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Biomedical subjects

D H Bevan

Publications and source records attributed to D H Bevan.

52 records · Page 3Linked to original sources
PubMed1991

Decreased expression of complement receptor type 2 (CR2) on neoplastic B cells of chronic lymphocytic leukaemia.

Neoplastic cells from 49 patients with B cell chronic lymphocytic leukaemia (B-CLL) were studied and compared with normal peripheral and tonsillar B cells using CD21 monoclonal antibodies. Membrane expression of CR2 was quantified by calibrated flow cytometry and by binding analysis with radiolabelled antibody. Both assays indicate that B-CLL cells express only 30% of the CR2 found on normal B cells. These findings are further evidence of the aberrant phenotype of B-CLL cells.

Antibodies, Monoclonal↗
PubMed1990

The Kasabach-Merritt syndrome: treatment with intermittent pneumatic compression.

A 6 week old infant presented with a giant angiomatous naevus of the leg complicated by chronic disseminated intravascular coagulation. The bleeding and laboratory abnormalities responded to intermittent pneumatic compression of the affected limb. This innocuous treatment should be considered in the Kasabach-Merritt syndrome.

Air↗
PubMed1987

Serial studies of T-lymphocyte subpopulations in HIV seropositive haemophiliacs.

Serial determinations of the numbers of peripheral blood T-lymphocyte subpopulations (T-helper/inducer and T-suppressor/cytotoxic cells) were made using monoclonal antibodies in 12 patients with haemophilia who were HIV antibody positive. Eleven patients were clinically severe and one clinically moderate. Follow-up studies for 12-42 months in nine patients showed persisting abnormalities in five patients, abnormalities which developed in three patients who were initially normal, and a return to normal findings in one patient who was initially abnormal. The remaining three patients were followed up for 3-4 months; two showed persisting abnormalities and one a return to normal. Persistent generalized lymphadenopathy was found in one patient who showed raised levels of T-suppressor cells initially and low levels of T-helper cells in the follow-up, but low T-helper cells persisting for up to 12 months were not necessarily associated with disease.

Antibodies, Monoclonal↗
PubMed1986

Effects of arginine vasopressin (AVP) infusions on circulating concentrations of platelet AVP, factor VIII: C and von Willebrand factor.

To study the possible role of arginine vasopressin (AVP) in the control of haemostasis AVP infusions at 3 doses (0.1, 0.2 and 0.3 mU/kg/min) were performed in 6 male volunteers. Both plasma and platelet AVP concentrations rose in a dose-related manner. At doses of 0.2 and 0.3 mU/kg/min there was an increase in the plasma concentrations of both plasma Factor VIII and von Willebrand factor. The data support the hypothesis that AVP, by interacting with platelets and stimulating factor VIII and von Willebrand factor release, plays a role in the control of haemostasis.

Adult↗
PubMed1986

Human platelet arginine vasopressin.

Approximately 90% of arginine vasopressin circulating in blood is associated with the platelets. Studies in six patients with cranial diabetes insipidus indicate that the platelet vasopressin originates in the hypothalamus and is taken up from plasma. Extracted platelet vasopressin is chromatographically identical to the posterior pituitary peptide and biologically active. Infusion of low-doses of exogenous vasopressin into 10 normal male subjects caused a marked rise in both plasma and platelet hormone concentrations. Stimulation of endogenous vasopressin release by hypertonic saline (0.51 mol/l) infusion for 135 min in five male subjects also caused a rise in platelet and plasma peptide concentrations. In seven male smokers, the deep inhalation of two consecutively smoked unfiltered cigarettes caused a significant rise in both platelet and plasma vasopressin. Baseline platelet vasopressin concentrations in the smokers were higher than in the non-smoking males even after 10 hours abstinence.

Adult↗
PubMed1985

Malignant histiocytosis of the intestine: a T-cell lymphoma.

Malignant lymphoma complicating coeliac disease has been characterised on morphological and immunocytochemical grounds as malignant histiocytosis of the intestine (MHI). Fresh tissue from four cases of MHI was studied by means of a panel of monoclonal antibodies; in three cases tumour DNA was studied for immunoglobulin and T-cell receptor (TCR) gene rearrangement. Immunocytochemistry showed a T-cell phenotype in all four cases, confirmed by the demonstration of a rearranged TCR beta-chain gene in the three cases studied. Lymphoma complicating coeliac disease thus appears to be of T-cell, rather than histiocyte, origin.

Adult↗
PubMedDate not supplied

Red cell exchange, erythrocytapheresis, in the treatment of malaria with high parasitaemia in returning travellers.

In severe falciparum malaria with high parasitaemia, removal of parasitized erythrocytes is generally considered to be of value as adjunctive therapy in addition to standard chemotherapy. Such removal is commonly achieved by exchange transfusion but this procedure is time-consuming and may be associated with haemodynamic disturbance. Current-generation automated cell-separator hardware and software allows prompt red cell exchange, erythrocytapheresis, in a single continuous-flow isovolaemic procedure. We describe the application of this procedure to 5 cases of severe falciparum malaria in travellers returning to the UK from the tropics. All patients also received quinine and conventional supportive therapy. In all cases, dramatic reduction in parasitaemia was achieved within 2 h with subsequent complete clinical recovery. Erythrocytapheresis has significant advantages over exchange transfusion in terms of speed, efficiency, haemodynamic stability and retention of plasma components such as clotting factors and may thus represent an improvement in adjunctive therapy for severe malaria.

Adolescent↗
PubMedDate not supplied

Circulating villous lymphocytes--a link between hyperreactive malarial splenomegaly and splenic lymphoma.

Significant numbers of villous lymphocytes were noted in the blood of patients with a clinical diagnosis of hyperreactive malarial splenomegaly (HMS) in Ghana. Demographic and haematological data were recorded from 22 patients with massive splenomegaly. Additional investigations included lymphocyte immunophenotyping, protein electrophoresis and immunoglobulin gene rearrangements. Although all patients had over 30% villous lymphocytes and no leucocytosis, 7 had no evidence of a monoclonal disorder. Immunophenotyping and the presence of monoclonal lymphocytes identified 3 further patients with B-cell splenic lymphoma with villous lymphocytes (B-SLVL). HMS and SLVL co-existed in the same, predominantly female, patient population and were indistinguishable except by molecular analysis of lymphocytes. The discovery of the uncommon villous lymphocytes in both non-malignant and malignant disorders in the same geographical area suggested that HMS and SLVL are pathophysiologically related. In Caucasians with SLVL the malignant cells arise from B-cells that have undergone antigen selection. We postulate that the excessive proliferation of polyclonal B-lymphocytes, driven by frequent exposure to malaria, predisposes to the emergence of a malignant lymphoma, B-SLVL, in tropical West Africa.

Adult↗