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Biomedical subjects

J M Fernández Real

Publications and source records attributed to J M Fernández Real.

7 recordsLinked to original sources
PubMed2001

[Insulin secretion and insulin sensitivity in relation to glucose tolerance in a group of subjects at a high risk for type 2 diabetes mellitus].

BACKGROUND: Oral glucose tolerance test was evaluated, as well as, insulin sensitivity/secretion in a group of subjects at risk for type 2 diabetes mellitus. METHOD: Metabolic profile of subjects included in the new category, impaired fasting glucose (IFG), was also evaluated. RESULTS: IFG and impaired glucose tolerance identify different alterations in glucose homeostasis. CONCLUSIONS: Those subjects with IFG are heterogeneous in their oral glucose tolerance. They display defects not only in insulin sensitivity but also in their capacity to compensate for it.

Adult↗
PubMed1994

Study on growth hormone and insulin secretion in myotonic dystrophy.

Growth hormone (GH) levels were measured in 12 patients with myotonic dystrophy (MD; 7 men and 5 women, aged 21-49 years) and 14 volunteers after administration of 100 micrograms GH-releasing hormone (GHRH; 1-29). A 75-g oral glucose tolerance test was carried out to determine glucose, insulin, plasma C-peptide, and urinary C-peptide. The GH level in six MD patients responded normally to GHRH (group I), with a peak of 17.1 +/- 1.46 micrograms/l, compared with controls (27.8 +/- 19.6 micrograms/l, NS), and that in the other six patients responded subnormally, with a peak of 3.15 +/- 1.46 micrograms/l, lower than in controls and in group I patients (P < 0.001). In group I the insulin response to the glucose tolerance test showed hyperinsulinism and was lower than that in group II patients; stimulated C-peptide was also higher in group II than in group I and in controls; urinary C-peptide levels were parallel to those in previous data. In all MD patients there were a negative correlation between absolute values of GH response to GHRH and insulin response to glucose tolerance test (r = -0.79, P < 0.001). Our data suggest that the failure in GH release and peripheral insulin action is due to a generalized defect in cellular membrane function in MD patients.

Adult↗
PubMed1992

[The importance of computerized axial tomography in the etiological diagnosis of Addison's disease].

Sixteen cases of newly diagnosed Addison disease were studied by CT scan. An initial diagnosis was performed according to the clinical data of each patient, and a second diagnosis after examining the abdominal CT scan. According to the second diagnosis there were six patients with primary adrenal failure of probable autoimmune origin, six tuberculosis, two metastatic, one undetermined and one hemorrhagic. The second diagnosis coincided with the first one in 10 cases (62.5%), but was different in six cases (37.5%). Information obtained by CT scan modified the therapeutic attitude in 4 cases (25%). The main morphologic patterns of adrenal glands in CT scan (atrophy, calcification and enlargement) are commented as well as the importance of CT scan in the study of the more common etiologies of Addison's disease (tuberculosis, autoimmune, neoplastic metastasis and hemorrhage). It is concluded that the information obtained by CT scan is important in the etiological diagnosis of Addison disease and it is advised to perform it in all newly diagnosed cases.

Addison Disease↗
PubMed1991

[Pituitary apoplexy: analysis of endocrine function in 17 cases].

BACKGROUND: From a neurological standpoint, pituitary apoplexy (PA) is a well defined syndrome. There are few systematic studies addressing pituitary hormone secretion after a PA episode. The aim of the present study was to assess the frequency and degree of endocrine dysfunction due to PA. METHODS: In 17 consecutive patients, the secretion of growth hormone (GH), the pituitary-adrenal axis status, thyrotropin (TSH), prolactin and gonadotropins (LH, FSH) were evaluated after the administration of insulin, thyrotropin releasing hormone (TRH) and gonadotropin-releasing hormone (LHRH) after an episode of PA. 20-90 days after surgery the measurements were repeated. Antidiuretic hormone (ADH) was measured by plasma/urine osmolality after water deprivation and, in some cases, by administration of hypertonic saline. RESULTS: The most commonly found deficiency was that of GH (84%), which in two cases resulted in cure of acromegaly, followed by that of LH (78%). Pituitary-adrenal dysfunction was improved in two patients after surgery. In all cases except one there was a reduced secretion of at least two hormones. If serum prolactin was reduced, the rest of pituitary function was usually impaired. In one case, permanent diabetes insipidus developed after PA. The prevalence of PA in pituitary adenomas was 9%. CONCLUSIONS: Pituitary hormone secretion after a PA episode is almost invariably impaired. This impairment may be reversed after surgery. Hypoprolactinemia is an indicator of pituitary hypofunction.

Adenoma↗