Leukocyte depletion filters should be used with apheresis platelets.
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Blood Platelets↗
Biomedical subjects
B Wenz
Publications and source records attributed to B Wenz.
Detection of hepatitis B surface antigen with the miniature centrifugal fast analyzer. A modified reversed passive hemagglutination procedure.
A modified reversed passive hemagglutination test for the detection of hepatitis B surface antigen HBsAg is described. Sera and reagent cells coated with antibody to HBsAg (anti-HBs) are loaded separately into the rotor of a miniature centrifugal fast analyzer. The rotor is centrifuged briefly to transfer the components into its cuvettes. After mixing, the suspensions are allowed to stand at room temperature for 30 min, following which the rotor is again centrifuged and the absorbance of each cuvette is monitored. Cells suspended in serum containing HBsAg leave the light path more rapidly than cells suspended in sera free of antigen. The magnitude of change in absorbance varies directly with the concentration of the antigen. In 45 sera tested by the conventional V-plate technique, findings were as follows: 21 positive, 19 false positive and 5 negative. The automated procedure unequivocally differentiated the 21 positives; results for the false positive and negative specimens were identical and clearly distinguishable from the positive results. The automated procedure enhances specificity, offers equivalent sensitivity, and results that are quantitative and objective.
Absorption↗
Improved method for detecting hemagglutination by centrifugal analysis.
Centrifugal analysis can be used to detect hepatitis B surface antigen, antibody to rubella virus, and fibrin-related antigen. The procedure is performed with the same reagents used in conventional hemagglutination studies. Positive and negative reactions are distinguished by the rates of erythrocyte clearance in the centrifugal field (delta A/delta time); positive cells move more rapidly than negative cells, and this difference varies directly with the concentration of detectable antigen or antibody. This phenomenon is thought to be a result of the greater adhesion of negative cells to the cuvette's surface. Sensitivity and specificity are greater in the centrifugal analysis technique than in the more conventional hemagglutination tests. False-positive reactions are eliminated and the quantitative data are accurate and reproducible.
Antibodies↗
Thyroid disease and red-cell autoantibodies.
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Adolescent↗
The effect of thrombocytopenia on experimental arteriosclerotic lesion formation in rabbits. Smooth muscle cell proliferation and re-endothelialization.
This study was designed to investigate the mechanisms involved in fibromusculoelastic lesion formation produced by selective de-endothelialization by the intra-arterial balloon catheter technique in thrombocytopenic rabbits. Thrombocytopenia was induced and maintained for up to 30 days by daily injections fo highly specific sheep anti-rabbit platelet sera (APS). Evidence for re-endothelialization was obtained by i.v. Evans blue dye 30 min before sacrifice. Rabbits received daily injections of APS, which reduced the mean platelet count to 5,600/cm3; control animals received identically treated normal sheep sera on the same schedule, and had mean daily platelet counts of 363,000/cm3. Evaluation of intimal thickness was assessed by counting cell layers in semithin sections. Intimal thickening in aortae from rabbits treated with APS was strikingly suppressed, in contrast to those from normal sheep sera-treated animals which showed a mean intimal thickness of 18 cell layers within 28 days often after de-endothelialization. Re-endothelialization was not affected by APS treatment. These results indicate that the proliferation of smooth muscle cells is dramatically inhibited by reduction of platelets.
Animals↗
Development of direct antiglobulin reaction accompanying alloimmunization in a patient with Rhd (D, category III) phenotype.
New examples of the Rhd (D, category III) red cell phenotype are described in three siblings. One of these individuals who had previously been transfused, received three units of Rho(D) positive blood several years later and developed a high titer anti-RhD antibody. This anamnestic response was associated with the development of an autoantibody which persisted for a period of at least 8 months. This observation represents another example of autoimmunization which has rarely been observed to accompnay alloimmunization.
Adult↗
Eluate analysis of anti-Bg a associated renal allograft rejection.
Renal allograft rejection, following development of a positive indirect antiglobulin reaction, occurred in a multiply transfused recipient. Panel techniques confirmed both anti-Bga and anti-Kell antibodies. Recognition of the concordant antigenic specificity of the Bga and HL-A7 antigens led to an investigation of the potential role of this antibody in the rejection phenomenon. In the absence of serological cytotoxicity, a modified elution technique was used to directly obtain immunoglobulin from the rejected allograft. The eluate obtained displayed specificity for the Bga red blood cell antigen. The described technique affords an additional approach to the documentation of immunologically mediated graft rejection and obviates the limitations imposed by the absence of serological cytotoxicity. Emphasis is placed on the need for recognition of the relationship between red blood cell and HL-A antigens.
Adolescent↗