Posttraumatic Acute Respiratory Distress Syndrome Research Articles

Comparative Study between the use of Ultrasonic Criteria of Weaning versus the Conventional Criteria of Weaning in Post-traumatic Acute Respiratory Distress Syndrome Patients who were Ventilated for a long Time

Introduction: Failure to wean and re-ventilation is a major problem in the intensive care unit (ICU). Thirty percent of ventilated patients experience weaning failure and are re-ventilated, especially patients who are ventilated for long durations. Ultrasound provides reliable data on lung parenchyma inflammation resolution and diaphragmatic contraction power, thereby assisting in deciding if the patient should be weaned and consequently reducing the percentage of weaning failure. Aim of the Work: To compare the ultrasonic criteria for weaning with the conventional criteria of weaning in patients with post-traumatic acute respiratory distress syndrome (ARDS) who were ventilated for a long time and assess their effect on the ICU stay duration. Materials and Methods: This was a prospective, double-blind study performed on 200 participants who were weaned from the ventilator after being ventilated for > 1 week due to respiratory failure. Respiratory failure in the patients was either due to severe lung contusion or post-traumatic ARDS. The patients were randomly and equally allocated in two groups of 100 patients each. Groups A and B comprised patients who were weaned from the ventilator using the conventional and ultrasound weaning criteria, respectively. All patients weaned from both groups were followed up for 6 days for signs of weaning failure and post-extubation respiratory failure. The number of patients who were re-ventilated and discharged from the ICU was recorded and compared in both groups. Results: Group A had a significantly higher number of patients who experienced deterioration in consciousness, tachypnea, desaturation, tachycardia, and hypertension in addition to showing chest X-ray infiltration and being re-ventilated than group B. Moreover, group A patients had a significantly longer ICU duration than group B patients. Conclusion: The use of the ultrasonic criteria for weaning reduces re-intubation, re-ventilation, and post-extubation respiratory failure. Additionally, its use also decreases the ICU stay in patients with post-traumatic ARDS who were ventilated for a long time.

Identification of potential biomarkers and therapeutic targets for posttraumatic acute respiratory distress syndrome

BackgroundDespite improved supportive care, posttraumatic acute respiratory distress syndrome (ARDS) mortality has improved very little in recent years. Additionally, ARDS diagnosis is delayed or missed in many patients. We analyzed co-differentially expressed genes (co-DEGs) to explore the relationships between severe trauma and ARDS to reveal potential biomarkers and therapeutic targets for posttraumatic ARDS.MethodsTwo gene expression datasets (GSE64711 and GSE76293) were downloaded from the Gene Expression Omnibus. The GSE64711 dataset included a subset of 244 severely injured trauma patients and 21 healthy controls. GSE76293 specimens were collected from 12 patients with ARDS who were recruited from trauma intensive care units and 11 age- and sex-matched healthy volunteers. Trauma DEGs and ARDS DEGs were identified using the two datasets. Subsequently, Gene Ontology, Kyoto Encyclopedia of Genes and Genomes, and protein–protein interaction network analyses were performed to elucidate the molecular functions of the DEGs. Then, hub genes of the co-DEGs were identified. Finally, to explore whether posttraumatic ARDS and septic ARDS are common targets, we included a third dataset (GSE100159) for corresponding verification.Results90 genes were upregulated and 48 genes were downregulated in the two datasets and were therefore named co-DEGs. These co-DEGs were significantly involved in multiple inflammation-, immunity- and neutrophil activation-related biological processes. Ten co-upregulated hub genes (GAPDH, MMP8, HGF, MAPK14, LCN2, CD163, ENO1, CD44, ARG1 and GADD45A) and five co-downregulated hub genes (HERC5, IFIT2, IFIT3, RSAD2 and IFIT1) may be considered potential biomarkers and therapeutic targets for posttraumatic ARDS. Through the verification of the third dataset, posttraumatic ARDS may have its own unique targets worthy of further exploration.ConclusionThis exploratory analysis supports a relationship between trauma and ARDS pathophysiology, specifically in relationship to the identified hub genes. These data may serve as potential biomarkers and therapeutic targets for posttraumatic ARDS.

Outcome of post-traumatic acute respiratory distress syndrome in young patients requiring extracorporeal membrane oxygenation (ECMO)

We aimed to evaluate the outcomes of post-traumatic acute respiratory distress syndrome (ARDS) in young patients with and without Extracorporeal membrane oxygenation (ECMO) support. A retrospective analysis was conducted for trauma patients who developed ARDS at a level I trauma facility between 2014 and 2020. Data were analyzed and compared between ECMO and non-ECMO group. We identified 85 patients with ARDS (22 patients had ECMO support and 63 matched patients managed by the conventional mechanical ventilation; 1:3 matching ratio). The two groups were comparable for age, sex, injury severity score, abbreviated injury score, shock index, SOFA score, and head injury. Kaplan Meier survival analysis showed that the survival in the ECMO group was initially close to that of the non-ECMO, however, during follow-up, the survival rate was better in the ECMO group, but did not reach statistical significance (Log-rank, p = 0.43 and Tarone-Ware, p = 0.37). Multivariable logistic regression analysis showed that acute kidney injury (AKI) (Odds ratio 13.03; 95% CI 3.17–53.54) and brain edema (Odds ratio 4.80; 95% CI 1.10–21.03) were independent predictors of mortality. Sub-analysis showed that in patients with severe Murray Lung Injury (MLI) scores, non-ECMO group had higher mortality than the ECMO group (100% vs 36.8%, p = 0.004). Although ARDS is uncommon in young trauma patients, it has a high mortality. ECMO therapy was used in a quarter of ARDS cases. AKI and brain edema were the predictors of mortality among ARDS patients. ECMO use did not worsen the outcome in trauma patients; however, the survival was better in those who had severe MLI and ECMO support. Further prospective study is needed to define the appropriate selection criteria for the use of ECMO to optimize the outcomes in trauma patients.

Outcomes in trauma patients undergoing veno-venous extracorporeal membrane oxygenation for acute respiratory distress syndrome.

The use of veno-venous extracorporeal membrane oxygenation (VV ECMO) remains controversial in trauma patients with acute respiratory distress syndrome (ARDS). Here, we aimed to investigate the therapeutic benefits of VV ECMO and the factors affecting patient outcomes. From 2017 to 2019, 21/1938 trauma patients (median age: 47 years; 18 men) at a level I trauma center received VV ECMO for post-traumatic ARDS. Demographic, injury-specific, ECMO, and outcome data were prospectively collected and retrospectively reviewed to analyze the factors affecting hospital mortality and ECMO results. 19 patients (90.5%) were successfully weaned off ECMO; 16 patients (76.2%) survived to discharge. In univariate analysis, there was a significant difference in survival between the groups with a Trauma and Injury Severity Score (TRISS) ⩾0.5 and TRISS <0.5 (p = 0.05). The area under the receiver operating characteristic curve (AUC) for both TRISS and Respiratory Extracorporeal Membrane Oxygenation Survival Prediction (RESP) scores for death was 0.78. In those who failed ECMO weaning, the AUCs of the TRISS and RESP scores were 0.90 and 0.80, respectively. In patients with ARDS caused by severe trauma and supported by VV ECMO, survival is associated with TRISS; TRISS and RESP scores may be predictive of mortality and failure in ECMO weaning.

Prognostic factors for development of acute respiratory distress syndrome following traumatic injury: a systematic review and meta-analysis.

Our purpose was to summarise the prognostic associations between various clinical risk factors and development of acute respiratory distress syndrome (ARDS) following traumatic injury. We conducted this review in accordance with the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) and CHARMS (Critical Appraisal and Data Extraction for Systematic Reviews of Prediction Modeling Studies) guidelines. We searched six databases from inception through December 2020. We included English language studies describing the clinical risk factors associated with development of post-traumatic ARDS, as defined by either the American-European Consensus Conference or Berlin definition. We pooled adjusted odds ratios for prognostic factors using the random effects method. We assessed risk of bias using the QUIPS (Quality in Prognosis Studies) tool and certainty of findings using GRADE (Grading of Recommendations Assessment, Development and Evaluation) methodology. We included 39 studies involving 5 350 927 patients. We identified the amount of crystalloid resuscitation as a potentially modifiable prognostic factor associated with development of post-traumatic ARDS (adjusted OR 1.19, 95% CI 1.15-1.24 for each additional litre of crystalloid administered within the first 6 h after injury; high certainty). Non-modifiable prognostic factors with a moderate or high certainty of association with post-traumatic ARDS included increasing age, non-Hispanic White race, blunt mechanism of injury, presence of head injury, pulmonary contusion or rib fracture and increasing chest injury severity. We identified one important modifiable factor, the amount of crystalloid resuscitation within the first 24 h of injury, and several non-modifiable factors associated with development of post-traumatic ARDS. This information should support the judicious use of crystalloid resuscitation in trauma patients and may inform development of risk stratification tools.

Association of post-traumatic acute respiratory distress syndrome on poor prognosis: A single-center study.

To determine the association of post-traumatic acute respiratory distress syndrome (ARDS) on poor prognosis, and provide a theoretical basis for the treatment of patients with post-traumatic ARDS in clinical practice. This was a retrospective study including trauma victims in the intensive care unit (ICU) of Daping Hospital. The patients were classified as having ARDS or non-ARDS, according to the Berlin definition. Subsequently, these patients were divided into subgroups, according to age, gender and injury site. The relationship between ARDS and prognosis was analyzed, including mechanical ventilation days, length of ICU stay, length of hospital stay, infection, sepsis, multiple organ dysfunction syndrome (MODS) and death. There were 507 trauma patients, out of which 287 (56.61%) cases were with ARDS. The duration of mechanical ventilation, ICU stay and hospital stay in the ARDS group was significantly longer than that in the non-ARDS group (5 days vs 3 days, 10 days vs 4 days, 30 days vs 27 days, respectively). In addition, ARDS was associated with an increased risk of nfection (p<0.05; OR=4.17; 95%CI=2.72-6.41), sepsis (p<0.05; OR=3.45; 95%CI=2.28-5.22), and MODS (p<0.05; OR=2.82; 95% CI=1.67-4.72), but had no significant association with mortality (p>0.05). Similar results were found in the subgroup analyses. In conclusion, the prognosis of the patients with post-traumatic ARDS was worse; however, ARDS had little effect on death.

Clinical outcomes of extracorporeal membrane oxygenation in acute traumatic lung injury: a retrospective study

BackgroundTherapeutic extracorporeal membrane oxygenation (ECMO) is a challenging procedure in patients who have experienced severe trauma. Particularly, patients with traumatic lung injury and posttraumatic acute respiratory distress syndrome (ARDS) have a high risk of bleeding during this procedure. This study aimed to determine the safety and feasibility of ECMO in patients with traumatic ARDS.MethodsWe retrospectively reviewed medical records and investigated the clinical outcomes of ECMO in 42 patients with traumatic ARDS, among whom near-drowning (42.9%) was the most frequent cause of injury.ResultsThirty-four of 42 patients (81%) survived and were discharged after a median hospital stay of 23 days. A multivariate analysis identified a lactate level (odds ratio: 1.493, 95% confidence interval: 1.060–2.103, P = 0.022) and veno-venous (VV) ECMO (odds ratio: 0.075, 95% confidence interval: 0.006–0.901, P = 0.041) as favorable independent predictors of survival in patients with traumatic ARDS who underwent ECMO. The optimal cut off value for pre-ECMO lactate level was 10.5 mmol/L (area under the curve = 0.929, P = 0.001). In Kaplan-Meier analysis, the survival rate at hospital discharge was significant higher among the patients with a pre-ECMO lactate level of 10.5 mmol/L or less compared with patients with pre-ECMO lactate level greater than 10.5 mmol/L (93.8% versus 40.0%, respectively; P = 0.01).ConclusionsECMO yielded excellent survival outcomes, particularly in patients with low pre-treatment lactate levels who received VV ECMO. Therefore, ECMO appears safe and highly feasible in a carefully selected population of trauma patients.

Mortality of Adult Respiratory Distress Syndrome in Trauma Patients: A Systematic Review over a Period of Four Decades.

Acute respiratory distress syndrome (ARDS) is associated with high morbidity and mortality. In addition, its aetiologies are heterogeneous, and the outcome depends on the underlying cause. In trauma care, changes in diagnostics, management and treatment may influence the outcome of posttraumatic ARDS over time, which are attributable to geographic distribution, relate to the definition used and depend on the injury severity. We selected studies by searching PubMed using the MeSH terms "acute respiratory distress syndrome", "mortality" and "trauma" and all their combinations. Studies that reported mortality rates for polytrauma patients with ARDS were included. We excluded studies with selected population collectives (e.g. burn patients, isolated thoracic trauma and paediatric trauma) and non-trauma studies. Studies were stratified according to the recruitment year of patients into Decade 1 (prior 1990), Decade 2(1990-1999), Decade 3 (2000-2009) and Decade 4 (later 2009); geographic location (North America or Europe), the definition used in the different studies (American European Consensus Conference (AECC) definition or Berlin definition) and the mean injury severity of the patient populations, respectively. Twenty-three studies between 1 January 1980 and 30 June 2018 were included in the analysis (486,861 patients, 52,561 with posttraumatic ARDS). There was a wide variation in mortality rates among the studies (4-39%). The overall pooled mean mortality rate for all studies was 21.8%, SD ± 8.3%. The mean mortality over the last four decades was similar between decade 1 (25.8%), decade 2 (20.6%), decade 3 (20.7%) and decade 4 (22.5%). Geographical observations comparing Europe and North America revealed no difference [Europe (22.1%) and North America (21.7%)]. The ARDS mortality in publications using the Berlin definition (23%) was comparable to the mortality rate in publications using the AECC definition (22.9%). The mortality rate based on the injury severity showed no alteration (ISS ≤ 25 points, 22.6%, ISS > 25 points, 22.6%). In this systematic review, there was no change in the mortality rate over the last four decades, no geographical difference within Western societies, no dependence on the ARDS definition used and no association with injury severity, respectively.

Risk factors affecting post-traumatic acute respiratory distress syndrome development in thoracic trauma patients

This study aims to investigate the risk factors affecting post-traumatic acute respiratory distress syndrome development in thoracic trauma patients. This two-centered, retrospective study included 3,080 thoracic trauma patients (2,562 males, 518 females; mean age 33.9±19.4 years; range, 2 months to 91 years) treated between January 2005 and January 2019. Demographic characteristics, mechanisms of injury, traumatic injuries, injury severity score and new injury severity score results, treatments, comorbidities, complications, morbidity and mortality rates, and durations of hospital stay were collected. Data were used to predict the risk factors for development of post-traumatic acute respiratory distress syndrome by univariate and multivariate statistical analysis. Acute respiratory distress syndrome was detected in 81 patients. In multivariate logistic regression analysis; age, pulmonary contusion, intracranial hemorrhage, rib fracture (unilateral and four-five pieces), femur and tibia fracture, diabetes mellitus, chronic obstructive pulmonary disease, blood transfusion (≥3 units), high white blood cell count at admission, sepsis, and hepatic injury were detected as independent risk factors (p<0.05). Optimal cutoff points (sensitivity/specificity ratios) for acute respiratory distress syndrome development risk were ≥16 (79%/68%) for injury severity score, ≥27 (90%/68.7%) for new injury severity score, and ≥16,000 (75.3%/71.6%) for admission white blood cell count. New injury severity score was superior than injury severity score to predict the development of acute respiratory distress syndrome. Acute respiratory distress syndrome causes significant mortality and morbidity in trauma patients. In addition to the well-known risk factors, diabetes mellitus and chronic obstructive pulmonary disease were independent risk factors. We defined a cutoff value for new injury severity score to predict post-traumatic acute respiratory distress syndrome.

Extracorporeal life support in pediatric trauma: a systematic review

IntroductionExtracorporeal membrane oxygenation (ECMO) was once thought to be contraindicated in trauma patients, however ECMO is now used in adult patients with post-traumatic acute respiratory distress syndrome (ARDS) and multisystem...

Health care utilization and the cost of posttraumatic acute respiratory distress syndrome care.

Posttraumatic acute respiratory distress syndrome (ARDS) is associated with prolonged mechanical ventilation and longer hospitalizations. The relationship between posttraumatic ARDS severity and financial burden has not been previously studied. We hypothesized that increasing ARDS severity is associated with incrementally higher health care costs. Adults arriving as the highest level of trauma activation were enrolled in an ongoing prospective cohort study. Patients who survived 6 hours or longer are included in the analysis. Blinded review of chest radiographs was performed by two independent physicians for any intubated patient with PaO2:FIO2 ratio of 300 mmHg or lower during the first 8 days of admission. The severity of ARDS was classified by the Berlin criteria. Hospital charge data were used to perform standard costing analysis. Acute respiratory distress syndrome occurred in 13% (203 of 1,586). The distribution of disease severity was 33% mild, 42% moderate, and 25% severe. Patients with ARDS were older (41 years vs. 35 years, p < 0.01), had higher median Injury Severity Score (30 vs. 10, p < 0.01), more chest injury (Abbreviated Injury Scale score, ≥ 3: 51% vs. 21%, p < 0.01), and blunt mechanisms (85% vs. 53%, p < 0.01). By ARDS severity, there was no significant difference in age, mechanism, or rate of traumatic brain injury. Increasing ARDS severity was associated with higher Injury Severity Score and higher mortality rates. Standardized total hospital charges were fourfold higher for patients who developed ARDS compared with those who did not develop ARDS (US $434,000 vs. US $96,000; p < 0.01). Furthermore, the daily hospital charges significantly increased across categories of worsening ARDS severity (mild, US $20,451; moderate, US $23,994; severe, US $33,316; p < 0.01). The development of posttraumatic ARDS is associated with higher health care costs. Among trauma patients who develop ARDS, total hospital charges per day increase with worsening severity of disease. Prevention, early recognition, and treatment of ARDS after trauma are potentially important objectives for efforts to control health care costs in this population. Economic and value-based evaluations, level IV.

Incidence of adult respiratory distress syndrome in trauma patients: A systematic review and meta-analysis over a period of three decades.

In trauma patients, acute respiratory distress syndrome (ARDS) is associated with high morbidity and mortality. Changes in diagnostics, management, and treatment may have influenced the incidence of ARDS. Therefore, the purpose of this article is to evaluate whether there is a difference in the incidence of posttraumatic ARDS (1) over time, (2) attributable to geographic distribution, and 3) related to admitting surgical subspecialities. A comprehensive search of articles published in English and German language was conducted using PubMed, MEDLINE, and the ISI Web of Science. Search terms included ARDS, acute respiratory distress syndrome, multiple trauma, polytrauma, and surgery. A meta-regression was performed to analyze differences between several decades of patient recruitment (decade 1, 1981-1990; decade 2, 1991-2000; decade 3, 2001-2010), geographic location (North America and Europe), and the type of admitting surgical service (general vs. orthopedic trauma), respectively. Statistical analyses were performed with R (version 3.1.2, metafor package). The search included studies between January 1, 1980, and December 31, 2015 and revealed 43 trials from 40 publications (117,951 patients, 7,816 with posttraumatic ARDS). The median incidences over the last three decades were similar between decade 1 (10.4%), decade 2 (7.7%), and decade 3 (8.0%) (p = 0.8322). Geographical observations comparing central Europe and North America revealed no statistically significant difference (Europe 13.0%) and North America (6.9%), (p = 0.0696). The ARDS incidence in patients published based on a general surgery service (9.8%) was comparable to those published by orthopedic trauma surgeons (7.0%) (p = 0.3436). The results of this meta-analysis discard the assumption that the following factors have influenced the incidence of posttraumatic ARDS: There was neither a change in the incidence over the last decades, nor a geographical difference within western societies, nor associated with the admitting surgical subspeciality. Systematic review, level III.

Clinical predictors of early acute respiratory distress syndrome in trauma patients

BackgroundThe objectives of this study were to examine the incidence and severity of early acute respiratory distress syndrome (ARDS) according to the Berlin Definition and to identify risk factors associated with the development of early post-traumatic ARDS. MethodsA 2.5-year retrospective database of adult trauma patients who required mechanical ventilation for greater than 48 hours at a level 1 trauma center was analyzed for variables predictive of early (<48 hours after injury), mild, moderate, and severe ARDS and in-hospital mortality. ResultsOf 305 patients, 59 (19.3%) developed early ARDS: mild, 27 (45.8%); moderate, 26 (44.1%); and severe, 6 (10.1%). Performance of an emergent thoracotomy, blunt mechanism, and fresh frozen plasma administration were independently associated with the development of early ARDS. ARDS was not predictive of mortality. ConclusionsTrauma patients with blunt mechanism, who receive fresh frozen plasma, or undergo thoracotomy, are at risk of developing early ARDS.

Increased Risk of Post-Trauma Stroke after Traumatic Brain Injury-Induced Acute Respiratory Distress Syndrome.

This study determines whether acute respiratory distress syndrome (ARDS) is an independent risk factor for an increased risk of post-traumatic brain injury (TBI) stroke during 3-month, 1-year, and 5-year follow-ups, respectively, after adjusting for other covariates. Clinical data for the analysis were from the National Health Insurance Database 2000, which covered a total of 2121 TBI patients and 101 patients with a diagnosis of TBI complicated with ARDS (TBI-ARDS) hospitalized between January 1, 2001 and December 31, 2005. Each patient was tracked for 5 years to record stroke occurrences after discharge from the hospital. The prognostic value of TBI-ARDS was evaluated using a multivariate Cox proportional hazard model. The main outcome found that stroke occurred in nearly 40% of patients with TBI-ARDS, and the hazard ratio for post-TBI stroke increased fourfold during the 5-year follow-up period after adjusting for other covariates. The increased risk of hemorrhagic stroke in the ARDS group was considerably higher than in the TBI-only cohort. This is the first study to report that post-traumatic ARDS yielded an approximate fourfold increased risk of stroke in TBI-only patients. We suggest intensive and appropriate medical management and intensive follow-up of TBI-ARDS patients during the beginning of the hospital discharge.

The influence of extracorporeal membrane oxygenation therapy on intestinal mucosal barrier in a porcine model for post-traumatic acute respiratory distress syndrome

BackgroundIt is unclear at present whether extracorporeal membrane oxygenation (ECMO) therapy can improve intestinal mucous barrier function through increased perfusion. The present study establishes an animal model for post-traumatic acute respiratory distress syndrome (ARDS) and evaluates the effect of v-vECMO treatment on the intestinal mucosal barrier.MethodPulmonary contusion combined with ischemia-reperfusion injury was induced in 30 piglets. The animals were randomly divided into control, model, and ECMO groups. Serum I-FABP, d-lactate, and endotoxin were measured over a 24-h period. The jejunum and colon were collected post-mortem and evaluated histopathologically. The tissue was also examined using electron microscopy, and intestinal tight junction proteins (ZO-1 and occludin) were measured after 24 h of ECMO therapy. Mortality rate and cause of death were also recorded.ResultsThe serum markers evaluating the intestinal mucosal barrier deteriorated in the model group compared to the control group (p < 0.05). At 2 h, serum I-FABP, d-lactate, and endotoxin were significantly increased in the ECMO group compared to the model group (p < 0.05). At 12 h, I-FABP and d-lactate in the ECMO group dropped to model group levels. Serum d-lactate was slightly lower in the ECMO group (p > 0.05) and serum I-FABP was significantly lower than in the model group (p < 0.05) at 24 h. Similarly, serum endotoxin was slightly lower in the ECMO group than in the model group (p > 0.05) at 24 h. After 24 h of ECMO therapy, the occludin and ZO-1 protein concentrations in jejunum and colon mucosa increased moderately compared to that in the model group (p < 0.05). Morphologic structure of the jejunum and colon did not improved significantly after ECMO therapy. Finally, we observed that ECMO therapy moderately decreased mortality (25% vs. 50%).ConclusionIntestinal mucosal barrier continued to deteriorate in the model group. Although early ECMO therapy aggravates intestinal mucosal injury, the damage gradually improves later during therapy. The results show that ECMO therapy has a protective effect on the intestinal mucosal barrier in the later treatment stage.

Clinical and epidemiological characterization of acute respiratory distress syndrome in adult patients with femoral shaft fractures

ObjectiveTo describe the epidemiology of post-traumatic acute respiratory distress syndrome. MethodologyDescriptive observational study of patients with traumatic femoral shaft fracture requiring surgical management.The variables included in the analysis were demographics, injury severity, treatment methods, and in-hospital outcomes. A descriptive multivariate analysis was performed in order to explore the factors associated with the development of Acute Respiratory Distress Syndrome (ARDS). ResultsOf the 267 patients with femoral fractures, 86% were male patients with a mean age of 28.7 years and Injury Severity Score (ISS) of 12.7. The overall prevalence of ARDS was 8.6% while the prevalence among multiple trauma patients was 20%. Mortality was 7.5%. In the bivariate analysis, the variables associated with ARDS were the following: time between the trauma and hospital admission, ISS, contused lung, associated tibial fracture, urgent surgery requirement, and need for red blood cell transfusion. In the multivariate analysis, the associated variables were: blunt chest trauma, time elapsed until definitive fixation, and red blood cell transfusion during surgery.In the cohort, there was an increase in the annual prevalence of ARDS, from 4.3% in 2006 to 26.1% in 2011, as was also the case with multiple trauma, which increased from 14.5% in 2006 to 23.6% in 2011. A change in treatment was also evidenced, with increase in early total care (ETC) and damage control orthopaedics (DCO). ConclusionsIn our population, the prevalence of ARDS in patients with femoral fractures increases when associated with blunt chest trauma, delayed stabilization time, and the need for blood transfusion.

Caracterización clínica y epidemiológica del síndrome de dificultad respiratoria aguda en pacientes adultos con fractura diafisaria de fémur

ObjectiveTo describe the epidemiology of post-traumatic acute respiratory distress syndrome. MethodologyDescriptive observational study of patients with traumatic femoral shaft fracture requiring surgical management. The variables included in the analysis were demographics, injury severity, treatment methods, and in-hospital outcomes. A descriptive multivariate analysis was performed in order to explore the factors associated with the development of Acute Respiratory Distress Syndrome (ARDS). ResultsOf the 267 patients with femoral fractures, 86% were male patients with a mean age of 28.7 years and Injury Severity Score (ISS) of 12.7. The overall prevalence of ARDS was 8.6% while the prevalence among multiple trauma patients was 20%. Mortality was 7.5%. In the bivariate analysis, the variables associated with ARDS were the following: time between the trauma and hospital admission, ISS, contused lung, associated tibial fracture, urgent surgery requirement, and need for red blood cell transfusion. In the multivariate analysis, the associated variables were: blunt chest trauma, time elapsed until definitive fixation, and red blood celltrans fusion during surgery.In the cohort, there was an increase in the annual prevalence of ARDS, from 4.3% in 2006 to 26.1% in 2011, as was also the case with multiple trauma, which increased from 14.5% in 2006 to 23.6% in 2011. A change in treatment was also evidenced, with increase in early total care (ETC) and damage control orthopaedics (DCO). ConclusionsIn our population, the prevalence of ARDS in patients with femoral fractures increases when associated with blunt chest trauma, delayed stabilization time, and the need for blood transfusion.

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Introduction: We pesent a successful treatment case of post-traumatic acute respiratory distress syndrome (ARDS) with severe flail chest by airway pressure release ventilation (APRV). A 63-year-old male was seriously injured in a traffic accident and brought to our hospital. He was diagnosed with multiple rib fractures, massive hemothorax, flail chest, lung contusion with blunt chest trauma and fractures of the pelvis and extremities. After two emergency thoracotomies for the thoracic hemorrhage, his pulmonary function was markedly deteriorated and acute respiratory distress syndrome developed. The Ventilator was set to pressure support (PS) mode (PS 15cmH2O, PEEP 15cmH2O), but the PaO2/FiO2 ratio decreased to 45mmHg. We reset the ventilator to APRV mode for this critical respiratory status. After a few hours, the PaO2/FiO2 ratio improved to 175mmHg. After getting this improved respiratory state, surgical stabilization for the multiple rib fractures could be performed safely on the 3rd day of admission. And he was weaned from the mechanical ventilation on the 8th day. The etiology of respiratory failure after multisystem trauma is multifactorial involving direct lung and chest wall injury, fluid sequestration within the lung after shock, resuscitation and reperfusion, and the elaboration of numerous inflammatory mediators from soft tissue and gastrointestinal sources. Decreased lung compliance can be severe and elevated airway pressures may be necessary to prevent life-threatening hypoxia. We therefore concluded that APRV is a preferable mode of ventilator support for post-traumatic ARDS with severe flail chest.

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Introduction: Post-traumatic Acute Respiratory Distress Syndrome (ARDS) has historically been associated with high rates of morbidity and mortality. The incidence of post-traumatic ARDS is decreasing. Hypothesis: We hypothesize that, despite improvements in care, the associated morbidity and mortality have not declined. This study was undertaken to determine trends in the incidence of post-traumatic ARDS and its associated morbidity and mortality over the last decade. Methods: This retrospective cohort study assessed all trauma patients admitted to the Surgical Intensive Care Unit (SICU) at a Level I academic trauma center from 2001 – 2010. Patients requiring mechanical ventilation were screened for the development of ARDS. Demographics, injury data, fluid and blood component use, ventilator parameters, and outcomes were identified from the SICU, blood bank, and trauma databases. Results: A total of 3954 patients met study inclusion criteria, and 319 (8.1%) developed ARDS. The incidence of ARDS declined in a linear fashion (R2 = 0.76) from 14% in 2001 to 1.9% in 2010. Traditional risk factors including peak inspiratory pressures (PIP), blood component transfusion and positive fluid balance continue to be associated with the development of ARDS. Mean PIP, units of blood, and 48-hour fluid balance declined throughout the study period. After adjusting for age, injury severity, initial hemodynamics, blood component transfusions, fluid balance, and ventilator parameters, the development of ARDS continues to be associated with a 2.7 fold greater risk of death (95% CI 1.8, 4.2), decreased ventilator free days (p < 0.01), and increased length of ICU stay (p<0.01). Overall mortality each year remained stable at 29 – 33% throughout the decade. Conclusions: Though once relatively common after severe trauma, the incidence of ARDS has declined dramatically over the last decade. The cause of this decline is multifactorial, however despite improvements in care, the mortality associated with the development of ARDS remains high. Continued efforts to prevent the development of ARDS have lead to a near disappearance of this highly morbid complication.

Trauma center designation and the decreasing incidence of post-traumatic acute respiratory distress syndrome: A potential guidepost for quality improvement

Background The incidence of post-traumatic acute respiratory distress syndrome (ARDS) is decreasing. We hypothesized that disparities exist in the overall incidence and incidence of ARDS over time across different types of trauma centers. Methods The National Trauma Databank version 7.0 was queried for patients admitted to designated trauma centers (I–III) and ventilated at least 48 hours. Level I university admissions (group 1) were compared with level I community and level II/III center admissions (group 2). Results There were 43,664 patients with an incidence of ARDS of 5.2% (2,260) overall, 4.1% (1,062/25,937) in group 1, and 6.8% (1,198/17,727) in group 2 ( P < .001). The incidence decreased significantly in group 1 in contrast to group 2 yearly. The incidence in level I community centers was marked (608/5,180 [11.7%]) and increased significantly over time. On logistic regression, admission to a level I university center (.646 [.590–.707],<.001) was independently associated with ARDS. Conclusions Admission to a level I center may not necessarily confer similar results reflecting potential variation in management between centers that presumably provide similar service. These investigations may have significance to quality improvement.