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A prospective study of symptomatic bacteremia following platelet transfusion and of its management
Background:
The danger of bacteremia due to contaminated platelets is not well known. There are also no established guidelines for the management of febrile reactions after platelet transfusion.
Study Design And Methods:
To determine the risk of symptomatic bacteremia after platelet transfusion, 3584 platelet transfusions given to 161 patients after bone marrow transplantation were prospectively studied. Platelet bags were routinely refrigerated for 24 hours after transfusion. Septic work-up was initiated for a temperature rise of more than 2 degrees C above the pretransfusion value within 24 hours of platelet transfusion or a temperature rise of more than 1 degree C that was associated with chills and rigor. Diagnosis of bacteremia after platelet transfusion was made only when the pairs of isolates from the blood and the platelet bags were identical with respect to their biochemical profile, antibiotic sensitivity, serotyping, or ribotyping.
Results:
Thirty-seven febrile reactions, as defined above, occurred. Bacteremia subsequent to platelet transfusion was diagnosed in 10 cases. There was a 27-percent chance (95% CI, 15-43%) that these febrile reactions represented bacteremia that resulted from platelet transfusion. For a subgroup of 19 patients with a temperature rise of more than 2 degrees C, the risk of bacteremia was 42 percent (95% CI, 23-64%). Septic shock occurred in 4 of the 10 bacteremic patients. A rapid diagnosis was possible because the involved bacteria were demonstrated by direct Gram stain of the samples taken from the platelet bags of all 10 patients.
Conclusion:
Significant febrile reactions after platelet transfusion are highly likely to be indicative of bacteremia. Routine retention of platelet bags for subsequent microbiologic study was useful in the investigation of these febrile reactions. Empiric antibiotic therapy is indicated.
Insights
Febrile reactions after platelet transfusion often indicate bacteremia. Prompt microbiologic testing of platelet bags aids diagnosis and guides empiric antibiotic therapy, improving patient outcomes.
Area of Science:
- Hematology
- Infectious Diseases
- Transfusion Medicine
Background:
- Bacteremia from contaminated platelets poses a significant risk, yet clinical guidelines for managing transfusion-related febrile reactions are lacking.
- This study aimed to quantify the risk of symptomatic bacteremia following platelet transfusion and evaluate diagnostic methods.
Discussion:
- Febrile reactions post-platelet transfusion were prospectively investigated in 1,61 patients undergoing bone marrow transplantation.
- Platelet bags were retained for 24 hours post-transfusion for microbiological analysis.
- Diagnostic criteria included temperature elevations and confirmed identical bacterial isolates from patient blood and platelet bags.
Key Insights:
- A significant proportion of febrile reactions (27%) were attributed to bacteremia from contaminated platelets.
- In patients with a >2°C temperature rise, the risk of bacteremia increased to 42%.
- Rapid bacterial identification via Gram stain of platelet bag samples facilitated timely diagnosis in all bacteremic cases.
Outlook:
- Significant febrile reactions following platelet transfusion strongly suggest underlying bacteremia.
- Routine retention and microbiologic examination of platelet bags are crucial for investigating febrile reactions.
- Empiric antibiotic therapy is recommended for patients experiencing significant febrile reactions post-platelet transfusion.