Fatal reaction to transfusion of red-cell concentrate contaminated with Serratia liquefaciens.
Boulton FE. Chapman ST. Walsh TH.
National Blood Service, Southampton, Centre, UK.
A 60-year-old woman undergoing surgery died from endotoxic shock and DIC after receiving a 19-day-old unit of optimal additive red-cell concentrate found contaminated with Serratia liquefaciens. No source of contamination could be found. This normally free-living organism is usually of low pathogenicity. It is a very unusual contaminant of stored donated blood, although it appears to be on the increase. When transfused, blood contaminated with S. liquefaciens always causes severe morbidity and is associated with a high death rate. This is the fifth report in the English literature.
Transfusion of white-cell containing allogeneic blood components and postoperative wound infection: effect of confounding factors.
Vamvakas EC. Carven JH.
Massachusetts General Hospital, Department of Pathology, Harvard Medical School, USA.
Randomized controlled trials (RCTs) of the relationship between allogeneic transfusion and post-operative bacterial infection at any site have generated discordant results, but have suggested an association of transfusion with wound infection. To examine the specific association of perioperative transfusion with wound infection, we reviewed the records of 964 consecutive patients undergoing elective colorectal cancer resection at our hospital. Diagnoses of wound infection were made retrospectively by the Centers for Disease Control criteria, and transfusion was defined as number of units of white-cell containing allogeneic blood components received. The probability of wound infection in association with the transfusion was calculated following adjustment for the effects of 12 confounders that had not been previously considered in combination. These factors related to severity of illness, difficulty of operation and risk of wound infection. Wound infection developed in 39 (11.4%) transfused patients, as compared to 24 (3.9%) untransfused subjects (P < 0.0001). In the multivariate analysis, there was a trend suggesting an adverse transfusion effect, which amounted to a 7% increase in the risk of wound infection per unit of red cells or platelets transfused (relative risk [RR] = 1.07; 95% confidence interval for RR = 0.98-1.16; P = 0.1241). This marginally significant effect was related to post-operative (P = 0.1274), rather than perioperative (P = 0.3061), transfusion. We conclude that allogeneic transfusion may perhaps be associated with a small increase in the risk of post-operative wound infection, but this small effect can be established only by RCTs enrolling several thousand patients. The modest magnitude of the effect may have been responsible for the disagreements among the published RCTs.