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Biomedical subjects

R B Dawson

Publications and source records attributed to R B Dawson.

At least 19 recordsLinked to original sources
PubMed1992

Hemapheresis in pregnancy.

Plasma exchange in pregnancy has benefited those diseases that occur and are treated in the nonpregnant patient. In addition, special emphasis was given to diseases unique to pregnancy, such as hemolytic disease of the newborn, which is significantly modified by plasma exchange therapy. Fluid volumes, replacement solution, and techniques were discussed.

Blood Component Removal↗
PubMed1983

Efficacy of hetastarch in the resuscitation of patients with multisystem trauma and shock.

A prospective trial of 6% hetastarch (HES) v 5% plasma protein fraction (PPF) as the colloid component of intravenous (IV) fluid resuscitation was conducted in 32 patients with multisystem trauma and/or hemorrhagic shock. Patient age, mechanism and pattern of injury, and IV fluid requirements were similar in both groups. No intergroup differences were noted in indexes of hepatic, pulmonary, or renal function or in the incidence of infection. The frequency of other complications, including bleeding diatheses, and mortality were identical in the two groups. Although this investigation should be viewed as a pilot study, our results suggest that, compared with PPF, HES in large volumes is a safe, effective colloid solution in the resuscitation of patients with multisystem trauma and/or hemorrhagic shock. Further study of HES in a larger number of patients is warranted by these findings.

Adolescent↗
PubMed1979

Autotransfusions.

Explore the source record for details and available documents.

Blood Transfusion, Autologous↗
PubMed1979

The significance of 2,3-DPG in red blood cell transfusions.

This review will begin by giving the highlights of the history and explain development of the basic science knowledge of hemoglobin chemistry, function, and physiology. The necessary involvement of red cell metabolism, as it pertains to the maintenance of 2,3-diphosphoglycerate (2,3-DPG) levels, both normally and under the perturbed and experimental conditions of blood storage, will be given as part of the basic science data. The clinical science and transfusion data will comprise the main critical aspects of the paper. Analysis and comment of over 20 studies will be given on the effects of animal and human transfusions with altered 2,3-DPG levels. Decreased survival and organ function have been demonstrated with transfusion of low 2,3-DPG red cells, with or without anemia, in the conditions of exercise, shock, hypotension, ischemia, cardiac surgery, hypoxia, sepsis, and acidosis. By critical analysis of these studies, recommendations on general and specific patient needs for red cell transfusions with normal or high 2,3-DPG levels are given.

Adult↗
PubMed1978

Preservation of erythrocytes using metabolic regulators and mutrients. V. Inosine and methylene blue.

Methylene blue and inosine have been shown to stimulate glycolytic metabolism in the erythrocytes, increasing the concentration of 2.3-diphosphoglycerate (2,3-DPG), which is necessary for hemoglobin function, by regulating oxidative metabolism and providing a five-carbon nutrient for glycolysis, respectively. However, a recent study suggested that the methylene blue effect was dependent on the presence of inosine. This study was designed to establish, if possible, the existence of a methylene blue effect and to confirm the usefulness of inosine. The optimal concentration of inosine for increasing 2,3-DPG synthesis in a CPD-adenine preservative is confirmed to be 10--15 mM. Concentrations of 2,3-DPG were maintained in the erythrocytes at normal or higher levels for 21 days of storage with 10 or 15 mM inosine, whether the methylene blue was present or not. However, when methylene blue was present, 2,3-DPG concentrations were significantly better maintained.

Adenine↗
PubMed1976

Hemoglobin function in stored blood, XVII. Maintenance of red cell 2,3 DPG (function) and ATP (viability) for six weeks in ACD or CPD-adenine-inosine-methylene blue.

Blood preservatives containing adenine for six week storage have been prepared with inosine and methylene blue at various pH levels in order to maintain, 23-DPG levels for immediate oxygen transport upon transfusion. In one experiment, the adverse effect of a high pH on ATP maintenance was demonstrated in the presence of methylene blue and inosine. In this and other experiments it was clear that ATP was better maintained in low pH preservatives and DPG better maintained in higher pH preservatives. However, 2,3-DPG levels were kept from falling with CPD-adenine-inosine over a wide range of pH values. A CPD-adenine-inosine preservative at a pH 5.8 maintained normal DPG levels for three weeks of storage. A similar preservative but with a pH of 6.6 maintained normal DPG levels for 35 days of storage. It is suggested that if all blood bank units are going to have normal DPG levels for optimal oxygen transport at the time of transfusion then a CPD preservative with a higher pH and/or metabolic nutrients and regulators such as inosine or methylene blue would be required.

Adenine↗
PubMed1975

Hemoglobin function in stored blood. XIII. A citrate-adenine preservative with optimal pH to maintain red cell 2,3-DPG (function) and ATP (viability).

Increasing pH by a 0.5 increment over the commonly used preservative, acid-citrate-dextrose with adenine (ACD-Ad), results in a significant improvement in 2,3-DPG, with no significant loss in concentrations of ATP. The intermediate pH preservative, 6.0, also had ATP concentrations which equaled those of the low pH preservatives, 5.0 and 5.5, from the 21st to the 42nd day of storage. A citrate-adenine preservative, with a pH between 5.5 and 6.0, would seem to be optimal for maintenance of hemoglobin function and red cell viability, as determined by measurements of 2,3-DPG and ATP concentrations.

Adenosine Triphosphate↗