Effect of cardiolipin on the lamellarity and elongation of liposomes hydrated in PBS.

Lamellarity and shape are important factors in the formation of vesicles and determine their role in biological systems and pharmaceutical applications. Cardiolipin (CL) is a major lipid in many biological membranes and exerts a great influence on their structural organization due to its particular structure and physico-chemical properties. Here, we used small-angle X-ray and neutron scattering to study the effects of CL with different acyl chain lengths and saturations (CL14:0, CL18:1, CL18:2) on vesicle morphology and lamellarity in membrane models containing mixtures of phosphatidylcholine and phosphatidylethanolamine with different acyl chain lengths and saturations (C14:0 and C 18:1). Measurements were performed in the presence of Phosphate Buffer Saline (PBS), at 37°C, to better reflect physiological conditions, which resulted in strong effects on vesicle morphology, depending on the type and amount of CL used. The presence of small quantities of CL (from 2.5%) reduced inter-membrane correlations and increased perturbation of the membrane, an effect which is enhanced in the presence of matched shorter saturated acyl chains, and mainly unilamellar vesicles (ULV) are formed. In extruded vesicles, employed for SANS experiments, flattened vesicles are observed partly due to the hypertonic effect of PBS, but also influenced by the type of CL added. Our experimental data from SAXS and SANS revealed a strong dependence on CL content in shaping the membrane microstructure, with an apparent optimum in the PC:CL mixture in terms of promoting reduced correlations, preferred curvature and elongation. However, the use of PBS caused distinct differences from previously published studies in water in terms of vesicle shape, and highlights the need to investigate vesicle formation under physiological conditions in order to be able to draw conclusions about membrane formation in biological systems.

Outcomes Associated With Aortic Balloon Occlusion Time in Patients With Zone 1 Resuscitative Endovascular Balloon Occlusion of the Aorta.

INTRODUCTION: Resuscitative endovascular balloon occlusion of the aorta (REBOA) has the potential to cause clinically relevant systemic ischemic burden with long durations of aortic occlusion (AO). We aimed to examine the association between balloon occlusion time and clinical complications and mortality outcomes in patients undergoing zone 1 REBOA. METHODS: A retrospective cohort analysis of American Association for the Surgery of Trauma Aortic Occlusion for Resuscitation in Trauma and Acuteregistry patients with Zone 1 REBOA between 2013 and 2022 was performed. Patients with cardiopulmonary resuscitation on arrival or who did not survive past the emergency department were excluded. Total AO times were categorized as follows: <15 min, 15-30 min, 31-60 min, and >60 min. Clinical and procedural variables and in-hospital outcomes were compared across groups using bivariate and multivariate regression analyses. RESULTS: There were 327 cases meeting inclusion criteria (n = 51 < 15 min, 83 15-30 min, 98 31-60 min, and 95 > 60 min, respectively). AO >60 min had higher admission lactate (8 ± 6; P = 0.004) compared to all other time groups, but injury severity score, heart rate, and systolic blood pressure were similar. Group average times from admission to definitive hemorrhage control ranged from 82 to 103 min and were similar across groups (85 min in AO >60 group). Longer AO times were associated with greater red blood cell, fresh frozen plasma transfusions (P < 0.001), and vasopressor use (P = 0.001). Mortality was greatest in the >60 min group (73%) versus the <15 min, 15-30 min, and 31-60 min groups (53%, 43%, and 45%, P < 0.001). With adjustment for injury severity score, systolic blood pressure, and lactate, AO >60 min had greater mortality (OR 3.7, 95% CI 1.6-9.4; P < 0.001) than other AO duration groups. Among 153 survivors, AO >60 min had a higher rate of multiple organ failure (15.4%) compared to the other AO durations (0%, 0%, and 4%, P = 0.02). There were no differences in amputation rates (0.7%) or spinal cord ischemia (1.4%). acute kidney injury was seen in 41% of >60 min versus 21%, 27%, and 33%, P = 0.42. CONCLUSIONS: Though greater preocclusion physiologic injury may have been present, REBOA-induced ischemic insult was correlated with poor patient outcomes, specifically, REBOA inflation time >60 min had higher rates of mortality and multiple organ failure. Minimizing AO duration should be prioritized, and AO should not delay achieving definitive hemostasis. Partial REBOA may be a solution to extend safe AO time and deserves further study.

Arterial Access Complications Following Percutaneous Femoral Access in 24-Hour Resuscitative Endovascular Balloon Occlusion of the Aorta Survivors.

INTRODUCTION: With the use of resuscitative endovascular balloon occlusion of the aorta (REBOA) comes the potential for vascular access site complications (VASCs) and limb ischemic sequelae. We aimed to determine the prevalence of VASC and associated clinical and technical factors. METHODS: A retrospective cohort analysis of 24-h survivors undergoing percutaneous REBOA via the femoral artery in the American Association for the Surgery of Trauma Aortic Occlusion for Resuscitation in Trauma and Acute care surgery registry between Oct 2013 and Sep 2021 was performed. The primary outcome was VASC, defined as at least one of the following: hematoma, pseudoaneurysm, arteriovenous fistula, arterial stenosis, or the use of patch angioplasty for arterial closure. Associated clinical and procedural variables were examined. Data were analyzed using Fisher exact test, Mann-Whitney-U tests, and linear regression. RESULTS: There were 34 (7%) cases with VASC among 485 meeting inclusion criteria. Hematoma (40%) was the most common, followed by pseudoaneurysm (26%) and patch angioplasty (21%). No differences in demographics or injury/shock severity were noted between cases with and without VASC. The use of ultrasound (US) was protective (VASC, 35% versus no VASC, 51%; P = 0.05). The VASC rate in US cases was 12/242 (5%) versus 22/240 (9.2%) without US. Arterial sheath size >7 Fr was not associated with VASC. US use increased over time (R2 = 0.94, P < 0.001) with a stable rate of VASC (R2 = 0.78, P = 0.61). VASC were associated with limb ischemia (VASC, 15% versus no VASC, 4%; P = 0.006) and arterial bypass procedures (VASC 3% versus no VASC 0%; P < 0.001) but amputation was uncommon (VASC, 3% versus no VASC, 0.4%; P = 0.07). CONCLUSIONS: Percutaneous femoral REBOA had a 7% VASC rate which was stable over time. VASC are associated with limb ischemia but need for surgical intervention and/or amputation is rare. The use of US-guided access appears to be protective against VASC and is recommended for use in all percutaneous femoral REBOA procedures.

Survival benefit for pelvic trauma patients undergoing Resuscitative Endovascular Balloon Occlusion of the Aorta: Results of the AAST Aortic Occlusion for Resuscitation in Trauma Acute Care Surgery (AORTA) Registry.

BACKGROUND: Aortic occlusion (AO) to facilitate the acute resuscitation of trauma and acute care surgery patients in shock remains a controversial topic. Resuscitative Endovascular Balloon Occlusion of the Aorta (REBOA) is an increasingly deployed method of AO. We hypothesized that in patients with non-compressible hemorrhage below the aortic bifurcation, the use of REBOA instead of open AO may be associated with a survival benefit. METHODS: From the AAST Aortic Occlusion for Resuscitation in Trauma and Acute Care Surgery (AORTA) registry, we identified 1494 patients requiring AO from 45 Level I and 4 Level II trauma centers. Presentation, intervention, and outcome variables were analyzed to compare REBOA vs open AO in patients with non-compressible hemorrhage below the aortic bifurcation. RESULTS: From December 2014 to January 2019, 217 patients with Zone 3 REBOA or Open AO who required pelvic packing, pelvic fixation or pelvic angio-embolization were identified. Of these, 109 AO patients had injuries isolated to below the aortic bifurcation (REBOA, 84; open AO, 25). Patients with intra-abdominal or thoracic sources of bleeding, above deployment Zone 3 were excluded. Overall mortality was lower in the REBOA group (35.% vs 80%, p <.001). Excluding patients who arrived with CPR in progress, the REBOA group had lower mortality (33.33% vs. 68.75%, p = 0.012). Of the survivors, systemic complications were not significantly different between groups. In the REBOA group, 16 patients had complications secondary to vascular access. Intensive care lengths of stay and ventilator days were both significantly shorter in REBOA patients who survived to discharge. CONCLUSIONS: This study compared outcomes for patients with hemorrhage below the aortic bifurcation treated with REBOA to those treated with open AO. Survival was significantly higher in REBOA patients compared to open AO patients, while complications in survivors were not different. Given the higher survival in REBOA patients, we conclude that REBOA should be used for patients with hemorrhagic shock secondary to pelvic trauma instead of open AO. LEVEL III EVIDENCE: Therapeutic.

Life over limb: Arterial access-related limb ischemic complications in 48-hour REBOA survivors.

BACKGROUND: Resuscitative endovascular balloon occlusion of the aorta (REBOA) is increasingly used in some trauma settings. Arterial access-related limb ischemic complications (ARLICs) resulting from the femoral arterial access required for REBOA are largely under reported. We sought to describe the incidence of these complications and the clinical, technical, and device factors associated with their development. METHODS: This was a retrospective cohort study of records of adult trauma patients from the American Association for the Surgery of Trauma Aortic Occlusion for Resuscitation in Trauma and Acute care surgery registry between October 2013 and September 2020 who had REBOA and survived at least 48 hours. The primary outcome was ARLIC, defined as clinically relevant extremity ischemia or distal embolization. Relevant factors associated with ARLIC were also analyzed. RESULTS: Of 418 identified patients, 36 (8.6%) sustained at least one ARLIC; 22 with extremity ischemia, 25 with distal embolism, 11 with both. Patient demographics and injury characteristics were similar between ARLIC and no ARLIC groups. Access-related limb ischemic complication was associated with larger profile devices (p = 0.009), cutdown access technique (p = 0.02), and the presence of a pelvic external fixator/binder (p = 0.01). Patients with ARLIC had higher base deficit (p = 0.03) and lactate (p = 0.006). One hundred fifty-six patients received tranexamic acid (TXA), with 22 (14%) ARLICs. The rate of TXA use among ARLIC patients was 61% (vs. 35% TXA for non-ARLIC patients, p = 0.002). Access-related limb ischemic complication did not result in additional in-hospital mortality, however, ARLIC had prolonged hospital LOS (31 vs. 24 days, p = 0.02). Five ARLIC required surgical intervention, three patch angioplasty (and two with associated bypass), and four ARLIC limbs were amputated. CONCLUSION: Femoral artery REBOA access carries a risk of ARLIC, which is associated with unstable pelvis fractures, severe shock, and strongly with the administration of TXA. Use of lower-profile devices and close surveillance for these complications is warranted in these settings and caution should be exercised when using TXA in conjunction with REBOA. LEVEL OF EVIDENCE: Prognostic and Epidemiologic, Level III.

Extracorporeal support for trauma: A trauma quality improvement project (TQIP) analysis in patients with acute respiratory distress syndrome.

INTRODUCTION: The use of extracorporeal membrane oxygenation (ECMO) in trauma patients with severe acute respiratory distress syndrome (ARDS) continues to evolve. The objective of this study was to perform a comparative analysis of trauma patients with ARDS who received ECMO to a propensity matched cohort of patients who underwent conventional management. METHODS: The Trauma Quality Improvement Program (TQIP) database was queried from 2013 to 2016 for all patients with ARDS and those who received ECMO. Demographics, as well as clinical, injury, intervention, and outcome data were collected and analyzed. Patients with ARDS were divided into two groups, those who received ECMO and those who did not. A propensity score analysis was performed using the following criteria: age, gender, vital signs (HR, SBP) and GCS on admission, Injury Severity Score (ISS), and Abbreviated Injury Scale (AIS) score in several body regions. Outcomes between the groups were subsequently compared using univariate as well as Cox regression analyses. Secondary outcomes such as hospitalization (HLOS), ICU length-of-stay (LOS) and ventilation days stratified for patient demographics, timing of ECMO and anticoagulation status were compared. RESULTS: Over the 3-year study period, 8990 patients with ARDS were identified from the TQIP registry. Following exclusion, 3680 were included in the final analysis, of which 97 (2.6%) received ECMO. On univariate analysis following matching, patients who underwent ECMO had lower overall hospital mortality (23 vs 50%, p < 0.001) with higher rates of complications (p < 0.005), including longer HLOS. In those undergoing ECMO, early initiation (<7 days) was associated with shorter HLOS, ICU LOS, and fewer ventilator days. No difference was observed between the two groups with regard to anticoagulation. CONCLUSION: Extracorporeal membrane oxygenation use in trauma patients with ARDS may be associated with improved survival, especially for young patients with thoracic injuries, early in the course of ARDS. Anticoagulation while on circuit was not associated with increased risk of hemorrhage or mortality, even in the setting of head injuries. The mortality benefit suggested with ECMO comes at the expense of a potential increase in complication rate and prolonged hospitalization.

Evaluation of the efficacy of commercial and noncommercial tourniquets for extremity hemorrhage control in a perfused cadaver model.

BACKGROUND: Tourniquets are a critical tool in the immediate response to life-threatening extremity hemorrhage; however, the optimal tourniquet type and effectiveness of noncommercial devices remain unclear. Our aim was to evaluate the efficacy of five tourniquets in a perfused-cadaver model. METHODS: This prospective study used a perfused-cadaver model with standardized superficial femoral artery injury bleeding at 700 mL/min. Five tourniquets were tested: combat application tourniquet; rapid application tourniquet system; Stretch, Wrap, And Tuck Tourniquet; an improvised triangle bandage windlass; and a leather belt. Forty-eight medical students underwent a practical hands-on demonstration of each tourniquet. Using a random number generator, they placed the tourniquets on the bleeding cadaver in random order. Time to hemostasis, time to secure devices, estimated blood loss, and difficulty rating were assessed. A one-way repeated measures analysis of variance was used to compare efficacy between the tourniquets in achieving the outcomes. RESULTS: The mean ± SD participant age was 25 ± 2.6 years, and 29 (60%) were male. All but one tourniquet was able to stop bleeding, but the rapid application tourniquet system had a 4% failure rate. Time to hemostasis and estimated blood loss did not differ significantly (p > 0.05). Stretch, Wrap, And Tuck Tourniquet required the longest time to be secured (47.8 ± 17.0 seconds), whereas the belt was the fastest (15.2 ± 6.5 seconds; p < 0.001). The improvised windlass was rated easiest to learn and apply, with 22 participants (46%) assigning a score of 1. CONCLUSION: Four of five tourniquets evaluated, including both noncommercial devices, effectively achieved hemostasis. A standard leather belt was the fastest to place and was able to stop the bleeding. However, it required continuous pressure to maintain hemostasis. The improvised windlass was as effective as the commercial devices and was the easiest to apply. In an emergency setting where commercial devices are not available, improvised tourniquets may be an effective bridge to definitive care.

Predictors of retained hemothorax in trauma: Results of an Eastern Association for the Surgery of Trauma multi-institutional trial.

BACKGROUND: The natural history of traumatic hemothorax (HTX) remains unclear. We aimed to describe outcomes of HTX following tube thoracostomy drainage and to delineate factors that predict progression to a retained hemothorax (RH). We hypothesized that initial large-volume HTX predicts the development of an RH. METHODS: We conducted a prospective, observational, multi-institutional study of adult trauma patients diagnosed with an HTX identified on computed tomography (CT) scan with volumes calculated at time of diagnosis. All patients were managed with tube thoracostomy drainage within 24 hours of presentation. Retained hemothorax was defined as blood-density fluid identified on follow-up CT scan or need for additional intervention after initial tube thoracostomy placement for HTX. RESULTS: A total of 369 patients who presented with an HTX initially managed with tube thoracostomy drainage were enrolled from 17 trauma centers. Retained hemothorax was identified in 106 patients (28.7%). Patients with RH had a larger median (interquartile range) HTX volume on initial CT compared with no RH (191 [48-431] mL vs. 88 [35-245] mL, p = 0.013) and were more likely to be older with a higher burden of thoracic injury. After controlling for significant differences between groups, RH was independently associated with a larger HTX on presentation, with a 15% increase in risk of RH for each additional 100 mL of HTX on initial CT imaging (odds ratio, 1.15; 95% confidence interval, 1.08-1.21; p < 0.001). Patients with an RH also had higher rates of pneumonia and longer hospital length of stay than those with successful initial management. Retained hemothorax was also associated with worse functional outcomes at discharge and first outpatient follow-up. CONCLUSION: Larger initial HTX volumes are independently associated with RH, and unsuccessful initial management with tube thoracostomy is associated with worse patient outcomes. Future studies should use this experience to assess a range of options for reducing the risk of unsuccessful initial management. LEVEL OF EVIDENCE: Therapeutic/care management study, level III.

Adjunctive use of hepatic angioembolization following hemorrhage control laparotomy.

BACKGROUND: Severe liver injuries pose a challenge to trauma surgeons. While the use of hepatic angioembolization (HAE) has been evaluated as a component of the nonoperative management of liver injury, little is known about the efficacy of postoperative HAE in patients who require hemorrhage control laparotomy (HCL) for liver injury. The purpose of this study is to evaluate the impact of HAE following HCL on patient survival. METHODS: This is a retrospective cohort study using the American College of Surgeons Trauma Quality Improvement Program database from January 2013 to December 2014. In propensity score matched (2:1) patients who underwent HCL-only or HCL + HAE, the impact of adjunctive use of HAE on patient survival was examined with the Cox proportional hazards regression analysis adjusting for transfusion requirement within 4 hours. We also performed a subgroup analysis in patients without severe traumatic brain injury (Abbreviated Injury Scale head ≤3). RESULTS: A total of 1,675 patients met our inclusion criteria. Of those, 75 (4.5%) patients underwent HAE after HCL (median hours to HAE, 5 hours after admission). In 225 propensity score-matched patients, the use of HAE following HCL was significantly associated with improved 24-hour mortality, but not in-hospital mortality. In the subgroup of patients without severe traumatic brain injury (n = 189), we observed significant survival benefits (24-hour and in-hospital mortality) associated with the adjunctive use of HAE. CONCLUSION: The results of our study suggest that the adjunctive use of HAE might improve survival of patients who require HCL for liver injury. Further prospective study to determine the indication for postoperative HAE is still warranted. LEVEL OF EVIDENCE: Therapeutic study, level III.

Intraoperative REBOA: an analysis of the American Association for the Surgery of Trauma AORTA registry.

BACKGROUND: Resuscitative endovascular balloon occlusion of the aorta (REBOA) is a less-invasive technique for aortic occlusion (AO). Commonly performed in the emergency department (ED), the role of intraoperative placement is less defined. We hypothesized that operating room (OR) placement is associated with increased in-hospital mortality. METHODS: The American Association for the Surgery of Trauma AORTA registry was used to identify patients undergoing REBOA. Injury characteristics and outcomes data were compared between OR and ED groups. The primary outcome was in-hospital mortality; secondary outcomes included total AO time, transfusion requirements, and acute kidney injury. RESULTS: Location and timing of catheter insertion were available for 305 of 321 (95%) subjects. 58 patients underwent REBOA in the OR (19%). There were no differences with respect to sex, admission lactate, and Injury Severity Score. The OR group was younger (33 years vs. 41 years, p=0.01) and with more penetrating injuries (36% vs. 15%, p<0.001). There were significant differences with respect to admission physiology. Time from admission to AO was longer in the OR group (75 minutes vs. 23 minutes, p<0.001) as was time to definitive hemostasis (116 minutes vs. 79 minutes, p=0.01). Unadjusted mortality was lower in the OR group (36.2% vs. 68.8%, p<0.001). There were no differences in secondary outcomes. After controlling for covariates, there was no association between insertion location and in-hospital mortality (OR 1.8, 95% CI 0.30 to 11.50). DISCUSSION: OR REBOA placement is common and generally employed in patients with more stable admission physiology. OR placement was not associated with increased in-hospital mortality despite longer times to AO and definite hemostasis when compared with catheters placed in the ED. LEVEL OF EVIDENCE: IV; therapeutic/care management.

Selective nonoperative management of renal gunshot wounds.

BACKGROUND: Selective nonoperative management (SNOM) of blunt kidney injuries has been the standard of care for decades. However, the role of SNOM after renal gunshot wounds (GSWs) remains unclear. The purpose of this study was to assess the safety and outcomes of SNOM of renal GSWs at a national level. METHODS: The National Trauma Data Bank was queried for patients who sustained a GSW to the kidney (January 2007 to December 2014). Patients with emergency department death, transfer, nonsurvivable (Abbreviated Injury Scale score = 6) injuries, absent vitals on arrival, associated hollow viscus or major abdominal vascular injury, or missing procedure/discharge data were excluded. Study groups were defined according to management strategy, with operative management (OM) defined as laparotomy 4 hours or less from admission and SNOM defined by the lack of laparotomy 4 hours or less from admission. Demographics, injury data, and outcomes (mortality, complications, need for nephrectomy, failure of SNOM [defined as laparotomy 5-72 hours after admission], and hospital length of stay [LOS]) were collected. Logistic regression compared outcomes between SNOM and OM. RESULTS: Over the study period, 1,329 patients met inclusion and exclusion criteria. Of these, 459 (34.5%) underwent SNOM (38.6% of American Association for the Surgery of Trauma kidney injury grades I-II, 39.4% of grade III, 24.0% of grade IV, and 5.2% of grade V). SNOM was associated with significantly shorter hospital LOS (6 days vs. 9 days, p < 0.001). Failure of SNOM occurred in 10.2%. Logistic regression showed no association between SNOM and mortality (odds ratio [OR], 0.614, p = 0.244). However, SNOM was independently associated with fewer complications (OR, 0.711; p = 0.008) and a reduction in need for nephrectomy (OR, 0.056; p < 0.001). CONCLUSION: SNOM of GSWs to the kidney has become a common practice in the United States. It is safe and has a high success rate, even in severe kidney injuries. It decreases hospital LOS and is independently associated with fewer complications and reduced need for nephrectomy. LEVEL OF EVIDENCE: Therapeutic/Care Management, level IV.

Early Venous Thromboembolism Prophylaxis for Isolated High-Grade Blunt Splenic Injury.

BACKGROUND: Nonoperative management (NOM) has become more common in hemodynamically stable patients with high-grade blunt splenic injury. However, there are no widely accepted guidelines for an optimal and safe timeframe for the initiation of venous thromboembolism (VTE) prophylaxis. The purpose of this study was to explore the association between the timing of VTE prophylaxis initiation and NOM failure rate in isolated high-grade blunt splenic injury. METHODS: We utilized the American College of Surgeons Trauma Quality Improvement Program database (2013-2014) to identify adult patients who underwent NOM for isolated high-grade blunt splenic injuries (grades 3-5). The incidence of NOM failure after the initiation of VTE prophylaxis was compared between two groups: VTE prophylaxis <48 h after admission (early prophylaxis group), and ≥48 h (late prophylaxis group). RESULTS: A total of 816 patients met the inclusion criteria. Of those, VTE prophylaxis was not administered in 525 patients (64.3%), whereas VTE prophylaxis was given <48 h and ≥48 h after admission in 144 and 147 patients, respectively. There was no significant difference in the NOM failure rate after the initiation of VTE prophylaxis between the early and late prophylaxis groups (3.5% versus 3.4%, P = 1.00). In the multiple logistic regression analysis, early initiation of VTE prophylaxis was not significantly associated with NOM failure (OR: 1.32, 95% CI 0.35-4.93, P = 0.68). CONCLUSIONS: The results of our study suggest that early initiation of VTE prophylaxis (<48 h) does not increase the risk of NOM failure in patients with isolated high-grade blunt splenic injury.

Gunshot wounds to the liver: No longer a mandatory operation.

BACKGROUND: Selective nonoperative management (SNOM) of gunshot wounds (GSWs) to the liver is a contemporary management strategy that remains controversial. This study examined national trends and outcomes after SNOM versus operative management (OM) of hepatic GSWs. METHODS: The National Trauma Data Bank was used to identify patients who sustained an isolated GSW to the liver (2007-2014). Patients with emergency department death, transfer, or associated hollow viscus or major abdominal vascular injury were excluded. The defined study groups were SNOM versus OM, with SNOM specified as patients who did not undergo laparotomy within 4 hours of admission. Outcomes included mortality and complications. Logistic regression was used to compare outcomes between groups. RESULTS: A total of 4,031 patients were included, with 38.8% (n = 1,564) undergoing SNOM and 61.2% (n = 2,467) undergoing OM. The rate of SNOM increased over time, from 34.5% to 41.0% (p = 0.004). By the American Association for the Surgery of Trauma liver injury grade, SNOM was used in 45.0% of grades I and II, 40.6% of grade III, 27.3% of grade IV, and 16.7% of grade V injuries. On regression analysis, SNOM was independently associated with fewer complications (odds ratio [OR], 0.811; p = 0.003) and lower mortality (OR, 0.438; p < 0.001). On subgroup analysis, patients with grade IV injury were most likely to benefit from SNOM with fewer complications (OR, 0.676; p = 0.019) and improved mortality (OR, 0.238; p = 0.002). CONCLUSION: Selective nonoperative management of GSW to the liver has gained acceptance in the United States. Selective nonoperative management is independently associated with improved survival and decreased complications. In the appropriate clinical scenario, SNOM is a safe and effective method for treating hepatic GSWs. LEVEL OF EVIDENCE: Therapeutic/care management, level III.

Complicated appendicitis: Immediate operation or trial of nonoperative management?

BACKGROUND: The optimal treatment for complicated appendicitis remains controversial. We sought to compare clinical outcomes of patients with complicated appendicitis treated with an immediate operation or a trial of nonoperative management. METHODS: Adult patients (≥18 years) with complicated appendicitis were included. Patient characteristics and outcomes were compared between the immediate operation group and the nonoperative management group. RESULTS: A total of 101 patients met our inclusion criteria. Of those, 36 patients received an initial trial of nonoperative management with an 86.1% success rate. Patients who failed nonoperative management required significantly longer hospital stays than those in the immediate operation group (11 vs. 5 days). An immediate operation was performed in 65 patients. Open surgery was required in 9 patients (13.8%). Postoperatively, 7 patients (10.8%) required percutaneous drainage of intraabdominal abscess. CONCLUSIONS: Nonoperative management was successful in the majority of patients with complicated appendicitis, whereas failure of nonoperative management was associated with prolonged hospital stay. Patients who underwent an immediate operation often required percutaneous drainage of intraabdominal abscess.

Outcomes and indications for emergency thoracotomy after adoption of a more liberal policy in a western European level 1 trauma centre: 8-year experience.

The role of emergency thoracotomy (ET) in blunt trauma is still a matter of debate and in Europe only a small number of studies have been published. We report our experience about ET both in penetrating and blunt trauma, discussing indications, outcomes and proposing an algorithm for patient selection. We retrospectively analysed patients who underwent ET at Maggiore Hospital Trauma Center over two periods: from January 1st, 2010 to December 31st, 2012, and from January 1st, 2013 to May 31st, 2017. Demographic and clinical data, mechanism of injury, Injury Severity Score, site of injury, time of witnessed cardiac arrest, presence/absence of signs of life, length of stay were considered, as well as survival rate and neurological outcome. 27 ETs were performed: 21 after blunt trauma and 6 after penetrating trauma. Motor vehicle accident was the main mechanism of injury, followed by fall from height. The mean age was 40.5 years and the median Injury Severity Score was of 40. The most frequent injury was cardiac tamponade. The overall survival rate was 10% during the first period and 23.5% during the second period, after the adoption of a more liberal policy. No long-term neurological sequelae were reported. The outcomes of ET in trauma patient, either after penetrating or blunt trauma, are poor but not negligible. To date, only small series of ET from European trauma centres have been published, although larger series are available from USA and South Africa. However, in selected patients, all efforts must be made for the patient's survival; the possibility of organ donation should be taken into consideration as well.

Effect of door-to-angioembolization time on mortality in pelvic fracture: Every hour of delay counts.

INTRODUCTION: Angioembolization (AE) is widely used for hemorrhagic control in patients with pelvic fracture. The latest version of the Resources for Optimal Care of the Injured Patient issued by the American College of Surgeons Committee on Trauma requires interventional radiologists to be available within 30 minutes to perform an emergency AE. However, the impact of time-to-AE on patient outcomes remains unknown. We hypothesized that a longer time-to-AE would be significantly associated with increased mortality in patients with pelvic fracture. METHODS: This is a 2-year retrospective cohort study using the American College of Surgeons Trauma Quality Improvement Program database from January 2013 to December 2014. We included adult patients (age ≥ 18 years) with blunt pelvic fracture who underwent pelvic AE within 4 hours of hospital admission. Patients who required any hemorrhage control surgery for associated injuries within 4 hours were excluded. Hierarchical logistic regression was performed to evaluate the impact of time-to-AE on in-hospital and 24-hour mortality. RESULTS: A total of 181 patients were included for analysis. The median age was 54 years (interquartile range, 38-68) and 69.6% were male. The median injury severity score was 34 (interquartile range, 27-43). Overall in-hospital mortality rate was 21.0%. The median packed red blood cell transfusions within 4 and 24 hours after admission were 4 and 6 units, respectively. After adjusting for other covariates in a hierarchical logistic regression model, a longer time-to-pelvic AE was significantly associated with increased in-hospital mortality (odds ratio, 1.79 for each hour; 95% confidence interval, 1.11-2.91; p = 0.018). CONCLUSION: The current study showed an increased risk of in-hospital mortality related to a prolonged time-to-AE for hemorrhagic control following pelvic fractures. Our results suggest that all trauma centers should allocate resources to minimize delays in performing pelvic AE. LEVEL OF EVIDENCE: Therapeutic/care management, level IV.

Laparoscopy for Trauma and the Changes in its Use From 1990 to 2016: A Current Systematic Review and Meta-Analysis.

BACKGROUND: The role of laparoscopy in the diagnosis and treatment of stable abdominal trauma patients is still a matter of serious debate and only incomplete data are available. MATERIALS AND METHODS: We performed a systematic review and meta-analysis of the literature between January 1990 and August 2016. RESULTS: Overall, 9817 laparoscopies were performed for abdominal trauma; only 26.2% of the cases were converted to a laparotomy. The incidence of therapeutic laparotomies showed a reduction from 69% to 47.5%, whereas the incidence of therapeutic laparoscopies increased from 7.2% to 22.7%.The overall perioperative mortality rate was significantly lower in the laparoscopy group [odds ratio (M-H, random); 95% confidence interval, 0.35 (0.26-0.48)]. The same group showed shorter length of hospital stay [odds ratio (M-H, random); 95% confidence interval, -3.48 (-8.91 to 1.96)]. CONCLUSIONS: This systematic review shows a significant decrease in the use of laparoscopy in trauma patients. Most likely the widespread use of imaging techniques allows a more accurate selection of patients for diagnostic laparoscopy. Infact, a reduction in incidence of nontherapeutic laparotomies is evident in these selected patients undergoing diagnostic laparoscopy. Moreover, the literature reported an increasing trend of therapeutic laparoscopy, demonstrating that it is safe and effective. The small number and poor quality of the studies identified, the retrospective observational nature of the studies (low level of evidence), the high risk of bias, and the high heterogeneity of some outcomes make the applicability of the results of this meta-analysis unclear.