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Biomedical subjects

J M Howat

Publications and source records attributed to J M Howat.

6 recordsLinked to original sources
PubMed1979

Inhibition of antibody-dependent cellular cytotoxicity by artificial immune complexes and pathological sera.

Detection of immune complexes by inhibition of antibody-dependent cellular cytotoxicity (ADCC) is based on the principle that soluble complexes can compete with target cell-bound antibody for receptors (FcR) on cytotoxic lymphocytes. The objective of this study was to define a cytotoxicity system for the determination of soluble immune complexes in the sera of patients with inflammatory bowel disease (IBD). For this purpose, the conditions under which soluble complexes of rat serum albumin (RSA) and rabbit anti-RSA inhibited human K-cell mediated lysis of sensitized Chang cells were examined, on the assumption that the behaviour in the system of circulating immune complexes putatively present in inflammatory bowel disease, is similar to that of artificial immune complexes. Inhibition of ADCC by a standard amount of artificial complex in different normal human sera was relatively uniform provided that the final concentration of the latter did not exceed 10% of the culture medium. In the absence of extraneous complexes, the effect of both normal and IBD sera on ADCC varied widely. Differential inhibition of ADCC by sera from patients with IBD and normal subjects was thus expressed as a function of ADCC in a standard batch of foetal bovine serum (FBS). Under these conditions differences between pathological (n = 51) and normal (n = 52) sera were highly significant (P less than 0.001), which could not be explained by the presence in the patients' sera of HL-A antibodies reactive with the effector cells, nor by a deficit in nutritional support of ADCC. The absence of a correlation between inhibition of ADCC and total serum IgG or IgM inferred that inhibition was attributable to immune complexes in the IBD sera. The limitations of this assay for assessment of the incidence of immune complexes in pathological sera are discussed.

Adult↗
PubMed1978

Benign duodenocolic fistula.

Benign duodencolic fistula is a rare complication of a number of gastrointestinal diseases and it is seldom considered in diagnosis. Diarrhoea and weight loss are characteristic presenting features which may be masked by coexisting disease. Barium enema is the most useful diagnostic procedure. Prognosis is good if surgery is undertaken at an early stage after adequate correction of the metabolic consequences of the fistula, by administration of fluid, electrolytes and parenteral nutrition. This paper reports 4 cases of this condition and reviews the clinical features, investigation, aetiology and management.

Adult↗
PubMed1975

A day-surgery programme for children incorporating anaesthetic outpatient clinic.

A day-surgery programme for children incorporating an outpatient anaesthetic assessment clinic was welcomed by parents and general practitioners and resulted in better deployment of hospital resources. It is suggested that the difficulties usually associated with day-case surgery can be reduced by holding an outpatient assessment clinic a few days before operation.

Anesthesia, Inhalation↗