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Mechanisms of severe transfusion reactions
1Sacramento Blood Centers, CA 95816-7089, United States.
Abstract:
Serious adverse effects of transfusion may be immunologically or non-immunologically mediated. Currently, bacterial contamination of blood products, particularly platelets, is one of the most significant causes of transfusion-related morbidity and mortality. Septic transfusion reactions can present with clinical symptoms similar to immune-mediated hemolytic transfusion reactions and transfusion-related acute lung injury. Extremely high fever and/or gastrointestinal symptoms, in a transfusion recipient, may be indicative of sepsis. The diagnosis is based upon culturing the same organism from both the patient and the transfused blood component. Numerous organisms have been implicated as the cause of septic transfusion reactions. Due to different storage conditions, gram negative organisms are more often isolated from red blood cell components; gram positive organisms are more often isolated from platelets. Prevention of septic transfusion reactions is primarily dependent on an adequate donor history and meticulous preparation of the donor phlebotomy site. Visual inspection of blood components prior to transfusion is also vital to preventing these reactions. Several methods of detection of bacterial contamination and inactivation of pathogens are currently under active investigation.
Insights
Bacterial contamination in blood products, especially platelets, causes serious transfusion reactions and death. Early diagnosis and prevention through donor screening and careful handling are crucial to patient safety.
Area of Science:
- Transfusion Medicine
- Infectious Disease
Background:
- Bacterial contamination of blood products is a significant cause of transfusion-related morbidity and mortality.
- Septic transfusion reactions can mimic other serious transfusion complications, complicating diagnosis.
- High fever and gastrointestinal symptoms in recipients may indicate sepsis.
Purpose of the Study:
- To highlight the risks associated with bacterial contamination in transfused blood products.
- To discuss diagnostic approaches for septic transfusion reactions.
- To outline current and potential prevention strategies.
Main Methods:
- Diagnosis relies on culturing the causative organism from both the patient and the blood component.
- Organism types vary based on blood product storage (e.g., Gram-negative in RBCs, Gram-positive in platelets).
Main Results:
- Bacterial contamination is a leading cause of transfusion-related mortality.
- Different organisms are prevalent in different blood components due to storage conditions.
- Effective prevention strategies are essential.
Conclusions:
- Preventing septic transfusion reactions requires rigorous donor history and aseptic technique during phlebotomy.
- Visual inspection of blood components before transfusion is a critical safety measure.
- Ongoing research focuses on improved detection and pathogen inactivation methods.