LAUSR

Supplemental digital content is available in the text. OBJECTIVE Hemorrhage is the leading cause of death after terrorist attack, and the immediacy of labile blood product (LBP) administration has a decisive impact on patients' outcome. The main objective of this study was to evaluate the transfusion patterns of the Paris terrorist attack victims, November 13, 2015. METHODS We performed a retrospective analysis including all casualties admitted to hospital, aiming to describe the transfusion patterns from admission to the first week after the attack. RESULTS Sixty-eight of 337 admitted patients were transfused. More than three quarters of blood products were consumed in the initial phase (until November 14, 11:59 pm), where 282 packed red blood cell (pRBC) units were transfused along with 201 plasma and 25 platelet units, to 55 patients (16% of casualties). Almost 40% of these LBPs (134 pRBC, 73 plasma, 8 platelet units) were transfused within the first 6 hours after the attack. These early transfusions were massive transfusion (MT) for 20 (6%) of 337 patients, and the average plasma/red blood cell ratio was 0.8 for MT patients who received 366 (72%) of 508 LBPs. The median time from admission to pRBC transfusion was 57 (25–108) minutes and 208 (52–430) minutes for MT and non-MT patients, respectively. These same time intervals were 119 (66–202) minutes and 222 (87–381) minutes for plasma and 225 (131–289) minutes and 198 (167–230) minutes for platelets. CONCLUSION Our data suggest that improving transfusion procedures in mass casualty setting should rely more on shortening the time to bring LBP to the bedside than in increasing the stockpile. LEVEL OF EVIDENCE Epidemiological study, Therapeutic IV.