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Biomedical subjects

M Linquette

Publications and source records attributed to M Linquette.

At least 235 records · Page 13Linked to original sources
PubMedDate not supplied

[Proceeding: Production rate, metabolic clearance rate and mean plasma concentration of cortisol in hyperthyroidism (author's transl)].

The adrenocortical function was studied in 23 patients with hyperthyroidism and compared with a group of 15 normal subjects. Parameters of adrenal function were determined with 1,2(3)H-cortisol. The half-life of cortisol is significantly shortened in hyperthyroidism, as compared to normal subjects (49,5 +/- 6,6 min vs 68,3 +/- 10,5 min) and metabolic clearance rate is increased (418,5 +/- 89,5 L/24 h vs 237,5 +/- 48,5 L/24 h, for normal subjects). The production rate of cortisol, calculated from specific and cumulate activities of THE and THF is increased in hyperthyroidism expressed as mg/24 h or mg/m2/24 h (respectively : 26,7 +/- 7,8 mg/24 h vs 15,7 +/- 3 mg/24 h and 16,9 +/- 4,6 mg/m2/24 h vs 9,5 +/- 1,8 mg/m2/24 h). The mean plasma concentration, calculated as the radio (see article) is not statiscally different in hyperthyroid and normal subjects (6,8 +/- 2,1 microg/100 ml vs 7,3 +/- 1,9 microg/100 ml). 7 patients were reinvestigated after treatment of thyrotoxicosis when they were clinically and biologically in euthyroid state. All the values were normalized, without statistically significant difference from control (T 1/2 = 65,4 +/- 18 min, Metb Cl. Rate : 255 +/- 64,5 L/24 h, production rate : 15,6 +/- 1,8 mg/24 h and 9 +/- 1,4 mg/m2/24 h. mean plasma concentration : 6,8 +/- 2,8 microg/100 ml). Shortened cortisol half life, increased metabolic clearance rate and production rate, and normal mean plasma concentration have been reported in hyperthyroidism (Peterson, Copinschi, Gallagher). These changes, secondary to thyroid hormone excess, are the consequences of increased hepatic catabolism of cortisol. The activity of 11 OH steroid deshydrogenase is increased, as demonstrated by increased ratio (see article) in normal subjects (0,001 less than p less than 0,005). There is a high proportion of 17 kéto metabolites (E, DHE, THE) whose feed-back effect is weak as compared to 17 OH metabolites (F, DHF, THF). The hypothalamo-hypophyso-adrenal system is stimulated to maintain a normal plasma concentration. The fact that the mean plasma concentration is normal despite the increased production rate suggest that changes are rather due to increased catabolism than to central effect of thyroid hormones.

Hydrocortisone↗
PubMedDate not supplied

[Proceedings: Sulpiride effects on plasmatic gonadotropins in women (author's transl)].

The study of longitudinal evolution of plasmatic gonadotropins in women receiving sulpirid, a psychotropic drug with a strong anti-ovulatory effect, shows the coexistence of anovulation and the peristance of a physiological pattern of gonadotropins during the first cycle of treatment. It also shows the persistance of LH peaks comparable to preovulatory levels more than one year after the initiation of therapy. However, the basal line became very unsteady. This study suggests the presence of two types of perturbations with sulpirid. A hypothalamic-hypophyseal mild action and, an ovarian resistance to gonadotropins resulting from the hyperprolactinism induced by sulpirid.

Female↗
PubMedDate not supplied

[Proceedings: Plasma renin activity in management of Addison's disease (author's transl)].

13 patients with Addison's disease, 7 men and 6 women, 19 to 61 years old, were investigated. Plasma Renin Activity (P.R.A.) is measured by radioimmunoassay of Angiotensin I (ng/ml/h) in the supine (S) and the upright (U) position. These patients are studied before treatment and under normal sodium diet in 11 cases: the P.R.A. value is constantly increased [5 men: MS = 10,09 (range: 6,2-12,5) and MU = 23,22 (range : 17,1-31,09), 6 women : MS = 24,48 (range : 3,46-45,04) and MU = 42,23 (range : 42,23 (range 17,37-69,34), to be compared with our normal values (M +/- S.D.) : MS = 1,02 +/- 0,39 and MU = 2,56 +/- 0,99 for men - MS = 0,82 +/- 0,14 and MU = 2,32 +/- 0,93 for women in follicular phase - MS = 1,45 +/- 0,56 and MU = 4,59 +/- 1,63 for women in luteinic phase. After dietary sodium restriction (10 mEq/24 h) in 2 cases, the P.R.A. is significantly increased with respect to the basal value]. Under Hydrocortisone alone (25 to 30 mg/24 h) and normal sodium diet, 4 patients kept significantly increased P.R.A. values. Under Hydrocortisone (20 to 40 mg/24 h) and 9-alpha-fluorohydrocortisone (50 to 100 microgrammes/24 h) for 6 days to 14 months, the P.R.A. value decrease into the normal range [men : MS = 1,02 (range : 0,54-1,92) and MU = 1,68 (RNAGE : 0,81-2,57) - 2 Menopausal women : MS = 1,55 and MU - 1,16. The P.R.A. measurement seems useful in the adaptation of Addision's disease treatment.

Addison Disease↗