Background:Allergic transfusion reactions (ALTR) are very common complication of blood transfusion. Advances in transfusion medicine have
significantly decreased the incidence of ALTR; however, ALTR continue to be burdensome for transfusion dependent patients. It increases their
existing sufferings. Allergic reaction is more common in platelet concentrate transfusion because stored platelet concentrate supernatants (PCSNs) accumulate striking levels of biological response modifiers (BRMs) during storage.
Objective: To determine the risk factors of allergic reactions in platelate concentrate transfusion.
Method: It is a case control study enrolled a total of 64 diagnosed case of aplastic anaemia receiving transfusion of platelet concentrate at
Department of Transfusion Medicine, BSMMU, Dhaka, from May 2015 to April 2016. Among them 32 case of aplastic anaemia having allergic
reaction due to transfusion of platelet concentrate was considered as group I (case) and rest 32 patients not developed allergic transfusion reaction
due to transfusion of platelet concentrate was considered as group II (control). Patients age belong to 5 - 50 years and both sex and also patients
getting transfusion of plate late concentrate were enrolled in this study.
Statistical analysis: Statistical analyses were carried out by using the Statistical Package for Social Sciences version 20.0 for Windows (SPSS Inc.,
Chicago, Illinois, USA). Chi-Square test, Odds ratio with 95% CI used to analyze the categorical variables, shown with cross tabulation. Student ttest used for continuous variables. Significant value of 'p' was decided to be at a level of 0.05 in two tailed tests.
Result: The mean age was found 22.1±11.58 years in group I and 23.5±3.8 years in group II. Twenty four (75.0%) patients were male in group I and
17(53.1%) patients in group II. Almost twenty (62.5%) patients come from urban area in group I and 19(59.4%) in group II. In group I, thirty two
(100.0%) patients had urticarialrash, 100.0% had itching, 37.5% had angioedema, 3.1% had cough, 3.1% had chest pain, 3.1% had respiratory distress,
3.1% had fever and 3.1% had vomiting. Almost twenty(62.5%) patients had tachycardia (>100 bpm) in group I and all patients had normal pulse in
group II.Thirty two (100.0%) patients had normal blood pressure in both group. In group I, 31(96.9%) patients developed mild allergic reaction, 3.1%
moderate allergic reaction. Majority (40.6%) patients belonged to age 16-30 years in present allergic transfusion reaction and 11(34.3%) in absent
allergic transfusion reaction. Most (40.6%) of the patients was found blood group B in present allergic transfusion reaction and 11(34.4%) in absent
allergic transfusion reaction. Multiple unit of PC transfusion increases 3.69 times risk to develop allergic transfusion reactions with 95% CI 0.99 to
14.44%.Platelet concentrate storage>3daysincreases 5.95timesrisktodevelopallergic transfusionreactionwith95%CI1.75to21.09%.
Conclusion: Multiple unit (≥2) transfusion and Platelet concentrate storage >3 days were significantly (p<0.05) associated with allergic
transfusion reactions but no significant association was found between allergic transfusion reactions with age and Blood group
