Prevention of allergic transfusion reactions to platelets and red blood cells through plasma reduction
ABSTRACT The incidence of allergic transfusion reactions (ATRs) ranges from 1% to 3% of all transfusions, and they are difficult to prevent. This study evaluated whether removing plasma from apheresis platelets (APs) or red blood cells (RBCs) by concentrating or washing transfusion products can decrease the incidence of ATRs.
A retrospective cohort study of 179 individuals who received unmanipulated and subsequently concentrated and/or washed APs was conducted. Poisson regression with generalized estimating equations was used to estimate the incident rate ratios and 95% confidence intervals (CIs) of ATRs.
The incidence of ATRs to unmanipulated APs was 5.5% (306 ATRs/5575 AP units). The incidence decreased to 1.7% (135 ATRs/4327 AP units) when individuals received concentrated APs (73% reduction; 95% CI, 65%-79%) and 0.5% (21 ATRs/4082 AP units) when individuals received washed APs (95% reduction; 95% CI, 91%-97%). Of the 39 individuals who received unmanipulated RBCs and subsequently washed RBCs, the incidence of ATRs decreased from 2.7% (33 ATRs/1236 RBC units) to 0.3% (2 ATRs/733 RBC units; 89.4% reduction; 95% CI, 55.5%-97.5%). The median number of AP transfusions to first ATR was six (interquartile range [IQR], 2-19) for unmanipulated APs and increased to 13 (IQR, 4-32) for concentrated APs and 40 (IQR, 29-73.5) for washed APs.
Concentrating APs and washing APs and RBCs substantially reduces ATRs, suggesting that the plasma component of APs and RBCs has an essential role in the etiology of ATRs.
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ABSTRACT: Although acute non-haemolytic febrile or allergic reactions (ATRs) are a common complication of transfusion and often result in little or no morbidity, prompt recognition and management are essential. The serious hazards of transfusion haemovigilance organisation (SHOT) receives 30-40 reports of anaphylactic reactions each year. Other serious complications of transfusion, such as acute haemolysis, bacterial contamination, transfusion-related acute lung injury (TRALI) or transfusion-associated circulatory overload (TACO) may present with similar clinical features to ATR. This guideline describes the approach to a patient developing adverse symptoms and signs related to transfusion, including initial recognition, establishing a likely cause, treatment, investigations, planning future transfusion and reporting within the hospital and to haemovigilance organisations. Key recommendations are that adrenaline should be used as first line treatment of anaphylaxis, and that transfusions should only be carried out where patients can be directly observed and where staff are trained in manging complications of transfusion, particularly anaphylaxis. Management of ATRs is not dependent on classification but should be guided by symptoms and signs. Patients who have experienced an anaphylactic reaction should be discussed with an allergist or immunologist, in keeping with UK resuscitation council guidelines.British Journal of Haematology 08/2012; 159(2):143-53. DOI:10.1111/bjh.12017 · 4.96 Impact Factor
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ABSTRACT: The biologic mechanisms of allergic transfusion reactions (ATRs) are largely unknown. We sought to compare the atopic predisposition of platelet (PLT) recipients who experienced an ATR to nonreactive control recipients. We identified 37 consecutive apheresis PLT recipients who experienced an ATR and 26 matched controls. Total immunoglobulin (Ig)E and aero- and food allergen-specific IgE were quantified in plasma by a blood test for allergies (ImmunoCAP: Phadiatop and Fx5). IgE testing of apheresis PLT supernatants was also performed. Pruritus and urticaria were manifest in 91.9 and 83.8% of all ATRs, with more severe respiratory symptoms and angioedema occurring in less than 15% of cases. No subject had anaphylaxis. Sex, age, and primary diagnosis were balanced between the two groups. Total and aeroallergen-specific IgE was higher among subjects experiencing an ATR in comparison to control subjects (median total IgE, 55.5 kU/L vs. 8.3 kU/L, p = 0.002; and median aeroallergen-specific IgE, 0.57 kUa/L vs. 0.36 kUa/L, p = 0.046). IgE antibody levels in apheresis products associated with ATRs were similar to control products (p > 0.1 for all IgE tests). Recipient atopic predisposition, as defined by IgE sensitization, is a risk factor associated with ATRs.Transfusion 05/2011; 51(11):2337-42. DOI:10.1111/j.1537-2995.2011.03160.x · 3.57 Impact Factor
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ABSTRACT: Platelet additive solutions (PASs) facilitate improved recovery of plasma and may reduce the severity and/or frequency of plasma-associated transfusion reactions. Current apheresis platelet (PLT) PAS products contain approximately 30 to 40% residual plasma. In an effort to further decrease the residual plasma, two in vitro studies were conducted with PLTs suspended in 5% plasma and a reformulated PAS-3, named PAS-5, that contains additional salts, glucose, and bicarbonate. In Study 1, PLTs suspended in 5% plasma/95% PAS-5 were prepared directly on a separator (Amicus, Fenwal, Inc.) without additional centrifugation or washing. In Study 2, a double unit of hyperconcentrated Amicus PLTs in plasma was collected, divided, and centrifuged to prepare a control unit in 100% plasma and a paired test unit in 5% plasma/95% PAS-5. The in vitro properties of PLTs were assessed in both studies during 7-day storage at 20 to 24°C with continuous agitation. In Study 1, PLT concentration, pH, mean PLT volume (MPV), HCO(3)(-), pCO(2), pO(2), lactate dehydrogenase, and hypotonic shock response (HSR) did not significantly change during storage. By Day 7, glucose levels and morphology scores modestly decreased (17.6 and 14.4%, respectively) and lactate levels modestly increased (to 7.2 mmol/L). In Study 2, MPV, pH, glucose, pO(2), HSR, and morphology were comparable in control and test PLTs during 7-day storage. Glucose consumption and lactate production were significantly less in test versus control PLTs (p≤0.0015). Extent of shape change and %CD62P-positive test PLTs were less than those of controls (p<0.001). Apheresis PLTs suspended in 5% plasma/95% PAS-5 maintained in vitro properties during 7-day storage.Transfusion 07/2011; 52(1):188-94. DOI:10.1111/j.1537-2995.2011.03252.x · 3.57 Impact Factor