The conjoint effect of reduced crystalloid administration and decreased damage-control laparotomy use in the development of abdominal compartment syndrome

EXCHANGE TRANSFUSION WITH VS -101: A NEW PEGYLATED-HB DESIGNED TO RESTORE PERFUSION AND INCREASE O 2 CARRYING CAPACITY

ABSTRACT

Blood products are the current standard for resuscitation of hemorrhagic shock. However, logistical constraints of perishable blood limit availability and prehospital use, meaning alternatives that provide blood-like responses remain an area of active investigation and development. VS-101 is a new PEGylated human hemoglobin-based oxygen carrier that avoids the logistical hurdles of traditional blood transfusion. This study sought to determine the safety and ability of VS -101 to maintain circulatory function and capillary oxygen delivery in a severe (50%) exchange transfusion (ET) model. Anesthetized, male Sprague Dawley rats were prepared for cardiovascular monitoring and phosphorescence quenching microscopy of interstitial fluid oxygen tension (P ISFo2 ) in the spinotrapezius muscle. Fifty-percent isovolemic ET of estimated total blood volume with either lactated Ringer's solution (LRS, n = 8) or VS -101 (n = 8) at 1 mL/kg/min was performed, and animals were observed for 240 min. VS -101 maintained P ISFo2 at baseline with a transient 18 ± 4 mm Hg decrease ( P < 0.05) in mean arterial pressure (MAP). In contrast, ET with LRS decreased P ISFo2 by approximately 50% ( P < 0.05) and MAP by 74 ± 10 mm Hg ( P < 0.05). All VS -101 animals survived 240 min, the experimental endpoint, while 100% of LRS animals expired by 142 min. VS -101 animals maintained normal tissue oxygenation through 210 min, decreasing by 25% ( P < 0.05 vs. baseline) thereafter, likely from VS -101 vascular clearance. No arteriolar vasoconstriction was observed following VS -101 treatment. In this model of severe ET, VS -101 effectively maintained blood pressure, perfusion, and P ISFo2 with no vasoconstrictive effects. Further elucidation of these beneficial resuscitation effects of VS -101 is warranted to support future clinical trials.

The unrestricted global effort to complete the COOL trial

BACKGROUND

Severe complicated intra-abdominal sepsis (SCIAS) has an increasing incidence with mortality rates over 80% in some settings. Mortality typically results from disruption of the gastrointestinal tract, progressive and self-perpetuating bio-mediator generation, systemic inflammation, and multiple organ failure. A further therapeutic option may be open abdomen (OA) management with negative peritoneal pressure therapy (NPPT) to remove inflammatory ascites and attenuate the systemic damage from SCIAS, although there are definite risks of leaving the abdomen open whenever it might possibly be closed. This potential therapeutic paradigm is the rationale being assessed in the Closed Or Open after Laparotomy (COOL trial) ( https://clinicaltrials.gov/ct2/show/NCT03163095 ). Initially, the COOL trial received Industry sponsorship; however, this funding mandated the use of a specific trademarked and expensive NPPT device in half of the patients allocated to the intervention (open) arm. In August 2022, the 3 M/Acelity Corporation without consultation but within the terms of the contract canceled the financial support of the trial. Although creating financial difficulty, there is now no restriction on specific NPPT devices and removing a cost-prohibitive intervention creates an opportunity to expand the COOL trial to a truly global basis. This document describes the evolution of the COOL trial, with a focus on future opportunities for global growth of the study.

METHODS

The COOL trial is the largest prospective randomized controlled trial examining the random allocation of SCIAS patients intra-operatively to either formal closure of the fascia or the use of the OA with an application of an NPPT dressing. Patients are eligible if they have free uncontained intraperitoneal contamination and physiologic derangements exemplified by septic shock OR severely adverse predicted clinical outcomes. The primary outcome is intended to definitively inform global practice by conclusively evaluating 90-day survival. Initial recruitment has been lower than hoped but satisfactory, and the COOL steering committee and trial investigators intend with increased global support to continue enrollment until recruitment ensures a definitive answer.

DISCUSSION

OA is mandated in many cases of SCIAS such as the risk of abdominal compartment syndrome associated with closure, or a planned second look as for example part of "damage control"; however, improved source control (locally and systemically) is the most uncertain indication for an OA. The COOL trial seeks to expand potential sites and proceed with the evaluation of NPPT agnostic to device, to properly examine the hypothesis that this treatment attenuates systemic damage and improves survival. This approach will not affect internal validity and should improve the external validity of any observed results of the intervention.

TRIAL REGISTRATION

National Institutes of Health ( https://clinicaltrials.gov/ct2/show/NCT03163095 ).

The unrestricted global effort to complete the COOL trial

BACKGROUND

Severe complicated intra-abdominal sepsis (SCIAS) has an increasing incidence with mortality rates over 80% in some settings. Mortality typically results from disruption of the gastrointestinal tract, progressive and self-perpetuating bio-mediator generation, systemic inflammation, and multiple organ failure. A further therapeutic option may be open abdomen (OA) management with negative peritoneal pressure therapy (NPPT) to remove inflammatory ascites and attenuate the systemic damage from SCIAS, although there are definite risks of leaving the abdomen open whenever it might possibly be closed. This potential therapeutic paradigm is the rationale being assessed in the Closed Or Open after Laparotomy (COOL trial) ( https://clinicaltrials.gov/ct2/show/NCT03163095 ). Initially, the COOL trial received Industry sponsorship; however, this funding mandated the use of a specific trademarked and expensive NPPT device in half of the patients allocated to the intervention (open) arm. In August 2022, the 3 M/Acelity Corporation without consultation but within the terms of the contract canceled the financial support of the trial. Although creating financial difficulty, there is now no restriction on specific NPPT devices and removing a cost-prohibitive intervention creates an opportunity to expand the COOL trial to a truly global basis. This document describes the evolution of the COOL trial, with a focus on future opportunities for global growth of the study.

METHODS

The COOL trial is the largest prospective randomized controlled trial examining the random allocation of SCIAS patients intra-operatively to either formal closure of the fascia or the use of the OA with an application of an NPPT dressing. Patients are eligible if they have free uncontained intraperitoneal contamination and physiologic derangements exemplified by septic shock OR severely adverse predicted clinical outcomes. The primary outcome is intended to definitively inform global practice by conclusively evaluating 90-day survival. Initial recruitment has been lower than hoped but satisfactory, and the COOL steering committee and trial investigators intend with increased global support to continue enrollment until recruitment ensures a definitive answer.

DISCUSSION

OA is mandated in many cases of SCIAS such as the risk of abdominal compartment syndrome associated with closure, or a planned second look as for example part of "damage control"; however, improved source control (locally and systemically) is the most uncertain indication for an OA. The COOL trial seeks to expand potential sites and proceed with the evaluation of NPPT agnostic to device, to properly examine the hypothesis that this treatment attenuates systemic damage and improves survival. This approach will not affect internal validity and should improve the external validity of any observed results of the intervention.

TRIAL REGISTRATION

National Institutes of Health ( https://clinicaltrials.gov/ct2/show/NCT03163095 ).

Fluid Management, Intra-Abdominal Hypertension and the Abdominal Compartment Syndrome: A Narrative Review

BACKGROUND

General pathophysiological mechanisms regarding associations between fluid administration and intra-abdominal hypertension (IAH) are evident, but specific effects of type, amount, and timing of fluids are less clear.

OBJECTIVES

This review aims to summarize current knowledge on associations between fluid administration and intra-abdominal pressure (IAP) and fluid management in patients at risk of intra-abdominal hypertension and abdominal compartment syndrome (ACS).

METHODS

We performed a structured literature search from 1950 until May 2021 to identify evidence of associations between fluid management and intra-abdominal pressure not limited to any specific study or patient population. Findings were summarized based on the following information: general concepts of fluid management, physiology of fluid movement in patients with intra-abdominal hypertension, and data on associations between fluid administration and IAH.

RESULTS

We identified three randomized controlled trials (RCTs), 38 prospective observational studies, 29 retrospective studies, 18 case reports in adults, two observational studies and 10 case reports in children, and three animal studies that addressed associations between fluid administration and IAH. Associations between fluid resuscitation and IAH were confirmed in most studies. Fluid resuscitation contributes to the development of IAH. However, patients with IAH receive more fluids to manage the effect of IAH on other organ systems, thereby causing a vicious cycle. Timing and approach to de-resuscitation are of utmost importance, but clear indicators to guide this decision-making process are lacking. In selected cases, only surgical decompression of the abdomen can stop deterioration and prevent further morbidity and mortality.

CONCLUSIONS

Current evidence confirms an association between fluid resuscitation and secondary IAH, but optimal fluid management strategies for patients with IAH remain controversial.

Trends in Prehospital Blood, Crystalloid, and Colloid Administration in Accordance With Changes in Tactical Combat Casualty Care Guidelines

INTRODUCTION

Hemorrhage is the leading threat to the survival of battlefield casualties. This study aims to investigate the types of fluids and blood products administered in prehospital trauma encounters to discover the effectiveness of Tactical Combat Casualty Care (TCCC) recommendations.

MATERIALS AND METHODS

This is a secondary analysis of a previously described dataset from the Department of Defense Trauma Registry with a focus on prehospital fluid and blood administration in conjunction with changes in the TCCC guidelines. We collected demographic information on each patient. We categorized receipt of each fluid type and blood product as a binary variable for each casualty and evaluated trends over 2007-2020 both unadjusted and controlling for injury severity and mechanism of injury.

RESULTS

Our original dataset comprised 25,897 adult casualties from January 1, 2007 through March 17, 2020. Most (97.3%) of the casualties were male with a median age of 25. Most (95.5%) survived to hospital discharge, and 12.2% of the dataset received fluids of any kind. Medical personnel used crystalloids in 7.4% of encounters, packed red blood cells in 2.0%, and whole blood in 0.5% with very few receiving platelets or freeze-dried plasma. In the adjusted model, we noted significant year-to-year increases in intravenous fluid administration from 2014 to 2015 and 2018 to 2019, with significant decreases noted in 2008-2009, 2010-2012, and 2015-2016. We noted no significant increases in Hextend used, but we did note significant decreases in 2010-2012. For any blood product, we noted significant increases from 2016 to 2017, with decreases noted in 2009-2013, 2015-2016, and 2017-2018. Overall, we noted a general spike in all uses in 2011-2012 that rapidly dropped off 2012-2013. Crystalloids consistently outpaced the use of blood products. We noted a small upward trend in all blood products from 2017 to 2019.

CONCLUSIONS

Changes in TCCC guidelines did not immediately translate into changes in prehospital fluid administration practices. Crystalloid fluids continue to dominate as the most commonly administered fluid even after the 2014 TCCC guidelines changed to use of blood products over crystalloids. There should be future studies to investigate the reasons for delay in guideline implementation and efforts to improve adherence.

Regionalization of trauma care by operative experience: Does the volume of emergent laparotomy matter?

INTRODUCTION

The volume-outcome relationship led to the regionalization of trauma care. The relationship between trauma centers' injury-specific laparotomy volume and outcomes has not been explored. The aim of our study was to examine the relationship between a trauma center's injury-specific laparotomy volume and outcomes in blunt and penetrating trauma patients.

METHODS

We performed a (2017) analysis of the Trauma Quality Improvement Program database. We included adult (age, ≥18 years) blunt and penetrating trauma patients who required emergent laparotomies for hemorrhage control. Trauma centers were stratified based on their blunt and penetrating laparotomy volumes: high volume (HV), ≥25 cases per year; medium volume (MV), 13 to 24 cases per year; and low volume (LV), ≤12 cases per year. Multivariate regression analysis was performed to explore predictors of in-hospital mortality.

RESULTS

A total of 8,588 patients underwent emergent laparotomy for either blunt (4,936; 57.5%) or penetrating injuries (3,652; 42.5%). Overall, mean ± SD age was 40 ± 17 years, abdomen Abbreviated Injury Scale was 3 (2-4), and Injury Severity Score was 26 (17-35). For American College of Surgeons (ACS) level I centers, 50% were HV; 29%, MV; and 21%, LV. For ACS level II centers, 7% were HV; 23%, MV; and 70%, LV. For ACS level III centers, 100% were LV. On multivariate regression analysis, admission of blunt and penetrating trauma patients to HV blunt and HV penetrating centers, respectively, was independently associated with improved in-hospital mortality. High-volume blunt centers had a significantly lower time to laparotomy (72 [41-144] minutes) versus MV (81 [49-145] minutes) and LV (94 [56-158] minutes) centers (p < 0.001). The same trend was observed for HV penetrating trauma centers (35 [24-52] minutes) versus MV (46 [33-63] minutes) and LV (51 [38-69] minutes) centers (p < 0.001).

CONCLUSION

Blunt and penetrating injury patients requiring emergent laparotomy had higher survival when admitted to trauma centers with HV operative experience for their particular mechanism of injury. The regionalization of trauma care should be based on a thorough evaluation of trauma centers' injury-specific operative experience.

LEVEL OF EVIDENCE

Prognostic, Level III; Therapeutic/Care management, Level IV.

Quality Improvement of Damage Control Laparotomy: Impact of the Establishment of a Single Korean Regional Trauma Center

BACKGROUND

Damage control laparotomy (DCL) is a lifesaving technique to minimize the lethal triad of coagulopathy, hypothermia, and acidosis. The government has nominated and supported our center as one of the regional trauma centers of South Korea since 2014. This study aimed to investigate the improving outcomes of patients undergoing DCL before and after the establishment of the trauma center.

METHOD

The period from January 2011 to December 2017 was divided into pre-trauma center (pre-TC) (2011-2013) and trauma center (TC) (2014-2017) periods. Multivariable logistic regression was performed to identify the risk factors and risk-adjusted cumulative sum (RA-CUSUM), and graphs were used to monitor the change in mortality.

RESULT

Of the 485 patients who underwent trauma laparotomy, DCL was performed for 119 patients (24.5%). The operation time (99 vs. 80 min, p = 0.022), time from admission to operation (125 vs. 112 min, p = 0.010), time from admission to first treatment (119 vs. 99 min, p = 0.004), and time from admission to first transfusion (70 vs. 52 min, p = 0.009) were significantly shortened in the TC period. The ratio of plasma to packed red blood cells in massive transfusions (≥PRBCs 10 units within the first 24 h) was significantly increased in the TC period (0.56 vs. 0.72, p = 0.004). RA-CUSUM curves revealed that the risk-adjusted 30-day mortality improved and then plateaued in the TC period.

CONCLUSION

After the implementation of a trauma center, more prompt intervention and damage control resuscitation could be achieved. Moreover, risk-adjusted mortality of DCL was improved.

Abdominal Compartment Syndrome: Improving Outcomes With A Multidisciplinary Approach - A Narrative Review

Abdominal compartment syndrome (ACS) refers to a severe increase in intra-abdominal pressure associated with single or multiorgan failure. ACS with specific pathophysiological processes and detrimental outcomes may occur in a variety of clinical conditions. Patients with ACS are predominantly managed in critical care settings, however, a wide range of multidisciplinary interventions are frequently required from medical, surgical, radiological and nursing specialties. The medical management, aiming to prevent the progression of intra-abdominal hypertension to ACS, is extensively reviewed. Timing and techniques of surgical decompression techniques, as well as management of open abdomen, are outlined. In summary, the current narrative review provides data on history, definitions, epidemiology and pathophysiology of the syndrome and highlights the importance of multidisciplinary approach in the management of ACS in adults.

Evaluation and Management of Abdominal Compartment Syndrome in the Emergency Department

BACKGROUND

Abdominal compartment syndrome is a potentially deadly condition that can be missed in the emergency department setting.

OBJECTIVE

The purpose of this narrative review article is to provide a summary of the background, pathophysiology, diagnosis, and management of abdominal compartment syndrome with a focus on emergency clinicians.

DISCUSSION

Abdominal compartment syndrome is caused by excessive pressure within the abdominal compartment due to diminished abdominal wall compliance, increased intraluminal contents, increased abdominal contents, or capillary leak/fluid resuscitation. History and physical examination are insufficient in isolation, and the gold standard is intra-abdominal pressure measurement. Abdominal compartment syndrome is defined as an intra-abdominal pressure >20 mm Hg with evidence of end-organ injury. Management involves increasing abdominal wall compliance (e.g., analgesia, sedation, and neuromuscular blocking agents), evacuating gastrointestinal contents (e.g., nasogastric tubes, rectal tubes, and prokinetic agents), avoiding excessive fluid resuscitation, draining intraperitoneal contents (e.g., percutaneous drain), and decompressive laparotomy in select cases. Patients are critically ill and often require admission to a critical care unit.

CONCLUSIONS

Abdominal compartment syndrome is an increasingly recognized condition with the potential for significant morbidity and mortality. It is important for clinicians to be aware of the current evidence regarding the diagnosis, management, and disposition of these patients.

Plasma for burn shock resuscitation: is it time to go back to the future?

Patients with burn shock can be challenging to resuscitate. Burn shock produces a variety of physiologic derangements: Patients are hypovolemic from volume loss, have a increased systemic vascular resistance, and may have a depressed cardiac output depending on the extent of the thermal injury. Additionally, the burn wound produces a significant inflammatory cascade of events that contributes to the shock state. Fluid resuscitation is foundational for the initial treatment of burn shock. Typical resuscitation is with intravenous lactated Ringer's in accordance with well-established formulas based on burn wound size. In the past century, as therapies to treat thermal injuries were being developed, plasma was the fluid used for burn resuscitation; in fact, plasma was used in World War II and throughout the 1950s and 1960s. Plasma was abandoned because of infectious risks and complications. Despite huge strides in transfusion medicine and the increased safety of blood products, plasma has never been readopted for burn resuscitation. Over the past 15 years, there has been a paradigm shift in trauma resuscitation: Less crystalloid and more blood products are used; this strategy has demonstrated improved outcomes. Plasma is a physiologic fluid that stabilizes the endothelium. The endotheliopathy of trauma has been described and is mitigated by transfusion strategies with a 1:1 ratio of RBCs to plasma. Thermal injury also results in endothelial dysfunction: the endotheliopathy of burns. Plasma is likely a better resuscitation fluid for patients with significant burn wounds because of its capability to restore intravascular volume status and treat the endotheliopathy of burns.

Closed Or Open after Source Control Laparotomy for Severe Complicated Intra-Abdominal Sepsis (the COOL trial): study protocol for a randomized controlled trial

Background

Severe complicated intra-abdominal sepsis (SCIAS) has an increasing incidence with mortality rates over 80% in some settings. Mortality typically results from disruption of the gastrointestinal tract, progressive and self-perpetuating bio-mediator generation, systemic inflammation, and multiple organ failure. Principles of treatment include early antibiotic administration and operative source control. A further therapeutic option may be open abdomen (OA) management with active negative peritoneal pressure therapy (ANPPT) to remove inflammatory ascites and ameliorate the systemic damage from SCIAS. Although there is now a biologic rationale for such an intervention as well as non-standardized and erratic clinical utilization, this remains a novel therapy with potential side effects and clinical equipoise.

Methods

The Closed Or Open after Laparotomy (COOL) study will constitute a prospective randomized controlled trial that will randomly allocate eligible surgical patients intra-operatively to either formal closure of the fascia or use of the OA with application of an ANPTT dressing. Patients will be eligible if they have free uncontained intra-peritoneal contamination and physiologic derangements exemplified by septic shock OR a Predisposition-Infection-Response-Organ Dysfunction Score ≥ 3 or a World-Society-of-Emergency-Surgery-Sepsis-Severity-Score ≥ 8. The primary outcome will be 90-day survival. Secondary outcomes will be logistical, physiologic, safety, bio-mediators, microbiological, quality of life, and health-care costs. Secondary outcomes will include days free of ICU, ventilation, renal replacement therapy, and hospital at 30 days from the index laparotomy. Physiologic secondary outcomes will include changes in intensive care unit illness severity scores after laparotomy. Bio-mediator outcomes for participating centers will involve measurement of interleukin (IL)-6 and IL-10, procalcitonin, activated protein C (APC), high-mobility group box protein-1, complement factors, and mitochondrial DNA. Economic outcomes will comprise standard costing for utilization of health-care resources.

Discussion

Although facial closure after SCIAS is considered the current standard of care, many reports are suggesting that OA management may improve outcomes in these patients. This trial will be powered to demonstrate a mortality difference in this highly lethal and morbid condition to ensure critically ill patients are receiving the best care possible and not being harmed by inappropriate therapies based on opinion only.

Trial registration

ClinicalTrials.gov, NCT03163095.

Choice of Fluid Therapy in the Initial Management of Sepsis, Severe Sepsis, and Septic Shock

Sepsis results in disruption of the endothelial glycocalyx layer and damage to the microvasculature, resulting in interstitial accumulation of fluid and subsequently edema. Fluid resuscitation is a mainstay in the initial treatment of sepsis, but the choice of fluid is unclear. The ideal resuscitative fluid is one that restores intravascular volume while minimizing edema; unfortunately, edema and edema-related complications are common consequences of current resuscitation strategies. Crystalloids are recommended as first-line therapy, but the type of crystalloid is not specified. There is increasing evidence that normal saline is associated with increased mortality and kidney injury; balanced crystalloids may be a safer alternative. Albumin is similar to crystalloids in terms of outcomes in the septic population but is costlier. Hydroxyethyl starches appear to increase mortality and kidney injury in the critically ill and are no longer indicated in these patients. In the trauma population, the shift to plasma-based resuscitation with decreased use of crystalloid and colloid in the treatment of hemorrhagic shock has led to decreased inflammatory and edema-mediated complications. Studies are needed to determine if these benefits also occur with a similar resuscitation strategy in the setting of sepsis.

The Evolution of Damage Control in Concept and Practice

Damage control surgery (DCS) began as an adjunct approach to hemorrhage control, seeking to facilitate the body's innate clotting ability when direct repair or ligation was impossible, but it has since become a valuable instrument for a broader collection of critically ill surgical patients in whom metabolic dysfunction is the more immediate threat to life than imminent exsanguination. Modern damage control is a strategy that combines the principles of DCS with those of damage control resuscitation. When used correctly, damage control may improve survival in previously unsalvageable patients; when used incorrectly, it can subject patients to imprudent risk and contribute to morbidity. This review discusses the evolution of damage control in both concept and practice, summarizing available literature and experience to guide patient selection, medical decision-making, and strategy implementation throughout the preoperative, intraoperative, and early postoperative periods.

Surgical Critical Care: Gastrointestinal Complications

Critical illness and injury affect the gastrointestinal tract almost uniformly. Complications include the sequelae of direct intestinal injury and repair, impaired motility, intra-abdominal hypertension, and ulceration, among others. Contemporary clinical practice has incorporated many advances in the prevention and treatment of gastrointestinal complications during critical illness. This article discusses the epidemiology, risk factors, means of diagnosis, treatment, and prevention of some of these compilations.

Decreasing the Use of Damage Control Laparotomy in Trauma: A Quality Improvement Project

BACKGROUND

Our institution has published damage control laparotomy (DCL) rates of 30% and documented the substantial morbidity associated with the open abdomen. The purpose of this quality improvement (QI) project was to decrease the rate of DCL at a busy, Level I trauma center in the US.

STUDY DESIGN

A prospective cohort of all emergent trauma laparotomies from November 2013 to October 2015 (QI group) was followed. The QI intervention was multifaceted and included audit and feedback for every DCL case. Morbidity and mortality of the QI patients were compared with those from a published control (control group: emergent laparotomy from January 2011 to October 2013).

RESULTS

A significant decrease was observed immediately on beginning the QI project, from a 39% DCL rate in the control period to 23% in the QI group (p < 0.001). This decrease was sustained over the 2-year study period. There were no differences in demographics, Injury Severity Score, or transfusions between the groups. No differences organ/space infection (control 16% vs QI 12%; p = 0.15), fascial dehiscence (6% vs 8%; p = 0.20), unplanned relaparotomy (11% vs 10%; p = 0.58), or mortality (9% vs 10%; p = 0.69) were observed. The reduction in use resulted in a decrease of 68 DCLs over the 2-year period. There was a further reduction in the rate of DCL to 17% after completion of the QI project.

CONCLUSIONS

A QI initiative rapidly changed the use of DCL and improved quality of care by decreasing resource use without an increase morbidity or mortality. This decrease was sustained during the QI period and further improved upon after its completion.

Prevalence and mortality of abdominal compartment syndrome in severely injured patients: A systematic review

BACKGROUND

Abdominal compartment syndrome (ACS) in severely injured patients is associated with high morbidity and mortality. Many efforts have been made to improve outcome of patients with ACS. A treatment algorithm for ACS patients was introduced on January 1, 2005 by the World Society of the Abdominal Compartment Syndrome. The aim of this study was to determine the prevalence and mortality rate of ACS among severely injured patients before and after January 1, 2005 using a systematic literature review.

METHOD

Databases of Embase, Medline (OvidSP), Web of Science, CINAHL, CENTRAL, PubMed publisher, and Google Scholar were searched for terms related to severely injured patients and ACS. Original studies reporting ACS in trauma patients were considered eligible. Data on study design, population, definitions, prevalence, and mortality rates were extracted. Pooled prevalence and mortality of ACS among severely injured patients were calculated for both time periods using inversed variance weighting assuming a random effects model. Tests for heterogeneity were applied.

RESULTS

A total of 80 publications were included. Prevalence of studies that finished enrolling patients before January 1, 2005 ranged from 0.5% to 36.4% and 0.0% to 28.0% in studies after that date. For severely injured patients admitted to the ICU, this range was 0.5% to 1.3% before 2005 and 0% in one publication in the second time period. For patients with visceral injuries, ACS prevalence ranged 1.0% to 20.0%; one study in the second time period reported 11.1%. The prevalence among severely injured patients who underwent trauma laparotomy ranged from 0.9% to 36.4% in the first time period. Two studies after January 1, 2005 reported ACS prevalence of 2.3% and 13.2%, respectively. The mortality rate in both time periods ranged between 0.0% and 100.0%.

CONCLUSION

The overall prevalence of ACS ranged from 0.0% to 36.4%. Future studies are needed to measure the effect of improved trauma care and effectiveness of the World Society of the Abdominal Compartment Syndrome Consensus Statements.

LEVEL OF EVIDENCE

Systematic review/meta-analysis, level III.

Massive transfusion: An update for the anesthesiologist

Exsanguination from trauma, gastrointestinal bleeding, and obstetric hemorrhage remains a major source of mortality across the planet. Continued research into resuscitation strategies and evolving technology and blood product storage has allowed for patient to undergo very large volume transfusions, even to the point of replacing a patient’s blood volume several times over. As massive transfusions have become more common, more studies have been performed delineating the exact patient population that would benefit, start- and stop-points of transfusions, complications and avoidance of the same. We discuss these points and provide information and strategies for massive transfusion.

10-Year trend in crystalloid resuscitation: Reduced volume and lower mortality

BACKGROUND

Liberal emergency department (ED) resuscitation after trauma may lead to uncontrolled hemorrhage, reduced organ perfusion, and compartment syndrome. Recent guidelines reduced the standard starting point for crystalloid resuscitation from 2 L to 1 L and emphasized "balanced" resuscitation. The purpose of this study was to characterize how an urban, Level 1 trauma center has responded to changes in crystalloid resuscitation practices over time and to describe associated patient outcomes.

METHODS

This is a retrospective review of trauma patients who sustained moderate to severe injury (ISS > 9) and received crystalloid resuscitation in the ED during 1/2004-12/2013 at an urban, Level 1 trauma center. Patient data collected included age, gender, Glasgow Coma Scale (GCS) score, initial systolic blood pressure (SBP), mechanism of injury, regional Abbreviated Injury Scale (AIS) score, Injury Severity Score (ISS), volume of blood products and crystalloids administered in the ED. Patients who received <2 L of crystalloid were considered low-volume while those who received ≥2 L were high-volume patients. Clinical characteristics and outcomes were compared between high- and low-volume cohorts, and multivariate regression was used to adjust for confounders. Trend analysis examined changes in variables over time.

RESULTS

1571 moderate to severely injured patients received crystalloid resuscitation; 1282 (82%) were low-volume and 289 (18%) were high-volume. Compared to high-volume patients, low-volume patients presented with a higher median SBP (134 vs. 122 mmHg, p < 0.001) and GCS (15 vs. 14, p < 0.001). Low-volume patients also had lower median ISS (15 vs. 19, p < 0.001). Unadjusted mortality was lower in the low-volume cohort (7% vs. 19%, p < 0.001). Multivariate analysis demonstrated that high-volume patients had increased odds of mortality compared to low-volume patients (AOR 1.88, p = 0.008). Decreased rates of high-volume resuscitation and overall mortality were demonstrated over the 10-year study period.

CONCLUSIONS

The observed decrease in high-volume crystalloid resuscitations in the ED paralleled a reduction in mortality over the ten-year period. In addition, adjusted mortality was higher in those receiving high-volume resuscitation.

Increased pressure within the abdominal compartment: intra-abdominal hypertension and the abdominal compartment syndrome

PURPOSE OF REVIEW

This article reviews recent developments related to intra-abdominal hypertension (IAH)/abdominal compartment syndrome (ACS) and clinical practice guidelines published in 2013.

RECENT FINDINGS

IAH/ACS often develops because of the acute intestinal distress syndrome. Although the incidence of postinjury ACS is decreasing, IAH remains common and associated with significant morbidity and mortality among critically ill/injured patients. Many risk factors for IAH include those findings suggested to be indications for use of damage control surgery in trauma patients. Medical management strategies for IAH/ACS include sedation/analgesia, neuromuscular blocking and prokinetic agents, enteral decompression tubes, interventions that decrease fluid balance, and percutaneous catheter drainage. IAH/ACS may be prevented in patients undergoing laparotomy by leaving the abdomen open where appropriate. If ACS cannot be prevented with medical or surgical management strategies or treated with percutaneous catheter drainage, guidelines recommend urgent decompressive laparotomy. Use of negative pressure peritoneal therapy for temporary closure of the open abdomen may improve the systemic inflammatory response and patient-important outcomes.

SUMMARY

In the last 15 years, investigators have better clarified the pathogenesis, epidemiology, diagnosis, and appropriate prevention of IAH/ACS. Subsequent study should be aimed at understanding which treatments effectively lower intra-abdominal pressure and whether these treatments ultimately affect patient-important outcomes.

Secondary extremity compartment syndrome after traumatic cardiac arrest

The objective of this case report is to investigate the pathophysiology, diagnosis, and surgical management of secondary extremity compartment syndrome. This case-based review documents the development of secondary extremity compartment syndrome in the setting of high-volume fluid resuscitation for a hemorrhagic cardiac arrest complicated by a global ischemia-reperfusion injury. A 21-year-old male presented with traumatic, hemorrhagic cardiac arrest. Following a resuscitative thoracotomy, massive transfusion and return of spontaneous circulation, the patient underwent damage control surgery. Over the first 48 h following the injury, the patient developed progressive diffuse interstitial edema ultimately culminating in compartment syndrome of the remaining three uninjured extremities as well as both uninjured gluteal compartments. The patient underwent bilateral lower extremity, thigh, gluteal, and right upper extremity compartment fasciotomies, with the left lower extremity being the single, traumatically injured extremity. To our knowledge, this is the only case of secondary extremity compartment syndrome in which bilateral gluteal compartments and bilateral thigh compartments were involved in addition to the bilateral upper and right lower extremities. The goal of this case report is to examine the pathophysiology of the development of secondary extremity compartment syndrome, with an emphasis on early recognition and surgical intervention.

Benefits of Initial Limited Crystalloid Resuscitation in Severely Injured Trauma Patients at Emergency Department

Background

Whether initial limited crystalloid resuscitation (LCR) benefits to all severely injured trauma patients receiving blood transfusions at emergency department (ED) is uncertain. We aimed to determine the role of LCR and its associations with packed red blood cell (PRBC) transfusion during initial resuscitation.

Methods

Trauma patients receiving blood transfusions were reviewed from 2004 to 2013. Patients with LCR (L group, defined as < 2,000 mL) and excessive crystalloid resuscitation (E group, defined as ≥ 2,000 mL) were compared separately in terms of basic demographic, clinical variables, and hospital outcomes. Logistic regression, R-square (R²), and Spearman rho correlation were used for analysis.

Results

A total of 633 patients were included. The mortality was 51% in L group and 45% in E group (P = 0.11). No statistically significant difference was found in terms of basic demographics, vital signs upon arrival at ED, or injury severity between the groups. The volume of blood transfused strongly correlated with the volume of crystalloid infused in E group (R² = 0.955). Crystalloid to PRBC (C/PRBC) ratio was 0.8 in L group and 1.3 in E group (P < 0.01). The correlations between C/PRBC and ED versus ICU versus hospital length of stay (LOS) via Spearman rho were 0.25, 0.22, and 0.22, respectively.

Conclusions

Similar outcomes were observed in trauma patients receiving blood transfusions regardless of the crystalloid infusion volume. More crystalloid infusions were associated with more blood transfusions. The C/PRBC did not demonstrate predictive value regarding mortality but might predict LOS in severely injured trauma patients.

Prothrombin complex concentrate versus fresh-frozen plasma for reversal of coagulopathy of trauma: is there a difference?

INTRODUCTION

The development of coagulopathy of trauma is multifactorial associated with hypoperfusion and consumption of coagulation factors. Previous studies have compared the role of factor replacement versus FPP for reversal of trauma coagulopathy. The purpose of our study was to determine the time to correction of coagulopathy and blood product requirement in patients who received PCC+FFP compared with patients who received FFP alone.

METHODS

We performed a retrospective analysis of a prospectively maintained database of all coagulopathic (INR ≥ 1.5) trauma patients presenting to our level I trauma center during a 2-years period (2011-2012). Patients were stratified into two groups: patients who received PCC+FFP and patients who received FFP alone. Patients in the two groups were matched in a 1:3 (PCC+FFP:FFP) ratio using propensity score matching for demographics, injury severity, vital parameters, and initial INR. The two groups were then compared for: correction of INR, time to correction of INR, thromboembolic complications, mortality, and cost of therapy.

RESULTS

A total of 252 were included in the analysis [PCC+FFP:63; FFP:189]. The mean age was 44 ± 20 years; 70 % were male, with a median ISS score of 27 [16-38]. PCC use was associated with an accelerated correction of INR (394 vs. 1,050 min; p 0.001), reduction in requirement of pack red blood cell (6.6 vs. 10 units; p 0.001) and FFP (2.8 vs. 3.9 units; p 0.01), and decline in mortality (23 vs. 28%; p 0.04). PCC+FFP use was associated with a higher cost of therapy ($1,470 ± 845 vs. 1,171 ± 949; p 0.01) but lower overall cost of transfusion ($7,110 ± 1,068 vs. 9,571 ± 1,524; p 0.01) compared with FFP therapy alone.

CONCLUSIONS

PCC in conjunction with FFP rapidly corrects INR in a matched cohort of trauma patients not on warfarin therapy compared with FFP therapy alone. The use of PCC as an adjunct to FFP therapy is associated with reduction of blood product requirement and also lowers overall cost.

Early autologous fresh whole blood transfusion leads to less allogeneic transfusions and is safe

BACKGROUND

The practice of transfusing ones' own shed whole blood has obvious benefits such as reducing the need for allogeneic transfusions and decreasing the need for other fluids that are typically used for resuscitation in trauma. It is not widely adopted in the trauma setting because of the concern of worsening coagulopathy and the inflammatory process. The aim of this study was to assess outcomes in trauma patients receiving whole blood autotransfusion (AT) from hemothorax.

METHODS

This is a multi-institutional retrospective study of all trauma patients who received autologous whole blood transfusion from hemothorax from two Level I trauma centers. Patients who received AT were matched to patients who did not receive AT (No-AT) using propensity score matching in a 1:1 ratio for admission age, sex, mechanism, type of injury, Injury Severity Score (ISS), Glasgow Coma Scale (GCS) score, systolic blood pressure, heart rate, hemoglobin, international normalized ratio (INR), prothrombin time, partial prothrombin time, and lactate. AT was defined as transfusion of autologous blood from patient's hemothorax, which was collected from the chest tubes and anticoagulated with citrate phosphorous dextrose. Outcome measures were in-hospital complications, 24-hour INR, and mortality. In-hospital complications were defined as adult respiratory distress syndrome, sepsis, disseminated intravascular coagulation, renal insufficiency, and transfusion-related acute lung injury.

RESULTS

A total of 272 patients (AT, 136; No-AT, 136) were included. There was no difference in admission age (p = 0.6), ISS (p = 0.56), head Abbreviated Injury Scale (AIS) score (p = 0.42), systolic blood pressure (p = 0.88), and INR (p = 0.62) between the two groups. There was no significant difference in in-hospital complications (p = 0.61), mortality (p = 0.51), and 24-hour postadmission INR (0.31) between the AT and No-AT groups. Patients who received AT had significantly lower packed red blood cell (p = 0.01) and platelet requirements (p = 0.01). Cost of transfusions (p = 0.01) was significantly lower in the AT group compared with the No-AT group.

CONCLUSION

The autologous transfusion of the patient's shed blood collected through chest tubes for hemothorax was found to be safe without complications in this study. It also reduced the need for allogeneic transfusions and decreased hospital costs. This study demonstrates safety data that would help in designing larger prospective multicenter studies to determine whether this practice is truly safe and effective.

LEVEL OF EVIDENCE

Epidemiologic/prognostic study, level III.

Identification of ideal resuscitation pressure with concurrent traumatic brain injury in a rat model of hemorrhagic shock

BACKGROUND

Traumatic brain injury (TBI) is often associated with uncontrolled hemorrhagic shock (UHS), which contributes significantly to the mortality of severe trauma. Studies have demonstrated that permissive hypotension resuscitation improves the survival for uncontrolled hemorrhage. What the ideal target mean arterial pressure (MAP) is for TBI with UHS remains unclear.

METHODS

With the rat model of TBI in combination with UHS, we investigated the effects of a series of target resuscitation pressures (MAP from 50-90 mm Hg) on animal survival, brain perfusion, and organ function before hemorrhage controlled.

RESULTS

Rats in 50-, 60-, and 70-mm Hg target MAP groups had less blood loss and less fluid requirement, a better vital organ including mitochondrial function and better cerebral blood flow, and animal survival (8, 6, and 7 of 10, respectively) than 80- and 90-mm Hg groups. The 70-mm Hg group had a better cerebral blood flow and cerebral mitochondrial function than in 50- and 60-mm Hg groups. In contrast, 80- and 90-mm Hg groups resulted in an excessive hemodilution, a decreased blood flow, an increased brain water content, and more severe cerebral edema.

CONCLUSIONS

A 50-mm Hg target MAP is not suitable for the resuscitation of TBI combined with UHS. A 70 mm Hg of MAP is the ideal target resuscitation pressure for this trauma, which can keep sufficient perfusion to the brain and keep good organ function including cerebral mitochondrial function.

Mortality after trauma laparotomy in geriatric patients

BACKGROUND

Geriatric patients are at higher risk for adverse outcomes after injury because of their altered physiological reserve. Mortality after trauma laparotomy remains high; however, outcomes in geriatric patients after trauma laparotomy have not been well established. The aim of our study was to identify factors predicting mortality in geriatric trauma patients undergoing laparotomy.

METHODS

A retrospective study was performed of all trauma patients undergoing a laparotomy at our level 1 trauma center over a 6-y period (2006-2012). Patients with age ≥55 y who underwent a trauma laparotomy were included. Patients with head abbreviated injury scale (AIS) score ≥ 3 or thorax AIS ≥ 3 were excluded. Our primary outcome measure was mortality. Significant factors in univariate regression model were used in multivariate regression analysis to evaluate the factors predicting mortality.

RESULTS

A total of 1150 patients underwent a trauma laparotomy. Of which 90 patients met inclusion criteria. The mean age was 67 ± 10 y, 63% were male, and median abdominal AIS was 3 (2-4). Overall mortality rate was 23.3% (21/90) and progressively increased with age (P = 0.013). Age (P = 0.02) and lactate (P = 0.02) were the independent predictors of mortality in geriatric patients undergoing laparotomy.

CONCLUSIONS

Mortality rate after trauma laparotomy increases with increasing age. Age and admission lactate were the predictors of mortality in geriatric population undergoing trauma laparotomies.