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Biomedical subjects

J Lefebvre

Publications and source records attributed to J Lefebvre.

At least 181 records · Page 10Linked to original sources
PubMed1979

[Comparative action of L-dopa and bromocriptine on thyreostimulating hormone (T.S.H.) in primary hypothyroïdism (author's transl)].

The comparative action of fixed I-dopa (500 mg orally) and bromocriptine (2,5 mg orally) doses on T.S.H. of 20 patients (8 men and 12 women) with primary hypothyroïdism was studied. T.S.H. was significantly decreased from first hour with I-dopa (p less than 0.005) and the greater decrease was reached at the second hour. T.S.H. was the thereafter progressively increased and was like basal value at the fifth or the sixth hour of the test. T.S.H. was likewise significantly decreased from first hour with bromocriptine (p less than 0,01), but the decrease was progressive during the six hours and the greater decrease was reached at the sixth hour (p less than 0,005). The decreased T.S.H. was greater for woman than for man as much with I-dopa (p less than 0,005), as with bromocriptine (p less than 0,002). The greater decrease was the same with I-dopa or bromocriptine. These results were comparatively discussed with others. They favoured an inibiting action of dopaminergic axis on T.S.H. secretion in primary hypothyroïdism.

Adult↗
PubMed1979

["Low triiodothyronine (T3) syndrome": "thyroxine (T4) euthyroidism" evidence (author's transl)].

As first described in serious systemic illnesses isolated decreased T3 plasma concentration was related to impaired peripheral conversion of T4, to T3 with preferential production of reverse T3 (rT3). A "low T3 syndrome" was seen in 47 out of 109 patients with extra-thyroidal diseases. Metabolic state, TSH and TSH responses to TRH were normal despite of low T3 concentration. Euthyroidism seems mainly due to T4 itself in these patients.

Aged↗
PubMed1979

[Orthostatic hypotension in complicated diabetes mellitus: study of the renin-angiotensin-aldosterone system (author's transl)].

Plasma renin activity (P.R.A.) and plasma aldosterone (P.A.) were studied basally and after various stimuli in eight diabetic subjects with orthostatic hypotension and autonomic neuropathy. Five of them had chronic renal failure and proteinuria. On a diet containing 100 mEq Na/24 H, mean P.R.A. was 0,80 +/- 0,32 ng/ml/h in the supine position and 0,95 +/- 0,43 ng/ml/h in the upright position (N.S.); mean P.A. was 111 +/- 77 pg/ml in the supine position and 234 pg/ml in the upright position (p less than 0,01). On a diet containing 10 mEq Na/24 H, mean P.R.A. was 1,54 +/- 0,76 ng/ml/h in the supine position and 2,44 +/- 1,53 ng/ml/h in the upright position (N.S.). There was little stimulation of P. R. A. by low sodium intakes. After furosemide (n = 6), epinephrine + norepinephrine (n = 4) or diazoxide (n = 2), there was no stimulation of P.R.A. and P.A. Thus in diabetic patients with orthostatic hypotension and autonomic neuropathy basal values of P.R.A. and P.A. are in the normal range but there is dysregulation of renin-angiotensin-aldosterone system.

Adult↗
PubMed1978

[Pituitary adenoma with alpha, 17-39 ACTH and beta, MSH cells, without hypercorticism (author's transl)].

In one case of pituitary basophil adenoma, the majority of the cells contains numerous small granulations which, by using immunohistoenzymatic technique, react with alpha, 17-39 ACTH and beta, MSH antisera. The reaction with anti beta, 1-24 ACTH is negative. The radioimmunoassay of ACTH reveals an increase of plasmatic ACTH, but the cortisol cycle stays low. This data suggests that this functional adenoma releases a product of which has an immunological relationship with ACTH, without biological activity.

Adenoma, Basophil↗
PubMed1978

[Serum thyroid hormones in hyperthyroid patients treated with carbimazole (author's transl)].

Serum thyroxine (T4), triiodothyronine (T3) and thyrotropin (T.S.H.) were measured in 32 hyperthyroid patients treated with carbimazole. A discrepancy between serum T4 AND T3 was present in 73 of 131 measurements: --normal T3 with increased T4 in 6 measurements; --increased T3 with normal T4 in 16 measurements: five times only there was a clinical hyperthyroidism; --normal T3 with decreased T4 in 49 measurements: three times only there was a clinical hypothyroidism. Serum T.S.H. level was increased in 13 of 19 measurements made in this group, state named "compensated hypothyroidism" according to Patel and Burger.

Carbimazole↗
PubMed1978

[Phaeochromocytoma with hypokalaemia (two cases) (author's transl)].

Two cases of phaeochromocytoma with hypokalaemia are reported. In the first, a carcinoma, hypokalaemia was potentially secondary to hyperreninaemia and hyperaldosteronism in association with probably paraneoplastic hypercorticism. The other was benign and the origin of isotopically demonstrated potassium deficiency was less clear, because hyperreninaemia, hyperaldosteronism and hypercortisolism were moderate.

Adrenal Gland Neoplasms↗