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Biomedical subjects

J Main

Publications and source records attributed to J Main.

At least 91 records · Page 5Linked to original sources
PubMed1992

Antigenic heterogeneity of strains of Saccharomyces cerevisiae and Candida albicans recognised by serum antibodies from patients with Crohn's disease.

The antigenic heterogeneity of twelve strains of Saccharomyces cerevisiae and serovar A and B strains of Candida albicans was investigated by cross-absorption of serum antibodies from a patient with Crohn's disease. On the basis of common antibody absorption patterns, eleven of the yeast strains were divided into Group 1 (five S. cerevisiae), Group 2 (two C. albicans, one S. cerevisiae) and Group 3 (three S. cerevisiae). The remaining three S. cerevisiae strains (Group 4) showed unique absorption patterns. The antigenic relationship between S. cerevisiae and C. albicans was further studied by cross-absorption of sera from eight patients with Crohn's disease. This confirmed a limited degree of cross-reaction between most strains of S. cerevisiae and C. albicans, but C. albicans serovar B significantly absorbed antibodies to more S. cerevisiae strains than did C. albicans serovar A. The results demonstrate considerable antigenic heterogeneity of S. cerevisiae and suggest that the elevated serum antibody levels to S. cerevisiae found in Crohn's disease are directed against multiple antigens.

Antibodies, Fungal↗
PubMed1992

Severe haemolysis and renal failure in a patient with paroxysmal nocturnal haemoglobinuria.

Transfusion of about 60 ml of ABO incompatible plasma in 4 units of pooled platelets precipitated severe haemolysis, unmasking the emergence of paroxysmal nocturnal haemoglobinuria (PNH), in a patient with aplastic anaemia. In vitro tests showed that her red cells were lysed by both ABO compatible and incompatible plasma from normal donors. The behaviour of this case and the in vitro results suggest that it might be hazardous to relax the longstanding recommendation on transfusing patients with PNH by restricting the washing of blood components to those containing ABO incompatible plasma.

ABO Blood-Group System↗
PubMed1992

Monospot and VP1 tests in chronic fatigue syndrome and major depression.

Thirty-four patients with chronic fatigue syndrome (CFS) were compared with controls with DSM-III-R major depression on the Monospot and VP1 antigen tests. There was no significant difference in the numbers initially VP1 positive in the groups (11/34 and 7/34 positive in the chronic fatigue and major depression group respectively). Four CFS but no depressed patients were Monospot positive initially. No patient was both Monospot and VP1 positive. Patients positive on the tests were offered a repeat 6 months later. Eight of the 11 VP1 positive patients in the CFS group were retested and four remained positive, but none of the four depressed patients retested remained positive. No patient retested remained Monospot positive. The Monospot and VP1 tests appear to have little discriminating ability between these groups as screening tests and their predictive validity is unclear.

Adult↗
PubMed1991

The battle over benefits.

Squeezed in a tight economy, companies are looking for savings where once they didn't dare: in health insurance and pension costs. Employees get panicky at the thought.

Aged↗
PubMed1991

Cytomegalovirus infection in AIDS. Patterns of disease, response to therapy and trends in survival.

Among 347 AIDS patients seen at St Mary's Hospital, London between 1983 and 1989, cytomegalovirus (CMV) disease was observed in 75 (22%). Of these, 58 (77%) had CMV retinitis, 26 (35%) CMV colitis, and 12 (16%) had CMV infection diagnosed at other sites. Relapse occurred in 71%. A favourable response to the use of ganciclovir as induction therapy for CMV retinitis was observed in 92%. Relapse of CMV retinitis occurred in 54% at a median time of 97 days. Neutropenia was the most frequent and serious side-effect of ganciclovir, 76% patients having neutrophil counts less than 1.0 x 10(9)/l and 48% less than 0.5 x 10(9)/l at some stage of therapy. Thrombocytopenia was also common, and platelet counts of less than 50 x 10(9)/l occurred in 43% patients on ganciclovir. The concurrent use of zidovudine made the development of severe neutropenia and thrombocytopenia more likely. Median survival following the diagnosis of CMV disease increased from 5-8 months between 1984 and 1987, to over 12 months in 1988. Patients with CMV colitis had a worse prognosis than patients with CMV retinitis, with median survival of 4.5 and 7 months respectively. In conclusion, CMV is an important opportunist infection in AIDS and both the disease and its treatment cause considerable morbidity. Hence, it is important to develop more effective and less toxic forms of therapy for CMV infection.

Acquired Immunodeficiency Syndrome↗
PubMed1991

Therapy of chronic viral hepatitis.

Chronic infection with hepatitis B virus (HBV), the delta agent (HDV) or hepatitis C virus (HCV) carries high risks of chronic liver disease which can result in cirrhosis and hepatocellular carcinoma. Many antiviral agents have been tried to inhibit viral replication and thereby limit infectivity and the risks of eventual serious liver disease. Interferon offers a 30-40% chance of viral clearance to the hepatitis B carrier, offers a good chance of clinical response in parenterally acquired chronic non-A non-B hepatitis and may be of benefit for some patients with chronic delta infection.

Antiviral Agents↗
PubMed1991

Haemodialysis: effects on white and red blood cell sodium content and transport.

A circulating sodium pump inhibitor, released in response to volume expansion, may, by increasing intracellular sodium concentrations, be responsible for some of the features of the uraemic state. Haemodialysis, by correcting volume overload, would be expected to be associated with a decrease in intracellular sodium towards normal. The effects of a haemodialysis session on leukocyte (WBC) sodium content and transport have not been described and there are conflicting reports of the effects of haemodialysis on erythrocyte (RBC) sodium content and transport. We have measured sodium (NaWBC/RBC) and potassium content (KWBC/RBC), net ouabain-sensitive sodium flux rate (FR) and sodium flux rate constant (RC) before and after a standard haemodialysis session in 20 stable hospital haemodialysis patients. In leukocytes (n = 18), sodium (P = 0.078), FR (P = 0.006), and RC (P = 0.071) decreased over dialysis, whereas in erythrocytes sodium increased (P less than 0.001, n = 19) and RC declined (P = 0.002, n = 18). Although in opposite directions in RBC and WBC, the changes in sodium were toward normal in both cell types. Changes in intracellular sodium content and transport did not correlate with changes in measures of ECF volume or biochemical efficiency of dialysis. We conclude that haemodialysis does affect cell sodium content and transport, but in different ways in different cell types. There was no evidence that haemodialysis removed a sodium pump inhibitor. The use of RBC or WBC as 'model' cells to study sodium transport in uraemia is of questionable validity.

Adult↗
PubMed1991

Disseminated strongyloidiasis in AIDS: uncommon but important.

Disseminated Strongyloides stercoralis infection is a rare and severe but treatable complication of AIDS. We present a case where this infection was successfully treated and review the available literature. Cases may present many years after they have left an area endemic for Strongyloides infection, emphasizing the need for a full travel history. Symptoms are typically gastrointestinal and pulmonary, with infiltrates often seen on chest radiography. Diagnosis requires stool examination and biopsy of affected sites. Treatment with repeated courses of thiabendazole (25 mg/kg twice daily for 5 days) was successful in our case, but maintenance regimens have not yet been defined. The relative rarity of this complication of AIDS suggests that, where both infections are present, disseminated strongyloidiasis only arises either when HIV-induced immunodeficiency is profound or, possibly, when it is accompanied by impaired granulopoiesis.

Acquired Immunodeficiency Syndrome↗
PubMed1991

Successful haemodialysis via an unusually sited subclavian catheter.

A 38-year old woman with a history of congenital rubella required temporary venous access for haemodialysis. A left sided subclavian catheter was inserted percutaneously and on check radiography it was found to be on the left side of the mediastinum. Contrast radiography showed that the catheter was in a left sided superior vena cava which drained into the right atrium via the coronary sinus. Haemodialysis was performed without any difficulty.

Adult↗
PubMed1990

Immunization of woodchucks with recombinant hepatitis delta antigen does not protect against hepatitis delta virus infection.

To assess the role of immunization against hepatitis delta antigen in the prevention of hepatitis delta virus infection, woodchuck carriers of woodchuck hepatitis virus were immunized with a 64 amino acid portion of hepatitis delta antigen from its N-terminal region. The protein was expressed in Escherichia coli and contained a major immunogenic epitope. A significant anti-hepatitis delta response was observed that did not, however, protect the animals from hepatitis delta virus superinfection. Unexpectedly, the period of detectable viremia was longer in the immunized than in the control animals. We conclude that immunization with this recombinant hepatitis delta antigen does not afford protection against subsequent hepatitis delta virus exposure.

Animals↗
PubMed1990

Ethanol predominantly alters sodium influx in human leucocytes.

1. Although ethanol appears to alter cellular sodium transport, the exact nature of its effects has not been clearly defined. We have studied the effects of different concentrations of ethanol on human leucocyte sodium content, and on the rise in leucocyte sodium content which occurs during sodium pump blockade with ouabain. 2. Sodium content was significantly reduced after a 20 min incubation with ethanol at concentrations between 17 and 170 mmol/l. 3. The rise in sodium content during a 20 min incubation with ouabain was significantly less in the presence of 170 mmol/l ethanol as compared with 17 mmol/l ethanol. 4. These results suggest that the effect of ethanol on intracellular sodium content is independent of sodium pump activity, i.e. it is mediated through reduced sodium influx.

Biological Transport↗