Extension with cE-matching of the transfusion policy for women under 45 years to prevent alloimmunization and hemolytic disease of the foetus and newborn (HDFN) was evaluated. After implementation of cEK-matching, anti-c occurrence decreased from 46.8 to 30.4 per 100 000 pregnancies (RR 0.65, 95% CI 0.54-0.79), while anti-E occurrence decreased from 122.1 to 89.9 per 100 000 pregnancies (RR 0.74, 95% CI 0.66-0.84). The c-negative women showed a higher anti-E occurrence before cEK-matching and a more pronounced decline with the new policy. This indicates that cEK-matched transfusion effectively reduces alloimmunization, and that a cK-matched approach could prevent most transfusion-related alloimmunization and HDFN.

UNASSIGNED: Anesthesiologists develop anesthetic plans according to the surgical procedure, patient\'s medical history, and physical exams. Patients with ischemic heart disease are predisposed to intraoperative cardiac complications from surgical blood loss. Unanticipated events can lead to intraoperative complications despite careful anesthesia planning.
UNASSIGNED: This anesthetic management simulation was developed for the anesthesiology residency curriculum during the first clinical anesthesia year (CA 1/PGY 2 residents). A total of 23 CA 1 residents participated. A 50-minute encounter focused on a 73-year-old male who presents for an elective total hip replacement and develops acute myocardial stunning in the setting of critical acute blood loss and a delay in the transportation of blood products.
UNASSIGNED: One hundred percent of the residents felt the simulation was educationally valuable in the immediate postsimulation survey (Kirkpatrick level 1). The follow-up survey showed that 100% of residents felt the simulation increased their knowledge of managing acute cardiac ischemia (Kirkpatrick level 2), and 93% felt it increased awareness and confidence in similar real-life situations that positively affected patient outcomes (Kirkpatrick level 3).
UNASSIGNED: Our simulation provides a psychologically safe environment for anesthesiology residents to develop management skills for acute critical anemia and cardiogenic shock and foster communication skills with a surgery team.

BACKGROUND: Total knee arthroplasty (TKA) carries a significant hemorrhagic risk, with a non-negligible rate of postoperative transfusions. The blood-sparing strategy has evolved to reduce blood loss after TKA by identifying the patient\'s risk factors preoperatively. In practice, a blood count is often performed postoperatively but rarely altering the patient\'s subsequent management. This study aimed to identify the preoperative variables associated with hemorrhagic risk, enabling the creation of a machine-learning model predictive of transfusion risk after total knee arthroplasty and the need for a complete blood count.
OBJECTIVE: Based on preoperative data, a powerful machine learning predictive model can be constructed to estimate the risk of transfusion after total knee arthroplasty.
METHODS: This retrospective single-centre study included 774 total knee arthroplasties (TKA) operated between January 2020 and March 2023. Twenty-five preoperative variables were integrated into the machine learning model and filtered by a recursive feature elimination algorithm. The most predictive variables were selected and used to construct a gradient-boosting machine algorithm to define the overall postoperative transfusion risk model. Two groups were formed of patients transfused and not transfused after TKA. Odds ratios were determined, and the area under the curve evaluated the model\'s performance.
RESULTS: Of the 774 TKA surgery patients, 100 were transfused postoperatively (12.9%). The machine learning predictive model included five variables: age, body mass index, tranexamic acid administration, preoperative hemoglobin level, and platelet count. The overall performance was good with an area under the curve of 0.97 [95% CI 0.921 - 1], sensitivity of 94.4% [95% CI 91.2 - 97.6], and specificity of 85.4% [95% CI 80.6 - 90.2]. The tool developed to assess the risk of blood transfusion after TKA is available at https://arthrorisk.com.
CONCLUSIONS: The risk of postoperative transfusion after total knee arthroplasty can be predicted by a model that identifies patients at low, moderate, or high risk based on five preoperative variables. This machine learning tool is available on a web platform that is accessible to all, easy to use, and has a high prediction performance. The model aims to limit the need for routine check-ups, depending on the risk presented by the patient.
METHODS: II; diagnostic study.

Hematopoietic stem cell transplantation (HSCT) is pivotal in treating hematologic disorders, yet it poses the risk of post-transplantation pancytopenia. Prophylactic platelet transfusions are often administered to mitigate this risk. Utilizing practical markers, such as immature platelet fraction (IPF), to predict hematopoietic recovery in advance could reduce unnecessary prophylactic transfusions. Our prospective study, involving 53 HSCT patients at Taipei Veterans General Hospital between September 2022 and May 2023, utilized the Sysmex XN analyzer to assess peripheral blood cell parameters. We investigated whether IPF could predict platelet recovery early, determined the optimal cut-off value, and compared platelet usage. Neutrophil and platelet engraftment occurred 10 (median; range: 10-12) and 15 (median; range: 15-18) days post-HSCT. Notably, 71.7% of patients exhibited an IPF increase exceeding 2% before platelet recovery. The optimal cut-off IPF on day 10 for predicting platelet recovery within five days was 2.15% (specificity 0.89, sensitivity 0.65). On average, patients received 3.89 units of post-transplantation platelet transfusion. Our results indicate that IPF serves as a predictive marker for platelet engraftment, peaking before the increase in platelet count. This insight aids clinicians in assessing the need for prophylactic platelet transfusions. Integrating reference IPF values alongside platelet counts enhances the accuracy of evaluating a patient\'s hematopoietic recovery status. Anticipating the timing of platelet recovery optimizes blood product usage and mitigates transfusion reaction risks.

BACKGROUND:  Red blood cell (RBC) transfusion is one of the most critical and expensive lifesaving treatment modalities. A clinical audit is a valuable instrument to determine whether transfusion practices align with the guidelines and identify knowledge deficiencies. The study aimed to evaluate the RBC transfusion practices and patient outcomes at the National District Hospital in Bloemfontein, South Africa, and to determine adherence to transfusion guidelines.
METHODS:  A retrospective descriptive study was conducted. All blood transfusion registers in the hospital were used to identify transfusion episodes during the study period. Files were retrieved from the admissions office and information captured on a paper-based datasheet. The appropriateness of the transfusion and adherence to the South African transfusion guidelines were evaluated using specific criteria.
RESULTS:  Of the 118 transfusion episodes during the study period, 78 files were retrieved and 76 included in the study. The patients\' median age was 47 years (interquartile range [IQR]: 32-66 years), with human immunodeficiency viruses (HIV) (n = 34; 44.7%) being the most common comorbid condition. Pre-transfusion haemoglobin was documented for all patients with a median of 4.6 g/dL (IQR: 3.95 g/dL - 5.5 g/dL). The audit revealed that in 68.4% (n = 52) of the cases, the guidelines were applied appropriately.
CONCLUSIONS:  The study described the blood transfusion practices and identified shortcomings when compared with the standard clinical guidelines.Contribution: The study highlights the importance of applying rationale, caution and consideration of the specific patient profile when performing transfusions.

Blood transfusion is a common therapeutic intervention in hospitalized patients. There are numerous indications for transfusion, including anemia and coagulopathy with deficiency of single or multiple coagulation components such as platelets or coagulation factors. Nevertheless, the practice of transfusion in critically ill patients has been controversial mainly due to a lack of evidence and the need to consider the appropriate clinical context for transfusion. Further, transfusion carries many risk factors that must be balanced with benefits. Therefore, transfusion practice in ICU patients has constantly evolved, and we endeavor to present a contemporary review of transfusion practices in this population guided by clinical trials and expert guidelines.

Background: Whole blood is a product that contains all three blood components (plasma, red blood cells, and platelets). This systemic review and meta-analysis was conducted to identify barriers and obstacles to establishing whole blood transfusion protocols in civilian hospitals. Methods: The study was conducted using PRISMA guidelines with PROSPERO registration No. CRD42024519898. Traumatic patients who needed or received whole blood transfusion were included. A systematic literature review employed a comprehensive search strategy through the PubMed, Google Scholar, Web of Science, ScienceDirect, and ProQuest databases. Meta-analysis was utilized to analyze the outcomes. The risk of bias was assessed using the Newcastle-Ottawa Scale. Results: In total, 310 studies were identified, and 11 studies met the inclusion criteria. The following intervals were used to assess the prevalence of mortality: 6 h 12.15% (0.081, 95% CI [0.023, 0.139]), 24 h 14.08% (0.141, 95% CI [0.111, 0.171]), delayed mortality (28-30 days) 22.89% (0.284, 95% CI [0.207, 0.360]), and in-hospital 18.72%, with relative risk (0.176, 95% CI [0.114,0.238]). Conclusions: Traumatic patients can be effectively resuscitated and stabilized with whole blood transfusion (WBT), but it is essential to provide ongoing critical care, address logistical challenges, and prevent blood product wastage. We recommend utilizing WBT in the early stages of resuscitation for adult civilian trauma patients.

Different blood group systems have been characterized in people and other mammals. In domestic cats, the ABC blood group system plays the most important clinical role and has been investigated extensively-from the phenotype to the molecular genetics. In non-domestic felids, phenotypic ABC blood typing has been performed by different methods to detect the antigens, but the four informative CMAH markers in domestic cats were not able to identify types B and C (AB) in non-domestic cats. In this study, 138 blood samples from 15 non-domestic (wild) felid species were investigated by CMAH exonic sequencing and genotyping for putative variants causing type B or C (AB) and correlation to the respective ABC blood phenotype. A total of 58 CMAH variants were found, including 15 missense and 43 synonymous CMAH variants. One variant (c.635G>C) was concordant with blood type B (and C) in cheetahs and type B in cougars, compared to blood type A in all other felid species (lion, tiger, Canada lynx, snow leopard, clouded leopard, serval, jaguar, fishing cat, Pallas cat, bobcat, black footed cat, leopard, and sand cat). Since cheetahs and cougars belong to the genera puma, it could not be determined if the common CMAH variant is either a marker for type B (or C) or is just common in pumas.

OBJECTIVE: To describe clinical characteristics and outcomes, including transfusion requirements, in pediatric patients with congenital heart disease undergoing aspiration thrombectomy.
METHODS: Retrospective chart review.
METHODS: Quaternary academic children\'s hospital.
METHODS: Patients aged <18 years with congenital heart disease undergoing aspiration thrombectomy between November 2017 and February 2022.
RESULTS: Thirteen patients underwent mechanical thrombectomy with the Penumbra Indigo System. Their median age was 3.8 years, and median weight was 15.2 kg. Seven patients had palliated single ventricle circulation, and 6 had biventricular circulation. Nine patients had intensive care unit (ICU) admission before the procedure, and 12 required ICU admission after the procedure. Indications for thrombectomy included systemic venous thrombus in 7 patients, pulmonary arterial thrombus in 3 patients, systemic arterial thrombus in 2 patients, and systemic-to-pulmonary shunt occlusion in 1 patient. The median estimated blood loss was 7.7 mL/kg (interquartile range [IQR], 1.4-15.8 mL/kg; range, 0.5-51.5 mL/kg). Seven patients required intraoperative transfusion of packed red blood cells (n = 4), fresh frozen plasma (n = 2), platelets (n = 3), and/or cryoprecipitate (n = 1). In the patients requiring transfusion, the median transfusion volume was 22 mL/kg (IQR, 14.1-59.7 mL/kg, 9.3-132.8 mL/kg). Thrombectomy was successful in 8 of 13 patients, although 3 of these 8 patients experienced recurrent thrombosis.
CONCLUSIONS: Mechanical aspiration thrombectomy is being increasingly used to treat critically ill pediatric patients and presents unique anesthetic considerations, particularly related to the need for volume and blood product resuscitation.

OBJECTIVE: Anemia is common in locally advanced cervical cancer. Clinical practice varies greatly for management of anemia during brachytherapy, with some centres providing red cell transfusion to increase hemoglobin levels above 100 g/L.
METHODS: This is a retrospective observational cohort study of adult patients with cervical cancer treated with brachytherapy at two academic hospitals. One hospital (H1) uses a liberal transfusion strategy with hemoglobin threshold of 100 g/L during brachytherapy and the other uses a restrictive target of 70 g/L (H2).
RESULTS: Overall, 336 patients met inclusion criteria (H1: 150 patients, H2: 186 patients). 11 patients were excluded (2 at H1, 9 at H2). Demographics at both sites were comparable, except for cancer stage and smoking history. External beam radiation and chemotherapy provided was similar. Hemoglobin values were compared at baseline (within 4 weeks of oncology consult), and prior to the first and second brachytherapy treatments. In total, 101red blood cell (RBC) units were transfused to patients at H1 and 19 units to patients at H2. Patients were followed for a median of 37.0 months (0.6-80.5) at H1, and 33.3 months (1.6-82.0) at H2. There was no significant difference in progression-free or overall survival. Multivariable logistic regression analysis showed that FIGO stage was a predictor for both overall survival and cancer progression. Age, tumor size, chemotherapy, and hemoglobin levels were not predictors of disease progression or mortality.
CONCLUSIONS: The practice of liberal transfusion should be re-evaluated in the absence of robust data to support its use.