptor mechanism, the effects of propranolol on 3-methylhistidine excretion were also evaluated in hyperthyroid subjects. Hyperthyroid subjects had a lower lean body mass (34.9 +/- 6.3 kg versus 47.7 +/- 8.9 kg, p less than 0.001) and a greater 3-methylhistidine excretion (25.1 +/- 7.4 versus 19.0 +/- 4.8 mumol/mmol creatinine, p less than 0.05) than euthyroid subjects. Propranolol administered orally to hyperthyroid subjects decreased pulse rate (p less than 0.01) and plasma triiodothyronine concentrations (from 5.40 +/- 2.28 to 3.61 +/- 1.61 nmol/l, p less than 0.01), but did not modify urinary 3-methylhistidine excretion (24.8 +/- 8.7 versus 25.1 +/- 7.4 mumol/mmol creatinine). These results suggest that muscle wasting in hyperthyroidism is related to increased protein catabolism. This increased protein breakdown is not modified by short term administration of propranolol, a beta-blocking agent widely used in the management of hyperthyroidism.

Adult↗

PubMedDate not supplied

[Surgical treatment of Graves' disease (author's transl)].

135 patients with goiter treated for Graves' disease have been followed during 10 years (12) 5 to 1 years (64) 1 to 5 years (59) after surgical treatment. The incidence of hypothyroidism increases with the delay (23 % after 1 year, 32,6 % after 5 years, 37,8 % after 10 years). The incidence of relapses is similar (7,4 % after 1 year, 15,5 % after 5 years, 22,2 % after 10 years). There is no predictive value of clinical and biological data. Only the limits of thyroidectomy and the pathological findings can inform on the post operative evolution : relapses are more frequent after subtotal bilateral thyroidectomy, hypothyroidism is more frequent after one total lobectomy + subtotal lobectomy on the other side and in the case of large lymphocytic infiltration.

Adult↗

PubMedDate not supplied

[Effect of thyroid function on ketogenesis (author's transl)].

Thyroid hormone effects have been studied in both rats and human. In rats ketone body levels are increased by thyroid hormone excess at the initial phase of starvation. Glucose levels are also increased at the initial and late phase of starvation. Ketone bodies production of isolated liver cells from thyroidectomized fed rats (14 +/- 0,2 muMol/g/h) are decreased when compared with cells from thyroidectomized fed rats treated with triiodothyronine 63 +/- 3 muMol/g/h). These changes are related to a direct effect of T3. Ketone bodies levels are increased in Grave's diseases. The increase is significantly correlated to thyroid hormone levels.

Animals↗

PubMedDate not supplied

[Metastatic thyroid carcinoma with hyperthyroidism (author's transl)].

Eight years after subtotal thyroidectomy for thyroid carcinoma, a patient developped multiple metastasis in bones and liver with high radioiodine uptake. This patient had clinical and biological thyrotoxicosis with low iodine uptake in the cervical remaining thyroid tissue and TSH secretion was not stimulated by TRH. Administration of 240 millicuries of 131 I led to hypothyroidism, to clinical regression of liver metastasis and to disappearance of extra-cervical iodine uptake. Eleven similar case have been reported in the literature.

Bone Neoplasms↗