Purpose of reviewSevere bleeding events, which require blood transfusions, are a challenge faced by many critical care physicians on a daily basis. Current transfusion guidelines generally recommend rather strict transfusion thresholds and strategies, which can appear opposing to a patient in need for urgent transfusion at first sight. Moreover, applied guidelines are lacking evidence and specificity for the typical ICU patient population and its comorbidities. Transfusion decisions, which are pivotal for clinical outcome, are often unsatisfactorily based on hemoglobin levels only. Recent findingsRecent publications generally support previous studies that a strict transfusion regimen is superior to a liberal one for the majority of cases. Newly developed and easily feasible techniques are currently in clinical trials and have the potential to become a valuable supplementation to hemoglobin-guided decisionmaking. In addition to the choice of the ideal transfusion strategy, physiological status and comorbidities were found to have a major impact on the outcome of severe bleedings in the ICU.
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