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Biomedical subjects

C Quereda

Publications and source records attributed to C Quereda.

At least 19 recordsLinked to original sources
PubMed1995

[Demyelinating polyradiculitis in neuro borreliosis].

Demyelinating neuropathy is considered a rare complication of Lyme borreliosis. We report a case of meningoradiculitis due to Borrelia burgdorferi in which the neurophysiological analysis showed evidence of restricted demyelinating involvement of the nerve roots and plexus, with no peripheral involvement or signs of distal axonal lesions. Lyme disease, therefore, can in fact be associated with demyelinating polyradiculitis with no peripheral nerve damage.

Aged↗
PubMed1993

Hepatitis C antibody after kidney transplantation: clinical significance.

The prevalence of antibodies to hepatitis C virus (HCV) was investigated in 231 renal transplantation recipients, by a first- and second-generation EIA assay and a second-generation immunoblot assay (4-RIBA). Before transplantation, prevalence of anti-HCV was 22.6% and was related to the time on dialysis (p < 0.01), transfusions (p < 0.01) and previous history of chronic liver disease (p < 0.01. Following transplantation, 32 patients (13.9%) were anti-HCV positive by the first-generation enzyme immunoassay (EIA) and it increased to 57 patients (24.7%) when anti-HCV was measured by the second-generation EIA. The 4-RIBA assay confirmed the positivity in 46 patients (80.7%), 11 patients (19.3%) were indeterminate. Seroconversion after grafting was observed in 7 negative patients, and another 7 patients became negative after the procedure. The presence of anti-HCV antibody after transplantation was determined by the patient status on dialysis, 80% of them being positive before surgery. Twenty-one 4-RIBA-positive transplantation patients (45.7%) had persistently or intermittently abnormalities on liver function tests, suggesting chronic liver disease. A liver biopsy performed on 10 of these patients showed; chronic active hepatitis in 6, chronic persistent hepatitis in 2, and chronic lobular hepatitis in the other 2 patients. Another 23 4-RIBA-positive transplantation patients had normal alanine aminotransferase levels despite long follow-up (66.2 +/- 32.2 months). The prevalence of anti-HCV antibody can be underestimated if the antibody is measured by first-generation EIA alone. About 50% of patients with anti-HCV had chronic liver disease, and the histological findings suggested a possible evolution to cirrhosis.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1992

Stroke in adult polycystic kidney disease.

In order to assess the incidence of acute cerebrovascular events, 142 patients with adult polycystic kidney disease were retrospectively reviewed. Fourteen patients (9.8%) had 19 cerebral attacks. Six patients (4.2%) had intracranial haemorrhage attacks (three ruptured intracranial aneurysms and three cerebral haemorrhages). Ischaemic events occurred in nine patients (five cerebral infarctions and four transient ischaemic attacks). Patients with ischaemic attacks had a better outcome than patients with haemorrhagic events even when transient ischaemic attacks were excluded. Patients with ruptured intracranial aneurysms were younger. Cerebral complications are an important cause of morbidity and mortality in patients with adult polycystic kidney disease. They can prove disabling prior to or after dialysis and transplantation.

Acute Disease↗
PubMed1992

In situ demonstration of Epstein-Barr virus in intravenous drug abusers with generalized lymphadenopathy.

We have studied by the in situ hybridization method the presence of Epstein-Barr virus (EBV) DNA genome in lymph node tissues from 11 patients with persistent generalized lymphadenopathy. Using a biotinylated EBV DNA probe, we demonstrated EBV nucleic acid in scattered germinal centre cells in eight of the 11 cases. Our results suggest that EBV is not a determinant factor in the pathogenesis of this lymphadenopathy, but support its possible implication in B cell malignant transformation in cases of AIDS-associated lymphoma.

AIDS-Related Complex↗
PubMed1992

Hemodynamic changes in the dog connected to a dialysis circuit: influence of the body temperature.

Eighteen sessions in 9 mongrel dogs were carried out to know the hemodynamic effects produced by body temperature variation, when blood passes through a dialysis circuit with a Cuprophan dialyzer, without dialysate contact. The decrease of 2 degrees C in body temperature caused a decrease in heart rate and cardiac index (-8.6 and -17.6%, respectively) without significant changes in blood pressure. The increase of 2 degrees C in body temperature increased the heart rate, the cardiac index and the first derivative of ventricular pressure (+14.8, +17.3 and +27.8%, respectively) with a decrease of 13.6% in the systemic vascular resistance. Blood pressure did not change significantly. We conclude that the dog maintains the hemodynamic stability by two different mechanisms: when body temperature rises, by increasing the cardiac index; when body temperature decreases, by increasing the systemic vascular resistance.

Animals↗