Abstract:
BACKGROUND:Hemolytic transfusion reactions (HTRs) due to anti-P1 have rarely been reported. There is only one report (from 1945) of an acute HTR due to anti-P1. CASE REPORT:A 74-year-old woman with anti-P1 was given blood that had been found to be compatible by the use of prewarmed serum and saline-suspended red cells (RBCs) and of an antiglobulin test with anti-IgG. The test mixtures were not centrifuged or inspected for agglutination after the 37 degrees C incubation phase. After transfusion of 50 mL of P1 + blood, the patient had an acute HTR (hemoglobinemia, hemoglobinuria, and increased blood pressure, temperature, and respiration). RESULTS:When studied by a reference laboratory, the anti-P1 was shown to be easily detectable (3+ agglutination) by a prewarming technique (saline or low-ionic-strength saline [LISS]), which included centrifugation at 37 degrees C, but only weak reactions were observed when centrifugation after 37 degrees C incubation was omitted. The indirect antiglobulin test was weakly positive (1+) with anti-IgG, but polyspecific anti-human globulin reacted 2+. The anti-P1 agglutinin was IgM, and its titer was 16 at 37 degrees C (prewarmed) and 256 at 23 degrees C; it caused hemolysis of RBCs at 37 degrees C under conditions known to enhance hemolysis. An indirect monocyte monolayer assay gave results of 11.2 and 22 percent in testing of P1 + RBCs incubated with the patient's serum alone and with patient's serum plus fresh normal serum (as a source of complement), respectively (normal < or = 3%). CONCLUSION:An acute HTR was caused by a hemolytic anti-P1 that reacted at 37 degrees C. This antibody was not detected by the hospital in a prewarmed crossmatch that omitted 1) the addition of LISS, 2) the reading for agglutination after the 37 degrees C incubation, and 3) the use of antiglobulin sera containing anti-complement.
journal_name
Transfusionjournal_title
Transfusionauthors
Arndt PA,Garratty G,Marfoe RA,Zeger GDdoi
10.1046/j.1537-2995.1998.38498257376.xsubject
Has Abstractpub_date
1998-04-01 00:00:00pages
373-7issue
4eissn
0041-1132issn
1537-2995journal_volume
38pub_type
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