Biomedical subjects

B A Liles

Publications and source records attributed to B A Liles.

5 recordsLinked to original sources

PubMed1983

In vitro assessment of platelet damage during rotator storage.

The measurement of beta-thromboglobulin (BTG) and platelet lactic dehydrogenase (LDH) as markers for alpha-granule release and platelet lysis, respectively, has been reported to correlate with the amount of damage incurred during the preparation and storage of platelet concentrates. We compared the concentrations of these markers in the supernatant plasma of platelets stored on platform, elliptical, and circular rotators. Significant BTG release occurred after 24 hours on all three rotators (P less than 0.01), but LDH discharge after 24 hours was significant (P less than 0.05) only with elliptical rotation. BTG and LDH levels were not significantly different at any time when platform and circular rotations were compared, but both markers were significantly (P less than .05) higher during elliptical rotation. The lower levels of BTG release and LDH discharge during platform and circular agitation implies that these rotators produce less in vitro platelet activation and damage than occurs with elliptical agitation.

Beta-Globulins↗

PubMedDate not supplied

Center error reduction by recheck of blood type.

Our computer system currently stores donor blood types for seven years and checks typing of all repeat donors against these files. In a recent three-month period (42,500 units), five discrepancies were found--two representing current error. Retrospective analysis of 18 errors made over the last three years showed that 11, or 58 per cent would have been caught by this system. Eight of these latter errors were in Du-typing, and three were ABO errors. These errors lead to patient problems only if the receiving hospital releases the blood in an emergency without retesting. Even were this to happen, significant untoward reactions would be infrequent. The costs of error reduction must be carefully examined. Systems to reduce errors further may be warranted only if hospitals are not longer required to retest blood.

ABO Blood-Group System↗

PubMedDate not supplied

HLA antibody screening.

Explore the source record for details and available documents.

Antilymphocyte Serum↗

PubMedDate not supplied

Preparation of granulocyte concentrates for neonatal patient transfusion.

As an adjunct to antibiotic therapy, granulocytes for infusion often are required within hours of the diagnosis of neonatal sepsis. The logistics of obtaining granulocytes by leukapheresis were evaluated in order to provide, at short notice, a low volume, highly concentrated product. An average of 4.0 X 10(9) granulocytes in a mean volume of 101.5 ml of plasma was collected after processing an average of 3 liters of blood from each of three donors. Following centrifugation of these products, the volume of the final products was reduced by an average of 54.3 percent, while only 10.2 percent of the granulocytes were lost. One of the products, containing 4.8 X 10(9) granulocytes in a volume of 44 ml, was infused into a 3.4 kg septic neonatal patient within 4 hours of receipt of the order by the blood bank. We conclude that it is possible to collect high concentrations of granulocytes for neonatal transfusion in a timely manner by following the protocol described in this report.

Blood Donors↗

PubMedDate not supplied

Validity of testing alanine aminotransferase in refrigerated whole blood.

Alanine aminotransferase (ALT) was tested in the sera and plasma of in-line segments as well as the main bags of whole blood units collected from blood donors. The purpose of this study was to evaluate the stability of enzyme activity during blood storage when the analysis of ALT is postponed over weekends or holidays. In addition, when validation of a particular result is requested, an in-line segment may be convenient for confirmatory testing. While a dilutional effect was found, the anticoagulant in the main collection bag was not shown to have affected enzyme activity. During storage the mean enzyme concentration decreased. Appropriate plasma ALT cutoffs for respective time periods during storage were calculated to compensate for downward drift. This correction prevented the use of the blood units (40% of total) that would erroneously have appeared transfusable if the serum cutoff had been used. If the Day 0 plasma cutoff was used throughout the total storage time period, 14 percent of the blood would erroneously have appeared transfusable.

Aspartate Aminotransferases↗