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Biomedical subjects

A R Wilson

Publications and source records attributed to A R Wilson.

At least 73 records · Page 4Linked to original sources
PubMed1987

Delayed traumatic arteriovenous fistula following hemodialysis vascular catheterization.

Arteriovenous fistula formation is a rare complication of percutaneous femoral vein cannulation for hemodialysis. Symptoms and physical findings may be elusive and the lesion can proceed unnoticed for extended periods of time. This complication is easily managed with surgical repair following rapid clinical and angiographic diagnosis. It is the purpose of this paper to report a case of delayed arteriovenous fistula formation 7 months following percutaneous insertion of an acute hemodialysis catheter into the femoral vein.

Arteriovenous Fistula↗
PubMed1984

The Diagnostic Imaging Information Center.

The authors have developed a Diagnostic Radiology Imaging Information Center, in which the physician can see at a glance, with minimum expenditure of time and maximum emphasis on relevance, a summary of the patient's studies and procedures done in the x-ray department.

Forms and Records Control↗
PubMed1982

Real-time two-dimensional echocardiography in differentiating vascular from nonvascular mediastinal lesions.

We evaluated the ability of two-dimensional echocardiography to differentiate vascular from nonvascular causes of radiologic mediastinal masses or widening. In 22 patients with a radiologic mass, two-dimensional echo detected a mass in 11 patients, an aortic aneurysm in four patients, left ventricular pseudoaneurysm in four patients, and marked pulmonary artery dilatation in three patients. In 36 patients with mediastinal widening, two-dimensional echocardiography detected an aneurysm in 28 and a mass in four patients; it was normal in four patients. Two-dimensional echocardiography can differentiate vascular from nonvascular radiologic mediastinal abnormalities.

Aortic Aneurysm↗
PubMed1981

Two dimensional echocardiographic diagnosis of aortic dissection.

The usefulness of two dimensional echocardiography in establishing the diagnosis of aortic dissection was evaluated. Forty-two patients were referred for study; 15 had a dissection and 27 did not. Two dimensional echocardiography detected the intimal flap in 12 of 15 patients with a dissection, the three false negative studies were in patients with a localized dissection. There was one false positive study in the 27 patients who did not have a dissection.

Aortic Dissection↗
PubMed1981

Dissecting aortic aneurysm associated with a midsystolic click.

A midsystolic click occurred in a patient with a type 1 dissecting aneurysm. The mechanism of production of the systolic click may be related to rapid deceleration of blood against the intimal flap. Combined phonocardiography and echocardiography (using a new second right intercostal space approach) proved to be helpful in differentiating this sound from an aortic and pulmonary ejection click. In addition, other causes of midsystolic clicks, such as mitral and tricuspid valve prolapse, were excluded.

Aged↗
PubMed1980

Field trials of a method of induction of autoimmune gonad rejection in Atlantic salmon (salmon salar L.).

Autoimmune gonad destruction was induced in Atlantic salmon of both sexes in trials carried out on fish kept in sea cages on a fish farm. Damage to gonads was only found in fish where the first injection of gonad extract had been given together with Complete Freund's Adjuvant, injections without adjuvant or with carrageenan as an adjuvant were unsuccessful. Length and weight differences between treated and untreated groups of fish were slight at the termination of the experiment. Results suggest that practical application of this technique would involve injection at an early stage of gonad development and at a higher water temperature (greater than 10 degrees C) to increase the rate of the primary autoimmune response. The lesion induced in the salmon testis was compared with that caused by autoimmune destruction of mammalian testis.

Animals↗
PubMed1979

Role of bovine serum albumin in the nutrition of Mycobacterium tuberculosis.

Bovine serum albumin promotes the growth of small inocula of Mycobacterium tuberculosis in media containing unesterified fatty acids. Albumin binds fatty acids present in concentrations toxic for the organisms. In the present study, additional roles of albumin were investigated. When present in a basal medium, fatty acid-free albumin could be utilized by M. tuberculosis as a sole source of carbon. Since albumin could not substitute for the amino acids in basal medium as a nitrogen source, it was concluded that the protein component in albumin was not utilized as a nutrient by the organisms. An ether extract of fatty acid-free albumin supported a small but significant amount of growth. Analysis of the lipids in fatty acid-free albumin by gas chromatography revealed the presence of 686 microgram of fatty acid per g of albumin. Although a small amount of growth occurred when a lipid extract of albumin was present in the medium, growth stimulation was dependent in major part on the presence of undenatured albumin in the medium. Lipids, when bound to albumin, can serve as a nontoxic source of carbon and energy.

Culture Media↗
PubMed1978

A new method for the simultaneous assay of rosette-forming and antibody-secreting cells, utilising immune adhesion reactions in monolayer.

Mixtures of sheep erythrocytes and immune spleen cells from mice were incubated in shallow slide chambers coated with erythrocyte ghosts or anti-mouse Ig, with poly L-lysine as a coupling agent. Antigen-binding cells and erythrocytes surrounding antibody-releasing lymphocytes became bound to the reactive surfaces by immunocytoagglutination and could be readily observed on inversion of the chambers. The sensitivity of the method compares with those currently in use for quantification of antibody-releasing cells, and resolution of rosettes is markedly superior to that obtainable in other assay systems. The advantages and limitations of the method are discussed.

Animals↗
PubMed1976

Cardiopulmonary changes during flexible fiberoptic bronchoscopy.

Changes of pulse rate and arterial blood gases were measured before, during, and after fiberoptic bronchoscopy in eleven patients with resting arterial PO2 breathing room air of 75 mm Hg or greater. Tachycardia was greatest after anesthesia (mean change greater than 20 beats/min) and declined thereafter. Hypoxemia was progressive from the time of entrance of the bronchoscope into the respiratory tree and continued into the immediate postbronchoscopic period when the mean fall was about 16 mm Hg. Mild hyperventilation was noted under all conditions. Since progressive hypoxemia persists following removal of the instrument and does not occur during rigid bronchoscopy, direct irritation causing reflex bronchospasm and the effects of aspirated secretions, anesthetic or lavage must be considered as possible causes for the hypoxemia.

Adult↗
PubMed1976

Evaluation of carrageenan as an immunosuppressive agent and mediator of intravascular coagulation.

Carrageenan suppressed antibody responses to SRBC in mice and rats, measured in terms of splenic IgM PFC production. The effect, in mice, was dependent on dose and on the temporal relationship between treatment and antigen administration. Carrageenan was found to alter the time course of the PFC response and also to produce disseminated intravascular coagulation. Some correlation between the observed effects and the use of chemically distinct carrageenans was found. The possible mode of action of carrageenan is discussed in the light of these, and other findings.

Animals↗