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T Lucas

Publications and source records attributed to T Lucas.

At least 19 recordsLinked to original sources
PubMed1995

Hypothalamic-pituitary dysfunction in patients with craniopharyngioma.

OBJECTIVE: Previous studies of preoperative pituitary function in patients with craniopharyngioma have been limited in scope and have focused on children. We have evaluated the impact of craniopharyngiomas and their surgical treatment on pituitary function in a large group of mostly adult patients. DESIGN: We performed a retrospective study of patients treated at our centre between 1980 and 1992. PATIENTS: Twenty-two men and 13 women, most of them adults, treated surgically for craniopharyngioma during the above period. MEASUREMENTS: Serum glucose, GH, LH, FSH, TSH and cortisol were measured both before and after a combined insulin induced hypoglycaemia, GnRH and TRH test. Basal concentrations of thyroid hormones, PRL and gonadal steroids were also measured. Preoperative computed tomographic scan was performed in all patients, and a detailed study of visual function before and after surgery was available for 32 of them. Endocrine function was reevaluated post-operatively. RESULTS: In preoperative studies, 29 patients had some anterior pituitary deficit and 13 had diabetes insipidus. The most common abnormality was gonadotrophin deficiency, followed by GH deficiency. Dynamic studies suggested a hypothalamic origin for these deficits. In post-surgical evaluation, impaired pituitary function was observed in most patients. Panhypopituitarism was present in 28 cases and diabetes insipidus in 24. CONCLUSIONS: Our report illustrates the high incidence of endocrine deficits in patients with craniopharyngioma. Additional hypothalamic-pituitary dysfunction usually occurs following surgical treatment of these tumours.

Adolescent↗
PubMed1991

[Treatment of solitary toxic thyroid nodule with 131I: results in 43 patients].

BACKGROUND: Evaluation of the therapy with high-dose 131I in solitary toxic thyroid adenoma, with particular attention to the effects on thyroid function and on the nodular size. METHODS: A retrospective study of 43 patients with solitary thyroid nodule treated with radioactive iodine (mean dose 26.6 mCi, range 10-35) and followed up for 49.7 +/- 36.6 months (range 6-186) with periodical clinical, laboratory and echographic evaluations. RESULTS: Thirty-two patients (74.4%) had a normal thyroid function during follow-up. Five (11.6%) remained with hyperthyroidism and in 6 (13.9%) hypothyroidism developed 6-30 months after the administration of radioactive iodine. Three of these 6 had subclinical hypothyroidism, with mild increases in serum thyrotropin (TSH). Neither the development of hypothyroidism nor its persistence were significantly correlated with the initial thyroxin (T4) or triiodothyronine (T3) levels, the nodular size, the 131I dose, the incomplete inhibition of the extranodular thyroid parenchyma or the previous therapy with antithyroid drugs. The nodule diminished in size in 15 cases (38.4%), it disappeared in 9 (23%), it remained unchanged in 12 (30.7%) and it increased in 3 (7.7%). CONCLUSIONS: The treatment of the solitary toxic thyroid nodule with relatively high 131I doses is a safe and effective procedure, with a prevalence of residual hypothyroidism which is lower than previously reported. The disappearance of the nodule was only achieved in a minority of cases.

Adenoma↗
PubMed1991

Results of external pituitary irradiation after unsuccessful transsphenoidal surgery in Cushing's disease.

Fourteen adult patients (10 females and 4 males; age range 20-60 years) with persistent Cushing's disease after transsphenoidal microsurgery were treated with pituitary irradiation. Supervoltage multiportal administration was employed at a total dose of 50 Gy (+/- 0.65 SD). The interval between microsurgery and pituitary irradiation was less than 6 months in 6 patients and more than 6 months in 8. The pituitary-adrenal axis was evaluated postsurgically, before irradiation and every 6 months thereafter. The remaining anterior pituitary function was simultaneously tested. Remission rates at 12 months and 24 months after radiotherapy were 61 and 70%, respectively. Two patients developed TSH deficiency and another gonadotropin deficiency during the follow-up after radiation. We conclude that pituitary irradiation is the treatment of choice for persistent Cushing's disease after unsuccessful surgery because of its high efficiency and low incidence of adverse reactions when compared with other forms of treatment.

Adrenocorticotropic Hormone↗
PubMed1989

[Chronic dysplasia of the respiratory ciliary epithelium].

We report on a 14-year-old Turkish boy who suffered for more than seven years from recurrent pneumonia and bronchiectases. This led to the surgical removal of the left lower lobe. Brush biopsies taken from the bronchus and nose revealed severe dysmorphy of the ciliary epithelium with an altered cell-distribution of the normal surface pattern.

Bronchi↗
PubMed1975

Thromboresistance of glass after glow discharge treatment in argon.

Glow discharge treated (GDT) inorganic materials are sterile and free of all organic contaminants. Such materials implanted in the canine inferior vena cava often demonstrate significant thromboresistance. Standard Pyrex glass tubing was GDT in argon to provide a surface free energy above 70 dynes/cm, slight surface negativity, and other surface-physical modifications of its interface. Chromic acid cleaned lengths of the same tubing, and short segments whose edges were not fire-polished were used as controls. Upon canine implantation, the in vivo results were similar in independent surgical laboratories. The glass was implanted as 1.4 cm long rings or as 5 cm long tubes in separate medical centers according to different protocols. GDT specimens remained patent; all controls accumulated thrombi. A remarkably pure, low critical surface tension, labile protein coating covered all cylindrical lumens after 2 hr in vivo. This coating diminished within 2 weeks and was essentially absent after 480 days, eeven though scanning EM showed evidence of a micron thick luminal film, probably eroding glass. No emboli were found in the implant animal's kidney or lungs at any stage.

Animals↗