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Biomedical subjects

V Torres

Publications and source records attributed to V Torres.

At least 37 records · Page 2Linked to original sources
PubMed1993

Chronic hepatitis and cirrhosis: evaluation by means of MR imaging with histologic correlation.

To characterize the relationship between findings on magnetic resonance (MR) images and histologic changes in chronic liver disease, a prospective study was performed in 100 patients with chronic hepatitis and cirrhosis and 28 healthy subjects. Biopsy specimens, obtained in all patients before MR imaging, were evaluated with the histologic activity (HA) index; MR images were obtained with short inversion time inversion-recovery (STIR) and spin-echo sequences. On STIR images, normal livers were iso-intense to fat. Significant differences (P < .001) existed between signal intensity of normal livers and that of diseased livers, which were brighter than normal livers on STIR images. The ratio of signal intensity of liver to that of fat on STIR images was associated with an HA index grouped by severity (P < .05): Patients with higher HA scores had a brighter liver. Signal intensity ratios on MR images were statistically significantly associated with periportal and lobular necrosis and portal inflammation. The signal intensity of liver on STIR images is associated with the degree of histologic severity in patients with chronic liver disease.

Adult↗
PubMed1992

Some morphologic changes induced by Nd:YAG laser on the noncoated enamel surface: a scanning electron microscopy study.

The enamel surface layer of some human teeth was treated with the low-energy Nd:YAG laser at 8 mJ pulse energy. These samples were previously etched with 0.05 M orthophosphoric acid to reduce the surface reflection. The treated samples, as well as the control samples, were widely studied by scanning electron microscopy, and, in the lased group, significant morphologic changes affecting the enamel surface were observed. Those changes reveal principally the loss of the typical surface structure of the acid-etched enamel. The hydroxyapatite prisms were not discernible, and there was a decrease in the roughness of the lased surface enamel. These laser-induced structural changes may be related to the increased resistance to the calcification reported by many authors.

Acid Etching, Dental↗
PubMed1991

Xanthelasmoid mastocytosis.

An 8-year-old girl had small, papular vulval lesions for six years; the lesions were yellowish with numerous surface depressions. Symptoms due to the action of mastocyte mediators were observed. A biopsy specimen showed a dense monomorphous infiltrate of the deep dermis by rounded cells with granular cytoplasm and a round or oval central nucleus. The morphology of the lesions and red-purple metachromatic staining led to the diagnosis of xanthelasmoid mastocytosis. Symptoms were controlled with hydroxyzine. Annual follow-up has shown no evidence of systemic involvement to date. Surgery should be contemplated as a future therapeutic option, in view of the location of the lesions.

Child↗
PubMed1989

[Seroprevalence of AIDS in Chilean male and female prostitutes. II. Male prostitution].

ELISA test to detect HIV-1 antibodies was performed to 65 homosexuals and homosexual male prostitutes in a Sexually Transmitted Diseases (STD) Clinic in Santiago de Chile together with a survey about risk factors. It was found that 40 of them (62%) practice prostitution with a rate of 1.5% clients per day. All the studied group presented dissemination of HIV risk factors like low frequency usage of condom, patients hide their homosexual condition, they have donated blood, they do not manifest an attitude towards changing their behaviors and have had intercourse with the opposite sex. We found 1 (1.54%) seropositive confirmed by Western blot in a homosexual who does not practice prostitution.

Acquired Immunodeficiency Syndrome↗
PubMed1989

[Osseous metastasis of an intracranial angioblastic meningioma: report of a case].

A case of multiple bone metastases from an angioblastic meningioma (intracranial hemangiopericytoma) is reported. From the clinical and pathologic point of view, it is essential to be aware that the hemangiopericytic variant of meningioma (angioblastic meningioma) displays a significantly higher rate of recurrence and extracranial metastasis than other forms of meningioma.

Adult↗
PubMed1988

Fine-needle aspiration biopsy in children: experience in 70 cases.

Results of 70 fine-needle aspiration biopsies (FNAB) were evaluated retrospectively in 61 pediatric patients. Over a period of 9 months all mass lesions suspected being malignant were aspirated. Twelve of the 70 aspirations were performed in children having known tumours, in order to exclude recurrence or metastasis. The others were carried out to obtain a diagnosis. Satisfactory specimens were obtained from 58 (83%). There were 21 benign diagnoses, 36 malignant diagnoses, and 1 with suspected malignancy. Correlation of histologic and cytologic diagnoses was possible in 45 cases. The diagnostic sensitivity and specificity were 95% and 80%, respectively. We have found FNAB more accurate in the diagnosis of malignancies than in benign lesions. The results suggest that this is a useful technique for obtaining a first diagnosis of malignancy, as well as for excluding recurrence or metastatic disease.

Adolescent↗
PubMed1987

[Distribution of Langerhans cells in spinocellular epitheliomas].

The authors perform and study about Langerhans cell's distribution on squamous cell carcinomas and on one ecrine porocarcinoma. We used OKT6 and HLA-Dr antigens with fluorescein. We observed a higher density of these cells on the tumors more differentiated. On the other hand, we have seen that tumoral cells of the ecrine porocarcinoma display HLA-Dr antigens.

Adenoma, Sweat Gland↗
PubMed1986

Prophylactic tocainide or lidocaine in acute myocardial infarction.

Twenty-nine patients with acute myocardial infarction (AMI) were studied in a randomized double-blind trial of intravenous lidocaine and tocainide, followed by either oral tocainide or placebo without regard to previous therapy, for the prophylaxis of arrhythmias associated with acute infarction. No patient had symptomatic ventricular tachycardia or fibrillation, although 1 patient taking lidocaine was withdrawn from therapy because of breakthrough arrhythmias. One patient in each group died from mechanical complications of AMI. Tocainide was administered to 16 patients and lidocaine to 13. Seven of the 13 patients receiving lidocaine had ventricular tachycardia or accelerated idioventricular rhythm, compared with 2 of 16 receiving tocainide (p less than 0.05). Adverse effects were noted in 11 of the 13 patients receiving lidocaine and 6 of the 16 patients receiving tocainide. The infusions used provided therapeutic levels of lidocaine or tocainide and the transition to oral tocainide was accomplished safely with maintenance of therapeutic antiarrhythmic levels. Thus, tocainide appears to be at least as efficacious and may be safer than lidocaine for the prophylaxis of ventricular arrhythmias associated with AMI. The transition to oral tocainide is well tolerated and can be accomplished with minimal difficulty.

Administration, Oral↗