Blood transfusion in critically injured patients: a prospective study

Does autotransfusion from a contaminated trauma laparotomy field increase the risk of complications?

BACKGROUND

Autotransfusion (AT) in trauma laparotomy is limited by concern that enteric contamination (EC) increases complications, including infections. Our goal was to determine if AT use increases complications in trauma patients undergoing laparotomy with EC.

METHODS

Trauma patients undergoing laparotomy from October 2011-November 2020 were reviewed. Patients were excluded if they did not receive blood in the operating room, did not have a full thickness hollow viscus injury, or died <24 h from admission. AT and non-AT patients were matched. Outcomes were compared.

RESULTS

185 patients were included, 60 received AT, and 46 pairs were matched. After matching, demographics were similar. No differences were noted in septic complications (33 vs 41%, p = 0.39), overall complications (59% vs 54%, p = 0.67), or mortality (13 vs 6%, p = 0.29).

CONCLUSIONS

AT use in contaminated trauma laparotomy fields was not associated with a higher rate of complications.

The dose-dependent relationship between blood transfusions and infections after trauma: A population-based study

OBJECTIVE

The relationship between total transfusion volume and infection in the trauma patient remains unclear, especially at lower volumes of transfusion. We sought to quantify the cumulative, independent impact of transfusion within 24 hours of admission on the risk of infection in trauma patients.

METHODS

Using the Trauma Quality Improvement Program 2013 to 2016 database, we included all patients who received blood transfusions in the first 4 hours. Patients who were transferred or had incomplete/wrongly coded information on transfusion volume were excluded. Patients were divided into 20 cohorts based on the total blood product volume transfused in the first 24 hours. A composite infection variable (INF) was created, including surgical site infection, ventilator-associated pneumonia, urinary tract infection, central line associated blood stream infection, and sepsis. Univariate and stepwise multivariable logistic regression analyses were performed to study the relationship between blood transfusion and INF, controlling for demographics (e.g., age, sex), comorbidities (e.g., cirrhosis, diabetes, steroid use), severity of injury (e.g., vital signs on arrival, mechanism, Injury Severity Score), and operative and angiographic interventions.

RESULTS

Of 1,002,595 patients, 37,568 were included. The mean age was 42 ± 18.6 years, 74.6% were males, 68% had blunt trauma, and median Injury Severity Score was 25 [17-34]. Adjusting for all available confounders, odds of INF increased incrementally from 1.00 (reference, 0-2 units) to 1.23 (95% confidence interval, 1.11-1.37) for 4 units transfused to 4.89 (95% confidence interval, 2.72-8.80) for 40 units transfused. Each additional unit increased the odds of INF by 7.6%.

CONCLUSION

Transfusion of the bleeding trauma patient was associated with a dose-dependent increased risk of infectious complications. Trauma surgeons and anesthesiologists should resuscitate the trauma patient until prompt hemorrhage control while avoiding overtransfusion.

LEVEL OF EVIDENCE

Retrospective cohort study, Therapeutic IV.

When Enough is Enough: Impact of Packed Red Blood Cells in Massive Transfusion Outcomes

Massive transfusion protocol (MTP) with fresh-frozen plasma and packed red blood cells (PRBCs) in a 1:1 ratio is one of the most common resuscitative strategies used in patients with severe hemorrhage. There are no studies to date that examine the best postoperative hematocrit range as a marker for survival after MTP. We hypothesize a postoperative hematocrit dose-dependent survival benefit in patients receiving MTP. This was a 53-month retrospective analysis of patients with intra-abdominal injuries requiring surgery and transfusion of 10 units PRBCs or more at a single Level I trauma center. Groups were defined by postoperative hematocrit (less than 21, 21 to 29, 29.1 to 39, and 39 or more). Kaplan-Meier (KM) survival probability was calculated. One hundred fifty patients requiring operative abdominal explorations and 10 units PRBCs or more were identified. There were no significant differences in demographics between groups. When comparing postoperative hematocrit groups, relative to a hematocrit of less than 21 per cent in KM survival analysis, an overall survival advantage was only evident in patients transfused to hematocrits 29.1 to 39 per cent ( P < 0.03; odds ratio [OR], 0.284; 95% confidence interval [CI], 0.089 to 0.914). This survival advantage was not seen in the other groups (21 to 29: OR, 0.352; 95% CI, 0.103 to 1.195 or 39% or greater: OR, 0.107; 95% CI, 0.010 to 1.121). This is the first study to examine the impact of postoperative hematocrit as an indicator of survival after MTP in the trauma patient. Transfusion to hematocrits between 29.1 and 39 per cent conveyed a survival benefit, whereas resuscitation to supraphysiologic hematocrits 39 per cent or greater conveyed no additional survival benefit. This study highlights the need for judicious PRBC administration during MTP and its potential impact on survival in patients with postoperative supraphysiologic hematocrits.

The impact of hypothermia on outcomes in massively transfused patients

BACKGROUND

Hypothermia is associated with poor outcomes after injury. The relationship between hypothermia during contemporary large volume resuscitation and blood product consumption is unknown. We evaluated this association, and the predictive value of hypothermia on mortality.

METHODS

Patients predicted to receive massive transfusion at 12 level 1 trauma centers were randomized in the Pragmatic Randomized Optimal Platelet and Plasma Ratios (PROPPR) trial and were grouped into those who were hypothermic (<36°C) or normothermic (36-38.5°C) within the first 6 hours of emergency department arrival. The impact of hypothermia or normothermia on the volume of blood product required during the first 24 hours was determined via negative binomial regression, adjusting for treatment arm, injury severity score, mechanism, demographics, pre-emergency department fluid volume, blood administered before becoming hypothermic, pulse and systolic blood pressure on arrival, and the time exposed to hypothermic or normothermic temperatures.

RESULTS

Of 680 patients, 590 had a temperature measured during the first 6 hours in hospital, and 399 experienced hypothermia. The mean number of red blood cell (RBC) units given to all patients in the first 24 hours of admission was 8.8 (95% confidence interval [CI], 7.9-9.6). In multivariable analysis, every 1°C decrease in temperature below 36.0°C was associated with a 10% increase (incidence rate ratio, 0.90; 95% CI, 0.89-0.92; p < 0.00) in consumption of RBCs during the first 24 hours of admission. There was no association between RBC administration and a temperature above 36°C. Hypothermia on arrival was an independent predictor of mortality, with an adjusted odds ratio of 2.7 (95% CI, 1.7-4.5; p < 0.00) for 24-hour mortality and 1.8 (95% CI, 1.3-2.4; p < 0.00) for 30-day mortality.

CONCLUSION

Hypothermia is associated with increase in blood product consumption and mortality. These findings support the maintenance of normothermia in trauma patients and suggest that further investigation on the impact of cooling or rewarming during massive transfusion is warranted.

LEVEL OF EVIDENCE

Prognostic, level III.

Fresh frozen plasma is permissive for systemic inflammatory response syndrome, infection, and sepsis in multiple-injured patients

BACKGROUND

The correction of coagulopathy with fresh frozen plasma (FFP) is one of the main issues in the treatment of multiple-injured patients. Infectious and septic complications contribute to an adverse outcome in multiple-injured patients. Here, we investigated the role of FFP in the development of inflammatory complications given within the first 48 hours.

METHODS

A total of 2033 patients with multiple injuries and an Injury Severity Score greater than 16 points and aged 16 years or older were included. The population was subdivided into 2 groups: those who received FFP and those who did not. The data were analyzed using SPSS version 22.0. Associations between the data were tested using Pearson correlation. Independent predictivity was analyzed by binary logistic regression and multivariate regression. Data were considered as significant if P<.05.

RESULTS

The prothrombin time at admission was significantly lower (68.5%±23.3% vs 81.8%±21.0% normal; P<.001) in the group receiving FFP. The application of FFP led to a more severe systemic inflammatory response syndrome (SIRS) grade (3.0±1.2 vs 2.2±1.4; P<.001), to a higher infection rate (48% vs 28%; P<.001), and to a higher sepsis rate (29% vs 13%; P<.001) in the patients receiving FFP. The correlations between SIRS and the incidence of infections and sepsis increased with the amount of FFP applied (P<.001).

CONCLUSIONS

Treatment with FFP of bleeding patients with multiple injuries enhances the risk of SIRS, infection, and sepsis; however, a multifactorial genesis has to be postulated.

Preoperative anemia, blood transfusion, and neutrophil-to-lymphocyte ratio in patients with stage i non-small cell lung cancer

Perioperative and postoperative blood transfusions (BT), anemia and inflammation are associated with poor survivals in patients with non-small cell lung cancer (NSCLC). This study investigated the impact of perioperative BT on the survival of patients with NSCLC taking into account their preoperative inflammatory status and the presence of anemia. Demographic, perioperative, and survival data for 861 patients with stage I NSCLC was collected retrospectively. The primary endpoints of interest were recurrence-free (RFS) and overall survival (OS). Before and after propensity score matching, univariate and multivariable Cox proportional hazards models were used to evaluate the association between covariates and survival. A neutrophil-to-lymphocyte ratio (NLR) < 5 (hazard ratio [HR]: 0.58, 95% CI: 0.38-0.87; p = 0.009) and normal Hb concentration (HR: 0.72, 95% CI: 0.72; p = 0.022) were independently associated with longer RFS. The administration of blood perioperatively was associated with a trend towards worse RFS (HR: 0.69, 95% CI: 0.47-1.02; p = 0.066). The multivariate analysis also revealed that an NLR < 5 (HR: 0.48, 95% CI: 0.3-0.76; p = 0.001) and the absence of BT (HR: 0.63, 95% CI: 0.4-0.98; p = 0.04) were significantly associated with lower mortality risk. The propensity score matching analysis did not confirm the association between BT and poor RFS (HR: 0.63, 95% CI: 0.35-1.1; p = 0.108) and OS (HR: 0.52, 95% CI: 0.26-1.04; p = 0.06). Inflammation and anemia are common finding in patients with stage 1 NSCLC. After adjusting for these two important confounders, this study confirms that previous reports demonstrating an association between BT and poor survival after NSCLC surgery.

Protocols for massive blood transfusion: when and why, and potential complications

PURPOSE

An update paper on massive bleeding after major trauma. A review of protocols to address massive bleeding, and its possible complications, including coagulation abnormalities, complications related to blood storage, immunosuppression and infection, lung injury associated with transfusion, and hypothermia is carried out.

METHODS

Literature review and discussion with authors' experience.

RESULTS

Massive bleeding is an acute life-threatening complication of major trauma, and consequently its prompt diagnosis and treatment is of overwhelming importance. Treatment requires rapid surgical management together with the massive infusion of colloid and blood.

CONCLUSIONS

Since massive transfusion provokes further problems in patients who are already severely traumatized and anaemic, once this course of action has been decided upon, a profound knowledge of its potential complications, careful monitoring and proper follow-up are all essential. To diagnose this bleeding, most authors favour, as the main first choice tool, a full-body CT scan (head to pelvis), in non-critical severe trauma cases. In addition, focused abdominal sonography for trauma (FAST, an acronym that highlights the necessity of rapid performance) is a very important diagnostic test for abdominal and thoracic bleeding. Furthermore, urgent surgical intervention should be undertaken for patients with significant free intraabdominal fluid and haemodynamic instability. Although the clinical situation and the blood haemoglobin concentration are the key factors considered in this rapid decision-making context, laboratory markers should not be based on a single haematocrit value, as its sensitivity to significant bleeding may be very low. Serum lactate and base deficit are very sensitive markers for detecting and monitoring the extent of bleeding and shock, in conjunction with repeated combined measurements of prothrombin time, activated partial thromboplastin time, fibrinogen and platelets.

Risk factors for sepsis in Korean trauma patients

PURPOSE

Sepsis in severely injured patients is one of the leading causes of death in hospitals. The incidence of and risk factors for sepsis after trauma have been studied outside, but not within Korea. Therefore, this study investigated the incidence of sepsis and the independent risk factors for sepsis in moderately to severely injured patients in Korea.

METHODS

The electronic medical records of patients who visited the emergency department from January 2010 to December 2012 were reviewed retrospectively. Patients older than 18 years of age with an Injury Severity Score (ISS) greater than or equal to nine points were included.

RESULTS

A total of 183 patients met the study inclusion criteria. The median ISS was 14 (range 9-17) points and 15 (8 %) patients developed sepsis. The patients' age [adjusted OR, 1.053; 95 % confidence intervals (CI), 1.015-1.094], ISS (adjusted OR, 1.114; 95 % CI, 1.046-1.187), and emergency surgery (adjusted OR, 3.727; 95 % CI, 1.051-13.221) were independent risk factors for post-traumatic sepsis.

CONCLUSIONS

Among the risk factors identified in the literature, our research confirmed only the patients' age and ISS as risk factors for sepsis after trauma, and, additionally, identified emergency surgery as a risk factor in Korean patients. Therefore, trauma patients who have any of the risk factors mentioned above have a high risk of post-traumatic sepsis, which requires certain precautionary clinical measures.

Citrate modulates lipopolysaccharide-induced monocyte inflammatory responses

Citrate, a central component of cellular metabolism, is a widely used anti-coagulant due to its ability to chelate calcium. Adenosine triphosphate (ATP)-citrate lyase, which metabolizes citrate, has been shown to be essential for inflammation, but the ability of exogenous citrate to impact inflammatory signalling cascades remains largely unknown. We hypothesized that citrate would modulate inflammatory responses as both a cellular metabolite and calcium chelator, and tested this hypothesis by determining how clinically relevant levels of citrate modulate monocyte proinflammatory responses to lipopolysaccharide (LPS) in a human acute monocytic leukaemia cell line (THP-1). In normal medium (0.4 mM calcium), citrate inhibited LPS-induced tumour necrosis factor (TNF)-α and interleukin (IL)-8 transcripts, whereas in medium supplemented with calcium (1.4 mM), TNF-α and IL-8 levels increased and appeared independent of calcium chelation. Using an IL-8-luciferase plasmid construct, the same increased response was observed in the activation of the IL-8 promoter region, suggesting transcriptional regulation. Tricarballylic acid, an inhibitor of ATP-citrate lyase, blocked the ability of citrate to augment TNF-α, linking citrate's augmentation effect with its metabolism by ATP-citrate lyase. In the presence of citrate, increased histone acetylation was observed in the TNF-α and IL-8 promoter regions of THP-1 cells. We observed that citrate can both augment and inhibit proinflammatory cytokine production via modulation of inflammatory gene transactivation. These findings suggest that citrate anti-coagulation may alter immune function through complex interactions with the inflammatory response.

Intensive red blood cell transfusions and risk of alloimmunization

BACKGROUND

Exposure to allogenic red blood cells (RBCs) may lead to formation of antibodies against nonself-antigens in transfused patients. While alloimmunization rates are known to increase with the number of transfusions, the transfusion course in patients can vary from receiving multiple units during a single transfusion event or getting them dispersed over a long(er) period. In this study we compared the immunization risk between different transfusion intensities.

STUDY DESIGN AND METHODS

An incident new-user cohort study was conducted among consecutive transfused patients at two university medical centers. All patients who received their first RBC transfusion within the study period from January 2005 to December 2011 were eligible. Intensive transfusions were defined as at least 5, at least 10, and at least 20 RBC units within 48 hours. Alloimmunization hazard ratios (HRs), comparing patients receiving intensive transfusions to patients never receiving intensive transfusions, were estimated.

RESULTS

The study cohort was composed of 5812 patients who had received a median of 7 (interquartile range, 4-12) units. RBC alloantibodies were formed by 156 patients. The adjusted Cox regression HRs for alloimmunization, with number of units as the time covariate and adjusted for patient age, sex, and follow-up time after first transfusion, ranged from 0.8 to 1.2 (95% confidence interval, 0.4-2.6).

CONCLUSION

The occurrence of RBC alloimmunization in patients receiving intensive transfusions did not differ significantly from patients receiving nonintensive transfusions.

Emergency department blood transfusion: the first two units are free

INTRODUCTION

Studies on blood product transfusions after trauma recommend targeting specific ratios to reduce mortality. Although crystalloid volumes as little as 1.5 L predict increased mortality after trauma, little data is available regarding the threshold of red blood cell (RBC) transfusion volume that predicts increased mortality.

MATERIALS AND METHODS

Data from a level I trauma center between January 2000 and December 2008 were reviewed. Trauma patients who received at least 100 mL RBC in the emergency department (ED) were included. Each unit of RBC was defined as 300 mL. Demographics, RBC transfusion volume, and mortality were analyzed in the nonelderly (<70 y) and elderly (≥70 y). Multivariate logistic regression was performed at various volume cutoffs to determine whether there was a threshold transfusion volume that independently predicted mortality.

RESULTS

A total of 560 patients received ≥100 mL RBC in the ED. Overall mortality was 24.3%, with 22.5% (104 deaths) in the nonelderly and 32.7% (32 deaths) in the elderly. Multivariate logistic regression demonstrated that RBC transfusion of ≥900 mL was associated with increased mortality in both the nonelderly (adjusted odds ratio 2.06, P = 0.008) and elderly (adjusted odds ratio 5.08, P = 0.006).

CONCLUSIONS

Although transfusion of greater than 2 units in the ED was an independent predictor of mortality, transfusion of 2 units or less was not. Interestingly, unlike crystalloid volume, stepwise increases in blood volume were not associated with stepwise increases in mortality. The underlying etiology for mortality discrepancies, such as transfusion ratios, hypothermia, or immunosuppression, needs to be better delineated.

Acute coagulopathy and early deaths post major trauma

INTRODUCTION AND AIMS

Acute traumatic coagulopathy is observed in 10-25% of patients post major trauma and its management forms an integral part of haemostatic resuscitation. The identification and treatment of this coagulopathy is difficult and there is uncertainty regarding optimal therapeutic guidelines during the early phases of trauma resuscitation. This study aimed to examine the association between acute coagulopathy and early deaths post major trauma.

METHODS

A retrospective review of data over a 5 year period was performed to determine the associations between variables considered to contribute to mortality for adult major trauma patients (Injury Severity Score (ISS)>15) receiving blood transfusions as part of their initial resuscitation. Early death, defined as death in ED, or death in the operating theatre (OT), Intensive Care Unit (ICU) or wards within 24 h of admission was the primary end-point. Patients with non-survivable head injury on initial imaging were excluded. Univariate associations were calculated and multivariable logistic regression analysis was used to determine independent associations with mortality.

RESULTS

There were 772 patients included in this study with a median ISS of 29 (19-41), with 91.7% blunt trauma. All-cause in-hospital mortality was 17.5%, while 77 (9.7%) patients died early. Increasing age (OR 1.04), a GCS of 3-8 (OR 5.05), and the presence of acute coagulopathy (OR 8.77) were significant independent variables associated with early death.

CONCLUSIONS

Acute traumatic coagulopathy, independent of injury severity, transfusion practice or other physiological markers for haemorrhage, was associated with early death in major trauma patients requiring a blood transfusion. Early recognition and management of coagulopathy, independent of massive transfusion guidelines, may improve outcome from trauma resuscitation. Further studies are required for the early recognition of acute traumatic coagulopathy to enable the development of an evidence base for management.

Epidemiology and risk factors of sepsis after multiple trauma: an analysis of 29,829 patients from the Trauma Registry of the German Society for Trauma Surgery

OBJECTIVES

The objectives of this study were 1) to assess potential changes in the incidence and outcome of sepsis after multiple trauma in Germany between 1993 and 2008 and 2) to evaluate independent risk factors for posttraumatic sepsis.

DESIGN

Retrospective analysis of a nationwide, population-based prospective database, the Trauma Registry of the German Society for Trauma Surgery.

SETTING

A total of 166 voluntarily participating trauma centers (levels I-III).

PATIENTS

Patients registered in the Trauma Registry of the German Society for Trauma Surgery between 1993 and 2008 with complete data sets who presented with a relevant trauma load (Injury Severity Score of ≥ 9) and were admitted to an intensive care unit (n = 29,829).

INTERVENTIONS

None.

MEASUREMENTS AND MAIN RESULTS

Over the 16-yr study period, 10.2% (3,042 of 29,829) of multiply injured patients developed sepsis during their hospital course. Annual data were summarized into four subperiods: 1993-1996, 1997-2000, 2001-2004, and 2005-2008. The incidences of sepsis for the four subperiods were 14.8%, 12.5%, 9.4%, and 9.7% (p < .0001), respectively. In-hospital mortality for all trauma patients decreased for the respective subperiods (16.9%, 16.0%, 13.7%, and 11.9%; p < .0001). For the subgroup of patients with sepsis, the mortality rates were 16.2%, 21.5%, 22.0%, and 18.2% (p = .054), respectively. The following independent risk factors for posttraumatic sepsis were calculated from a multivariate logistic regression analysis: male gender, age, preexisting medical condition, Glasgow Coma Scale score of ≤ 8 at scene, Injury Severity Score, Abbreviated Injury ScaleTHORAX score of ≥ 3, number of injuries, number of red blood cell units transfused, number of operative procedures, and laparotomy.

CONCLUSIONS

The incidence of sepsis decreased significantly over the study period; however, in this decade the incidence remained unchanged. Although overall mortality from multiple trauma has declined significantly since 1993, there has been no significant decrease of mortality in the subgroup of septic trauma patients. Thus, sepsis has remained a challenging complication after trauma during the past 2 decades. Recognition of the identified risk factors may guide early diagnostic workup and help to reduce septic complications after multiple trauma.

Risk of cardiac arrhythmias and conduction abnormalities in patients with acute myocardial infarction receiving packed red blood cell transfusions

PURPOSE

Although transfusion has been linked to the development of atrial fibrillation (AF) in cardiac surgical patients, this association has not been investigated in patients with acute myocardial infarction (AMI). Evidence supports an inflammatory mechanism in the development of AF, and red cell transfusions also elicit an inflammatory response. We therefore sought to evaluate whether packed red blood cell transfusion increases the risk of AF, ventricular tachycardia (VT), and other arrhythmias and conduction abnormalities in patients with AMI.

MATERIALS AND METHODS

This is a retrospective study on patients with AMI and no prior history of AF, admitted to a critical care area and entered in Project Impact database from 08/2003-12/2007. Primary outcome measures were new-onset cardiac arrhythmias or conduction disturbances.

RESULTS

Transfused patients had significantly higher incidences of AF (4.7% vs 1.3%, P = .008), cardiac arrest (9.5% vs 1.7%, P < .001) and heart block (3.4% vs 0.1%, P < .001), and a trend toward a higher incidence of VT (3.4% vs 1.3%, P = .058). Multivariate regression analysis confirmed transfusion as an independent risk factor for "non-lethal" cardiac events (AF/heart block; odds ratio [OR], 4.7 [1.9-11.9]; P = .001), "lethal" events (VT/cardiac arrest; OR, 2.4 [1.1-5]; P = .016), and all cardiac events (OR, 2.8 [1.5-65.1]; P = .001). Transfused patients had significantly longer length of stay (P < .0001) and significantly higher mortality rates than nontransfused patients (OR, 3 [1.7-5.5]; P < .001).

CONCLUSIONS

Packed red blood cell transfusion is independently associated with an increased risk of new-onset cardiac arrhythmias and conduction abnormalities in the setting of AMI, even after controlling for traditional risk factors.

Complications of massive transfusion

Massive transfusion (MT) is a lifesaving treatment of hemorrhagic shock, but can be associated with significant complications. The lethal triad of acidosis, hypothermia, and coagulopathy associated with MT is associated with a high mortality rate. Other complications include hypothermia, acid/base derangements, electrolyte abnormalities (hypocalcemia, hypomagnesemia, hypokalemia, hyperkalemia), citrate toxicity, and transfusion-associated acute lung injury. Blood transfusion in trauma, surgery, and critical care has been identified as an independent predictor of multiple organ failure, systemic inflammatory response syndrome, increased infection, and increased mortality in multiple studies. Once definitive control of hemorrhage has been established, a restrictive approach to blood transfusion should be implemented to minimize further complications.

[Prognostic factors in chest traumas: a prospective study of 500 patients]

OBJECTIVE

Identify the factors of greatest impact in patients with chest trauma.

PATIENTS AND METHODS

prospective study of 500 patients (425 men and 75 women) with chest trauma treated between January 2006 and December 2008. The parameters assessed include the degree of trauma, the abbreviated injury scale (AIS), the injury severity score (ISS), pre-hospital intubation, duration of mechanical ventilation, stay in the intensive care unit (ICU), number of rib fractures, presence of pulmonary contusion, haemothorax and cardio-pulmonary effects.

RESULTS

The presence of polytrauma, the number of rib fractures, the presence of flail chest, pulmonary contusion, the delay in mechanical ventilation and age were shown to be effective markers of severity.

CONCLUSIONS

Thoracic injuries have a number of indicators of severity. The mortality risk is associated with an ISS >25, the presence of 3 or more rib fractures with flail chest, pulmonary contusion, the development of ARDS, and with an age >55 years.

Changes in transfusion practice in multiple injury between 1993 and 2006: a retrospective analysis on 5389 patients from the German Trauma Registry

To evaluate transfusion practices in multiple injured patients and to demonstrate changes in the pattern of packed red blood cell (pRBC) transfusions over the last one-and-half decade (1993-2006). A retrospective analysis using the German Trauma Registry database (DGU-Traumaregister) including 29 353 multiple injured patients was conducted. The study population included primary admissions presenting to the emergency room (ER) with clinical and laboratory signs of active haemorrhage [haemoglobin < 9 g x dL(-1), platelets < 90000 xmicroL(-1) and prothrombin time (Quick-value) < 60%]. The pattern of pRBC transfusions was followed from ER to intensive care unit (ICU) admission. A total of 5389 patients with complete data sets were divided into the following three groups according to the year of treatment and analysed: (a) group 1: 1993-1998 (n = 870), (b) group 2: 1999-2002 (n = 2044) and (c) group 3: 2003-2006 (n = 2475). Patients had a mean age of 40.5 (+/-20) years and were predominantly male (67.2%). All patients were substantially injured (mean injury severity score = 32 +/- 15.5) and in 93% the mechanism of injury was blunt. The percentage of patients who received pRBC transfusions between ER and ICU dropped from 72% in 1993-1998 to 54% in 2003-2006 (P < 0.005). Similarly, the percentage of patients receiving mass transfusions (> 10 pRBC units) dropped from 51.3 to 17.1%. This decline was accompanied by lower incidence rates for septic complications, ventilator days, ICU length-of-stay and mortality. pRBC transfusion practices in acute trauma care have changed substantially over the last one-and-half decade and were associated with better outcome.

The Severity of Injury and the Extent of Hemorrhagic Shock Predict the Incidence of Infectious Complications in Trauma Patients

BACKGROUND

Trauma patients are at high risk of developing systemic inflammatory response syndrome (SIRS) and infections. The aim of this study was to evaluate the influence of the severity of injury and the extent of hemorrhagic shock at admission on the incidence of SIRS, infection and septic complications.

METHODS

A total of 972 patients who had an injury severity score (ISS) of ≥ 17, survived more than 72 h, and were admitted to a level I trauma center within 24 h after trauma were included in this retrospective analysis. SIRS, sepsis and infection rates were measured in patientswith different severities of injury as assessed by ISS, or with various degrees of hemorrhagic shock according to ATLS(®) guidelines, andwere compared using both uni- and multivariate analysis.

RESULTS

Infection rates and septic complications increase significantly (p < 0.001) with higher ISS. Severe hemorrhagic shock on admission is associated with a higher rate of infection (72.8%) and septic complications (43.2%) compared to mild hemorrhagic shock (43.4%, p < 0.001 and 21.7%, p < 0.001, respectively).

CONCLUSION

The severity of injury and the severity of hemorrhagic shock are risk factors for infectious and septic complications. Early diagnostic and adequate therapeutic work up with planned early "second look" interventions in such high-risk patients may help to reduce these common posttraumatic complications.

The role of erythropoietin in the acute phase of trauma management: evidence today

Trauma patients often present in a state of haemorrhagic shock. Blood products remain the gold standard of resuscitation, but allogeneic blood transfusions (ABTs) are associated with several risks. The stimulating effect of recombinant-erythropoietin (EPO-A) on erythropoiesis has raised interest in its administration as an alternative. The existing evidence on the early use of EPO-A in the acute phase of trauma patients management consists of only 14 publications. The level of evidence of these studies and the number of treated patients was not found to be adequate to support its generalised use, despite their favourable results. Its safety profile, the preliminary proofs of its efficacy, and the additional cyto-protective properties of EPO-A strongly encourage further controlled studies assessing its use in the acute setting of initial trauma management.

Blood Transfusions in Trauma: Six-Year Analysis of the Transfusion Practices at a Level I Trauma Center

The objective of this study was to analyze the transfusion practices in trauma patients in one institution. A retrospective analysis of the Trauma Registry linked with the Blood Bank Database of a Level 1 trauma center was conducted. Over 6 years, 17 per cent of the 25,599 trauma patients received blood transfusions. The overall mortality in transfused patients was 20 per cent and remained the same during the study period. There was no change in the proportion of patients receiving transfusions throughout the years, however there was a significant 23.5 per cent reduction in the mean number of packed red blood cells (PRBC) units transfused (P < 0.001 for trend). This reduction in PRBC used remained true and even more evident in the group of more severely injured patients (Injury Severity Score ≥ 16), with a 27.9 per cent decrease in mean units of PRBC (P < 0.001 for trend). The highest reduction in PRBC transfusion was seen in blunt trauma patients (34.6%, P < 0.001). During the study period there was a concurrent increase in mean units of fresh frozen plasma used (60.7%, P < 0.001) and no change in the use of platelets and cryoprecipitate. In conclusion, transfusions of PRBC were significantly reduced over time in trauma patients without any evident negative impact on mortality.

Update on Transfusion Medicine

Clinical pharmacists often participate on critical care teams that manage patients with bleeding emergencies. Although blood products are usually dispensed from the blood bank and not the pharmacy, pharmacists should be conversant in the language and trends of transfusion medicine, much like they are with other therapeutic agents. Toward that goal, this review provides a concise transfusion medicine tutorial, covering all commonly used blood products, including red blood cells, platelets, fresh frozen plasma, and plasma derivatives such as cryoprecipitate, prothrombin complex concentrates, and albumin. Usage patterns, the rationale for administering the various blood products, and studies that have attempted to determine appropriate criteria for ordering transfusions (transfusion triggers) are discussed. The benefits, risks, and several ongoing controversies that relate to the appropriateness and safety of blood product use are also summarized.

Massive blood transfusion and trauma resuscitation

AIMS

To review the massive transfusion practice at a Level I adult Trauma Centre during initial trauma reception and resuscitation.

METHODS

All trauma patients presenting to The Alfred Emergency & Trauma Centre and receiving a transfusion of five units or more of packed red blood cells within 4h of presentation over a 26-month period were included in this study. Patient demographics, clinical characteristics, injuries, surgical management and volume of blood transfused were analysed with mortality as the primary endpoint. Initial clinical features and injuries predictive of massive transfusion were also analysed.

RESULTS

There were 119 patients who received a transfusion of five units or more of packed red blood cells (PRBCs) within 4h of presentation. The median Injury Severity Score of this group of patients was 34.0 (IQR 26-48) and mortality was 27.7%. The median number of packed red blood cell transfused was 8.0 (IQR 6-14) in the 1st 4h. Initial clinical features and injuries independently associated with a larger volume of blood transfused were initial hypotension, fractures of the pelvis, kidney injuries, initial acidaemia, and thrombocytopaenia. The Injury Severity Score, initial coagulopathy measured by APTT and the presence of head injuries were the independent predictors of mortality.

CONCLUSIONS

The volume of blood transfused during trauma resuscitation was not found to be an independent predictor of mortality. Prospective studies into transfusion practice and clinical features of patients during the trauma resuscitation phase requiring massive transfusion are needed to establish evidence-based guidelines for massive transfusion.