BackgroundWhole blood viscoelastic testing (VET) devices are routinely used in a variety of clinical settings to assess hemostasis. The Quantra QStat System is a cartridge-based point of care VET device that measures changes in clot stiffness during coagulation and fibrinolysis using ultrasound detection of resonance. The objective of this study was to assess the ability of the Quantra QStat System to detect coagulopathies in trauma patients.MethodsA multicenter observational study was conducted on adult subjects at two level 1 trauma centers. For each subject, whole blood samples were drawn upon arrival to the emergency department and again, in some cases, after administration of blood products and/or antifibrinolytics. Samples were analyzed on the Quantra in parallel to ROTEM delta. The QStat cartridge provides measures of Clot Time (CT), Clot Stiffness (CS), Fibrinogen and Platelet Contributions to clot stiffness (FCS and PCS), and Clot Stability to Lysis (CSL). Data analyses included linear regression of Quantra and ROTEM parameters and an assessment of the concordance of the two devices for the assessment of hyperfibrinolysis.ResultsA total of 56 patients were analyzed. 42% of samples had a low QStat CS value suggestive of an hypocoagulable state. The low stiffness values could be attributed to either low PCS, FCS or combination. Additionally, 13% of samples showed evidence of hyperfibrinolysis based on the QStat CSL parameter. Samples analyzed with ROTEM assays showed a lower prevalence of low CS and hyperfibrinolysis based on EXTEM and FIBTEM results. The correlation of CS, FCS and CT versus equivalent ROTEM parameters was strong with r-values of 0.83, 0.79 and 0.79, respectively.DiscussionThis first clinical experience with the Quantra in trauma patients showed that the QStat Cartridge was strongly correlated with ROTEM parameters and that it could detect coagulopathies associated with critical bleeding.Level of evidenceDiagnostic test, Level II.

Background and Objectives: Mortality rates, transfusion ratios, trauma management logistics, and assault characteristics from the El Paso mass shooting incident (MSI) are evaluated in comparison to other MSIs. In 2019, El Paso, TX experienced the eighth-deadliest MSIs in modern US history. In this 21st mass killing in the United States of 2019, 19 people died immediately, and four of 27 injured, later died from ballistic injuries. Materials and Methods: We examined the victims' injuries, pre-hospital treatments, transfusions, rotational thromboelastometry (ROTEM) interpretation, tranexamic acid (TXA) use, and compared El Paso's outcomes with other MSIs.Results: Fifteen casualties were treated for bullet injuries at University Medical Center (UMC). Three were in critical condition; one died during surgery. Of the remaining victims, two were guarded, and the remaining ten in stable condition. Anatomic trauma locations included chest, abdomen, hip, breast, thigh and arm. Haemostatic agents and TXA were administered to arriving patients. Seven casualties receiving blood products were administered 95 units at UMC (45 red blood cells [RBC], 38 fresh frozen plasma[FFP], 8 platelets and 4 cryoprecipitate). ROTEM guided mass transfusion decisions in three patients. Out of seven MSIs reviewed, El Paso had the highest mortality rate (50.0%) and lowest RBC:FFP:admission ratio (1.18 at UMC). Conclusion:We report the greatest proportion of transfusions per admission for an MSI and are first to discuss ROTEM roles to guide transfusion and manage coagulopathy during an MSI. This case highlights the severity and impact of MSIs on victims and requirements to follow established transfusion protocols with adjunct use of ROTEM, TXA and haemostatic agents.

Objectives This study examines whether patient outcomes were affected when the hemoglobin (Hb) transfusion threshold was lowered by 1 g/dL during COVID-19–related blood shortages. Methods Outcomes of lowered Hb thresholds (from <7 to <6 g/dL) were defined by 14-month intervals in 2 patient groups (prepandemic [January 2019-February 2020] and pandemic [April 2020-May 2021]). We evaluated patient admissions, pretransfusion (if transfused) or nadir admission (if not transfused) Hb levels between 5.0 and 8.0 g/dL, and total red blood cell (RBC) transfusions during admission (if transfused). Baseline variables and outcomes were selected from electronic health records. Primary COVID-19–related admissions were excluded. Regression analysis was conducted to determine outcomes. Results Those in the prepandemic group (1976) and pandemic group (1547) were transfused. Fewer RBCs (2186, vs 3337) were used in the prepandemic group than in the pandemic group, respectively. Those in the prepandemic group had significantly higher rates of hypertension and diabetes as well as more smokers. Significant differences were observed when comparing the number of procedures and incidence of sepsis between the patient groups. Similar patterns were observed for the not transfused and transfused subgroups. Conclusions Patient outcomes were not affected after implementing lower Hb pretransfusion thresholds. Although confounding factors were mitigated, some may have been associated with procedures or sepsis. Proactive patient blood management strategies during COVID-19–related blood shortages may include adopting lower Hb thresholds.