PubMed · 13731478
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W OSTEN. 1960. [Thrombocyte function and thrombopathies].. https://pubmed.ncbi.nlm.nih.gov/13731478/
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The aim of this study was to compare the quality of solvent/detergent (SD) treated plasma, Octaplas, and single-donor fresh-frozen plasma (FFP) units during 48-h storage after thawing. Octaplas bags of different blood groups and individual FFP units were thawed and stored at either +4 degrees C or at room temperature (RT) for 48 h. Samples drawn during the observation period were investigated on various coagulation factor and protease inhibitor activities using standard coagulation and chromogenic assays. The generation of FVIIa was followed as a marker of coagulation factor activation. All investigated coagulation factors and protease inhibitors were stable for at least 8h during storage of Octaplas at +4 degrees C. FVIII levels started to decline earlier in FFP than in Octaplas at both storage temperatures. Stored Octaplas OD660 values were more stable during the storage period than FFP OD660 values, whereas VWF multimeric patterns were comparably stable in both types of plasma. In conclusion, this stability study has demonstrated that thawed Octaplas maintains its high quality, even with a time safety margin, for 8 h at +4 degrees C and for 6 h at RT. In general, there was more variability in coagulation factor levels among different FFP units compared with different Octaplas batches.
The Sysmex CA-7000 is a fully automated multiparameter hemostasis analyzer equipped with a photo-optical clot detection unit and a cap-piercing system. It is designed to perform coagulation tests as well as chromogenic and immunologic assays. It was evaluated in a coagulation laboratory of a university hospital with respect to its technical characteristics in the determination of routine coagulation (prothrombin time, activated partial thromboplastin time, fibrinogen and single coagulation factors), chromogenic (antithrombin, and anti-FXa activity) and immunologic assays (von Willebrand factor). The intra-assay and inter-assay coefficients of variation (CV) were below 5% for most parameters both in the normal and in the pathological range (exceptions: intra-assay CV=5.2% for the fibrinogen and 5.1% for antithrombin in the low range of concentrations; and inter-assay CV=5.7% and 7.2% for clotting factors V and VII levels in the normal ranges, and in the range from 6.1% to 7.8% for anti-FXa activity). No significant interference could be demonstrated with hemolytic and icteric samples as demonstrated by results similar to those obtained using a mechanical clot detection-based analyzer (STAR). No carryover was detected in alternating measurements of heparinized (1.0 IU/mL unfractionated heparin) and normal plasma samples. The results of the different coagulation, chromogenic and immunologic assays obtained with the CA-7000 analyzer were well correlated with those obtained on the STAR analyzer (r in the range from 0.885 to 0.990). Our results demonstrated that using the CA-7000 analyzer, routine coagulation testing can be performed with satisfactory precision and the same applied to more specialized and specific tests such as single factor activity or antigen concentration.
OBJECTIVE: The purpose of this study was to describe the sequential changes in commonly obtained laboratory values after coronary artery bypass grafting (CABG) with cardiopulmonary bypass (CPB). METHODS: The authors examined laboratory data from 375 patients who underwent uncomplicated CABG with CPB in a multicenter clinical trial of a medication for postoperative pain. Data were obtained preoperatively, at the time of postoperative extubation, and at 4 subsequent intervals ending 14 days after extubation. Data obtained before study drug administration are reported for all patients; thereafter, only data from placebo patients without perioperative complications (n=123) are reported. RESULTS: Mean postoperative coagulation values remained within their reference ranges at the time of extubation. However, platelet counts increased to a peak value well above the reference range by the end of the study. Postoperative white blood cell counts rose above the reference range, mainly because of increased neutrophils. Serum chemistries were also altered; most patients showed a persistent postoperative hyperglycemia. Creatine kinase levels rose to nearly 4 times the upper limit of the reference range in the early postoperative period. Lactate dehydrogenase, serum aspartate aminotransferase, and alanine aminotransferase levels also increased above the reference range. Total protein and albumin values were below the reference range throughout the postoperative period. CONCLUSIONS: Laboratory values for hematology, blood coagulation, and serum chemistry change substantially after uncomplicated CABG with CPB. Recognition of these changes will facilitate the conduct of clinical research and may prevent inappropriate treatment based on abnormal laboratory findings that have no clinical significance.