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Biomedical subjects

R Wilkinson

Publications and source records attributed to R Wilkinson.

At least 217 records · Page 12Linked to original sources
PubMed1988

Hypertension and diabetes mellitus: erythrocyte electrolytes and the effect of captopril treatment.

Erythrocyte sodium, potassium and water contents and sodium fluxes were measured in both normotensive and hypertensive patients with either insulin dependent or non-insulin dependent diabetes mellitus. Hypertensive patients were studied again after two months' treatment with captopril. There were no differences in erythrocyte ion contents or concentrations but sodium fluxes may have been lower in insulin dependent patients and in hypertensive patients. The most marked erythrocyte defects associated with hypertension were low erythrocyte water content and increased potassium concentration in non-insulin dependent diabetic patients. Treatment with captopril caused an increase in erythrocyte water and a decrease in ion content and concentration. In non-insulin dependent diabetic patients, who had the greatest increases in erythrocyte water and falls in potassium concentration, frusemide-sensitive sodium-potassium co-transport activity was reduced. The reduction in blood pressure with captopril treatment was related to the initial erythrocyte sodium content.

Biological Transport↗
PubMed1988

Specific and nonspecific imaging of localized Fisher immunotype 1 Pseudomonas aeruginosa infection with radiolabeled monoclonal antibody.

To determine if radiolabeled specific antibodies directed against bacterial antigens could be used to detect sites of infection, gamma camera imaging studies were performed in animals infected with Pseudomonas aeruginosa. Murine monoclonal antibodies (Mabs) directed against Fisher Immunotype 1 Pseudomonas aeruginosa and a nonmicrobial, nonmammalian haptene, p-arsanilic acid, were labeled with 125I by the lodogen-Bead method. Unilateral, deep thigh infections were created by innoculation with 2 X 10(8) Fisher Immunotype 1 P. aeruginosa. Twenty-four hours later, one of the radiolabeled antibodies was injected intravenously at a dose of 0.25 mg/kg (100-150 microCi). Serial gamma imaging was then carried out beginning at 4 hr and at approximately 24-hr intervals thereafter. Beginning as early as 4 hr postinjection, the area of inflammation could be visualized with either the specific or nonspecific Mab, with the images continuing to intensify until 24-48 hr postinjection. At 48 hr, the contrast between lesion and background with the nonspecific Mab began to fade, while the contrast in the specific Mab-generated images continued to intensify until approximately 192 hr postinjection. Clear-cut differentiation between specific and nonspecific Mab-generated images was possible by 72 hr postinjection. We conclude that specific immune imaging of localized infection with Mab's directed against specific microbial antigens is possible and should be clinically useful. In addition, images created by the localization of immunoglobulin non-specifically at the site of inflammation in the first 24-48 hr postinjection may also provide useful information as to the anatomic location of hidden abscesses.

Animals↗
PubMed1988

An evaluation of technetium-99m tin colloid--its value in the diagnosis of renal transplant rejection.

The value of the Technetium-99m tin colloid (TTC) scan in the diagnosis of renal transplant rejection occurring more than 1 month following transplantation was assessed. To our knowledge, use of this agent has not previously been reported. Gamma camera imaging was performed on 15 occasions in 14 patients in whom plasma creatinine was rising and in three patients in whom renal function was stable. Both a qualitative and a quantitative assessment of images was made. The radioactivity recorded over the graft at 12-16 min post injection was expressed as a percentage of that recorded at 0-4 min. In the nine patients in whom graft perfusion was adequate to allow interpretation of the TTC scan and in whom rejection was diagnosed by biopsy (six cases) or on clinical grounds (three cases), the index ranged from 45 to 153%. In two patients the graft was poorly perfused and the accumulation of TTC was predictably low despite the presence of rejection. In the seven patients with either a stable creatinine or with rising creatinine not due to rejection, the index ranged from 5 to 43%. Previously reported studies have shown that sulphur colloids may be of value in diagnosing graft rejection. This study suggests that Tc99m tin colloid may be regarded as a suitable alternative scanning agent and that some simplification of data collection and analysis can be achieved.

Colloids↗
PubMed1988

End-stage renal failure due to multiple myeloma--poor survival on peritoneal dialysis.

This report describes five subjects with end-stage renal failure due to multiple myeloma. All of the patients died within seven months of commencing chronic peritoneal dialysis. Complications were frequent during the dialysis period. Our experience supports the opinion that patients with multiple myeloma and a high tumour cell mass should not be offered dialysis.

Aged↗