Abstract:
BACKGROUND:To investigate how a delay between pretransfusion platelet count measurement and actual platelet transfusion affects the assessment of platelet transfusion responses, the rate of reduction in platelet counts was determined in 30 patients with relatively uncomplicated thrombocytopenia. STUDY DESIGN AND METHODS:Fifteen adult and 15 pediatric patients admitted for hematopoietic stem and progenitor cell transplantation were studied. Platelet counts before and after myeloablative conditioning and after prophylactic platelet transfusions were determined and studied as a function of time. The rates of reduction in platelet counts were determined by linear regression analysis. RESULTS:Platelet counts were reduced at linear rates after myeloablative conditioning or prophylactic platelet transfusion in all 30 patients. The average rates of reduction in platelet counts after myeloablation were 1261 +/- 583 and 1070 +/- 492 platelets per microL per hour (mean +/- SD) for adult and pediatric patients, respectively. The average rate of reduction after platelet transfusions during the thrombocytopenic phase was 740 +/- 280 and 820 +/- 288 platelets per microL per hour (mean +/- SD) for adult and pediatric patients, respectively. The rates of reduction in platelet counts between the two phases were significantly different in the two age groups (adult, p < 0.0001; pediatric, p < 0.015) and were proportionally correlated with initial platelet counts immediately before myeloablation and after prophylactic platelet transfusions. CONCLUSION:The rate of reduction in platelet count can have a significant impact on the evaluation of platelet transfusion responses when there is a delay between pretransfusion measurement of platelet count and the initiation of platelet transfusion. In addition, the rate of platelet reduction determined from this study can be used to confirm an accelerated rate of platelet consumption in thrombocytopenic patients.
journal_name
Transfusionjournal_title
Transfusionauthors
del Rosario ML,Kao KIdoi
10.1046/j.1537-2995.1997.37111298088046.xsubject
Has Abstractpub_date
1997-11-01 00:00:00pages
1163-8issue
11-12eissn
0041-1132issn
1537-2995journal_volume
37pub_type
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