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Background Although cervical spine CT (CSCT) accurately detects bony injuries, it may not identify all soft tissue injuries. Although some clinicians rely exclusively on a negative CT to remove spine precautions in unevaluable patients or patients with cervicalgia, others use MRI for that purpose. The objective of this study was to determine the rates of abnormal MRI after a negative CSCT. Methods Blunt trauma patients who either were unevaluable or had persistent midline cervicalgia and underwent an MRI of the C-spine after a negative CSCT were enrolled prospectively in eight Level I and II New England trauma centers. Demographics, injury patterns, CT and MRI results, and any changes in cervical spine management as a result of MRI imaging were recorded. Results A total of 767 patients had MRI because of cervicalgia (43.0%), inability to evaluate (44.1%), or both (9.4%). MRI was abnormal in 23.6% of all patients, including ligamentous injury (16.6%), soft tissue swelling (4.3%), vertebral disc injury (1.4%), and dural hematomas (1.3%). Rates of abnormal neurological signs or symptoms were not different among patients with normal versus abnormal MRI. (15.2 vs. 18.8%, p = 0.25). The c-collar was removed in 88.1% of patients with normal MRI and 13.3% of patients with an abnormal MRI. No patient required halo placement, but 11 patients underwent cervical spine surgery after the MRI results. Six of the eleven had neurological signs or symptoms. Conclusions In a select population of patients, MRI identified additional injuries in 23.6% of patients despite a normal CSCT. It is uncertain if this is a true limitation of CT technology or represents subtle injuries missed in the interpretation of the scan. The clinical significance of these abnormal MRI findings cannot be determined from this study group. Level of evidence Therapeutic study, level IV.

Current methods for the diagnosis of sepsis have insufficient precision, causing regular misdiagnoses. Microbiological tests can help to diagnose sepsis, but are usually too slow to have an impact on timely clinical decision-making. Neutrophils have a high sensitivity to infections, yet measurements of neutrophil surface markers, genomic changes and phenotype alterations have had only a marginal effect on sepsis diagnosis. Here, we report a microfluidic assay that measures, from one droplet of diluted blood, the spontaneous motility of neutrophils in the presence of plasma. We measured the performance of the assay in two independent cohorts of critically ill patients suspected of sepsis. Using data from a first cohort, we developed a machine-learning-based scoring system (sepsis score) that segregated patients with sepsis from those without sepsis. We then validated the sepsis score in a double-blind, prospective case–control study. For the 42 patients across the two cohorts, the assay identified sepsis patients with 97% sensitivity and 98% specificity. The neutrophil assay could potentially be used to accurately diagnose and monitor sepsis in larger populations of at-risk patients.

Hypophosphatemia has been associated with refeeding malnourished patients, but its clinical significance is unclear. We investigated the incidence of refeeding hypophosphatemia (RH) in the surgical intensive care unit (SICU) and its association with early enteral nutrition (EN) administration and clinical outcomes.We performed a retrospective review of a 2-year database of patients receiving EN in the SICU. RH was defined as a post-EN phosphorus (PHOS) level decrement of0.5 mg/dL to a nadir2.0 mg/dL within 8 days from EN initiation. We investigated the risk factors for RH and examined its association with clinical outcomes using multivariable regression analyses.In total, 213 patients comprised our analytic cohort. Eighty-three of 213 (39%) individuals experienced RH and 43 of 130 (33%) of the remaining patients experienced non-RH hypophosphatemia (nadir PHOS level2.0 mg/dL). Overall, there was a total 59% incidence of hypophosphatemia of any cause (N = 126). Nutrition parameters did not differ between groups; most patients were initiated on EN within 48 hours of SICU admission, and timing of EN initiation was not a significant predictor for the development of RH. The median hospital length of stay (LOS) was 21 and 24 days for those with and without RH, respectively (P = .79); RH remained a nonsignificant predictor for hospital LOS in the multivariable analysis.RH is common in the SICU but is not related to timing or amount of EN. Hypophosphatemia is also common in the critically ill, but regardless of etiology, it was not found to be a predictor of worse clinical outcomes.

Background Patient instability and limited radiology staffing may compel surgeons to make clinical decisions based on their independent interpretations of imaging studies. Despite potential implications for patients, no research to date has assessed the need for a diagnostic radiology curriculum in general surgery residency. Methods We performed a cross-sectional study of surgery faculty and residents at 13 teaching hospitals across the United States. Survey responses were summarized using frequency and percentage, and analyzed by chi-square, Mantel-Haenszel chi-square, and McNemar tests. Results Surveys were distributed to 465 faculty and 520 residents, with response rates of 26% and 30%, respectively. Most respondents reported making decisions based on their independent imaging interpretation at least sometimes, with higher frequency in acute scenarios. The majority voiced a need for a dedicated radiology curriculum, with teaching in chest x-rays, abdominal x-rays, abdominal computed tomography, chest computed tomography, and focused assessment with sonography in trauma examinations. Conclusions Surgeons and surgical residents enact treatment plans based on their independent interpretation of imaging studies, especially during acute patient scenarios. Further curricular development efforts are warranted to ensure trainee accuracy in radiologic interpretation.

Specialized proresolving lipid mediators have emerged as powerful modulators of inflammation and activators of resolution. Animal models show significant benefits of specialized proresolving lipid mediators on survival and wound healing after major burn trauma. To date, no studies have investigated specialized proresolving lipid mediators and their relation to other lipid mediator pathways in humans after trauma. Here we determine if patients with poor outcomes after trauma have dysregulated lipid mediator pathways.We studied blood leukocyte expression of 18 genes critical to the synthesis, signaling, and metabolism of specialized proresolving lipid mediators and proinflammatory lipid mediators, and we correlated these expression patterns with clinical outcomes in trauma patients from the Inflammation and the Host Response to Injury study.Seven U.S. medical trauma centers.Ninety-six patients enrolled in the Inflammation and Host Response to Injury study, after blunt trauma and unambiguously classified as having uncomplicated or complicated recoveries. Twenty-eight healthy volunteers were enrolled as controls.None.Within each patient, the 18 genes of interest were used to calculate scores for distinct families of lipid mediators, including resolvins, lipoxins, prostaglandins, and leukotrienes, as well as leukotriene to resolvin score ratios. Scores were built using a simple weighting scheme, taking into consideration both dependent and independent activities of enzymes and receptors responsible for lipid mediator biosynthesis and function. Individually, ALOX12, PTGS2, PTGES, PTGDS, ALOX5AP, LTA4H, FPR2, PTGER2, LTB4R, HPGD, PTGR1, and CYP4F3 were expressed differentially over 28 days posttrauma between patients with uncomplicated and complicated recoveries (p0.05). When all genes were combined into scores, patients with uncomplicated recoveries had differential and higher resolvin scores (p0.001) and lower leukotriene scores (p0.001). A final combined ratio was calculated for each patient, and posttrauma leukotriene score to resolvin score ratios were significantly lower in patients with uncomplicated clinical courses (p0.001).proresolving lipid mediator lipidomics and/or protein expression, and identifying associated therapeutic targets, may influence the clinical management of trauma patients.

An account of the limitations of a purely medical approach to cross-cultural service, and the leaarning that occurs by listening to what care recipients have to speak into care-giver’s lives.

Key Clinical Message Diabetes insipidus (DI) arises from impaired function of antidiuretic hormone, characterized by hypovolemia, hypernatremia, polyuria, and polydipsia. This case is a reminder of the rare but challenging obstacle that undiagnosed DI poses in fasting surgical patients, requiring prompt recognition and vigilant management of marked homeostatic imbalances.

This chapter provides a summary of the landmark study known as the PROPPR trial. How effective and safe is rapid transfusion of patients with severe traumatic hemorrhage using plasma, platelets, and red blood cells in a 1:1:1 ratio compared to a 1:1:2 ratio? Starting with that question, it describes the basics of the study, including funding, study location, who was studied, how many patients, study design, study intervention, follow-up, endpoints, results, and criticism and limitations. The chapter briefly reviews other relevant studies and information, discusses implications, and concludes with a relevant clinical case. A growing body of literature suggests that massive transfusion protocols confer mortality benefits for trauma patients in hemorrhagic shock; however, such protocols still require standardization. In the PROPPR trial, there was suggestion of improved hemostasis and less death from exsanguinations with a 1:1:1 transfusion ratio versus a 1:1:2 approach; however, further trials are warranted.

Resuscitative Thoracotomy or Emergency Department Thoracotomy (EDT) is a time-sensitive and potentially life-saving procedure. Yet, trainee experience with this procedure is often limited in both clinical and simulation settings. We sought to develop a high-fidelity EDT simulation module and assessment tool to facilitate trainee education.Using the Kern model for curricular development, a group of expert trauma surgeons identified EDT as a high-stakes, low-frequency procedure. Task analysis identified 5 key steps of EDT: (1) opening chest/rib spreader utilization; (2) pericardiotomy/cardiac repair; (3) open cardiac massage; (4) clamping aorta; and (5) control of pulmonary hilum. A high-fidelity simulator with beating-heart technology was built. The previously validated Objective Structured Assessment of Technical Skills (OSATS) was adapted to create the "EDT-OSATS" which assessed performance along several domains: (1) Surgical technique (key steps); (2) general skills; and (3) global rating. A pilot test was performed to compare board-certified trauma surgeons (i.e., Experts) with categorical general surgery interns (i.e., Novices). Each subject received preparatory materials, completed a presimulation quiz, performed a videotaped procedure on the EDT simulator, and completed a postmodule survey. Two independent raters scored performances using the EDT-OSATS. Groups were compared in descriptive and unadjusted analyses. We hypothesized that our EDT simulation module would distinguish between expert vs novice performance and improve trainee confidence.Simulation laboratory at Massachusetts General Hospital in Boston, MA.Trauma surgeons (Experts, n = 6) and categorical general surgery interns (Novices, n = 8).Experts scored significantly higher than Novices on nearly all components of the EDT-OSATS, including: (1) surgical technique: pericardiotomy (4.2 vs 3.4, p = 0.040), cardiac massage (3.6 vs 2.4, p = 0.028), clamping aorta (4.1 vs 3.3, p = 0.035), control of pulmonary hilum (4.8 vs 3.4, p0.001); (2) general skills: time/motion (4.1 vs 2.9, p = 0.011), knowledge and handling of instruments (4.3 vs 3.1, p = 0.004), and (3) global rating (3.9 vs 2.9, p = 0.026). There was no statistical difference between groups on opening chest/rib spreader utilization (3.8 vs 3.3, p = 0.352) or procedure time (204sec vs 227sec, p = 0.401), though Experts scored numerically higher than Novices on every measure. Novices reported significantly increased confidence after the simulation (3.1 vs 1.4, p = 0.001). Ninety-three percent (13/14) of participants found the simulator realistic.Our novel high-fidelity beating-heart EDT simulator is realistic and improves trainee confidence in this low-frequency, high-stakes emergency procedure. The EDT-OSATS tool differentiates between performances of experienced surgeons vs novice trainees on the beating-heart simulator. This training module and accompanying assessment instrument hold promise as a learning tool for clinicians who may perform emergency department thoracotomy.

Venous thromboembolism (VTE) poses unique diagnostic and therapeutic dilemmas in the intensive care unit (ICU). Immobility, inflammatory states, and trauma uniquely predispose surgical ICU patients to deep vein thrombosis and pulmonary embolism. Concurrently, the risks of perioperative and traumatic bleeding complicate management of VTE, with anticoagulation contraindicated in many scenarios. This review surveys the latest evidence in the diagnosis and management of VTE among critically ill surgical patients. It discusses evidence-based guidelines regarding diagnostic imaging, anticoagulation, prophylaxis, inferior vena cava filters, non–vitamin K oral anticoagulants, and surgical and catheter-based therapies. The review also examines the special challenges encountered when treating multisystem trauma patients. Key words: anticoagulation therapy, deep vein thrombosis, pharmacoprophylaxis, pulmonary embolism, venous thromboembolism

Perforated or phlegmonous appendicitis is often treated with antibiotics and drainage as needed. The rationale, risk of recurrence, timing, or even the necessity of subsequent elective interval appendectomy (IA) is debated. We retrospectively reviewed all appendectomies performed at Beth Israel Deaconess Medical Center between 1997 and 2011. We determined if the appendix was removed emergently or as IA. Demographic characteristics, hospital length of stay, computed tomography (CT) results, and operation type (open or laparoscopic) were determined. In IA specimens, narrative pathology reports were assessed for evidence of anatomic, acute, or chronic abnormality. A total of 3562 patients had their appendix removed during this time period. Thirty-four patients were identified as having IA. Of these, only three (8.8%) had a pathologically normal appendix. All three patients were female and all had initially abnormal CTscans. Eight specimens (23.5%) had evidence of chronic and 10 (29.4%) had evidence of acute appendicitis. An additional 10 (29.4%) specimens contained a combination of acute and chronic inflammation. Mean time to operation in the IA group was 57.1 days (range, nine to 234 days) after index diagnosis by CTscan. Given the high percentage of IA specimens with acute or chronic appendicitis and the extremely high proportion (91%) of patients with pathologically abnormal specimens, it appears that IA may be justified in most cases.

Trauma, acute care surgery, and critical care have been interlinked for over a century. The field of critical care arose during the Crimean War of the 1850s, when Florence Nightingale dedicated a separate treatment area to the most severely wounded soldiers [1]. Although anesthesiologists, pulmonologists, and emergency medicine physicians also staff intensive care units (ICUs), mastery of critical care principles remains fundamental to an acute care surgeon’s practice. As a single chapter cannot accommodate the breadth of the critical care literature, we focus here on content most relevant to the acute care surgeon: resuscitation and respiratory support.

We sought to assess the impact of intraoperative adverse events (iAEs) on 30-day postoperative mortality, 30-day postoperative morbidity, and postoperative length of stay (LOS) among patients undergoing abdominal surgery. We hypothesized that iAEs would be associated with significant increases in each outcome.The relationship between iAEs and postoperative clinical outcomes remains largely unknown.The 2007 to 2012 institutional ACS-NSQIP and administrative databases for abdominal surgeries were matched then screened for iAEs using the Agency for Healthcare Research and Quality's 15 Patient Safety Indicator, "Accidental Puncture/Laceration". Each chart flagged during the initial screen was then manually reviewed to confirm whether an iAE occurred. Univariate then multivariable logistic regression models were constructed to assess the independent impact of iAEs on 30-day mortality, 30-day morbidity, and prolonged (≥7 days) postoperative LOS, controlling for preoperative/intraoperative variables (eg, age, comorbidities, ASA, wound classification), procedure type (eg, laparoscopic vs open, intestinal, foregut, hepatopancreaticobiliary vs abdominal wall procedure), and complexity (eg, adhesions; relative value units). Propensity score analyses were conducted with each iAE patient matched with 5 non-iAE patients. Sensitivity analyses were performed.A total of 9288 cases were included; 183 had iAEs. Most iAEs consisted of bowel (44%) or vessel (29%) injuries and were addressed intraoperatively (92%). In multivariable analyses, iAEs were independently associated with increased 30-day mortality [OR = 3.19, 95% confidence interval (CI) 1.52-6.71, P = 0.002], 30-day morbidity (OR = 2.68, 95% CI 1.89-3.81, P0.001), and prolonged postoperative LOS (OR = 1.85, 95% CI 1.27-2.70, P = 0.001). Postoperative complications associated with iAEs included deep/organ-space surgical site infection (OR = 1.94, 95% CI 1.20-3.14), P = 0.007), sepsis (OR = 2.14, 95% CI 1.32-3.47, P = 0.002), pneumonia (OR = 2.18, 95% CI 1.11-4.26, P = 0.023), and failure to wean ventilator (OR = 3.88, 95% CI 2.17-6.95, P0.001). Propensity score matching confirmed these findings, as did multiple sensitivity analyses.iAEs are independently associated with substantial increases in postoperative mortality, morbidity, and prolonged LOS. Quality improvement efforts should focus on iAE prevention, mitigation of harm after iAEs occur, and risk/severity-adjusted iAE tracking and benchmarking.

Emergency Cricothyroidotomy (CCT) is a surgical procedure performed to secure a patient's airway. This high-stakes, but seldom-performed procedure is an ideal candidate for a virtual reality simulator to enhance physician training. For the first time, this study characterizes the force/torque characteristics of the cricothyroidotomy procedure, to guide development of a virtual reality CCT simulator for use in medical training. We analyze the upper force and torque thresholds experienced at the human-scalpel interface. We then group individual surgical cuts based on style of cut and cut medium and perform a regression analysis to create two models that allow us to predict the style of cut performed and the cut medium.

Objective Optimal methods for medical student assessment in surgery remain elusive. Faculty- and housestaff-written evaluations constitute the chief means of student assessment in medical education. However, numerous studies show that this approach has poor specificity and a high degree of subjectivity. We hypothesized that an objective structured clinical examination (OSCE) in the surgery clerkship would provide additional data on student performance that would confirm or augment other measures of assessment. Design We retrospectively reviewed data from OSCEs, National Board of Medical Examiners shelf examinations, oral presentations, and written evaluations for 51 third-year Harvard Medical School students rotating in surgery at Massachusetts General Hospital from 2014 to 2015. We expressed correlations between numeric variables in Pearson coefficients, stratified differences between rater groups by one-way analysis of variance, and compared percentages with 2-sample t-tests. We examined commentary from both OSCE and clinical written evaluations through textual analysis and summarized these results in percentages. Results OSCE scores and clinical evaluation scores correlated poorly with each other, as well as with shelf examination scores and oral presentation grades. Textual analysis of clinical evaluation comments revealed a heavy emphasis on motivational factors and praise, whereas OSCE written comments focused on cognitive processes, patient management, and methods to improve performance. Conclusions In this single-center study, an OSCE provided clinical skills data that were not captured elsewhere in the surgery clerkship. Textual analysis of faculty evaluations reflected an emphasis on interpersonal skills, rather than appraisal of clinical acumen. These findings suggest complementary roles of faculty evaluations and OSCEs in medical student assessment.

OBJECTIVE The relationship between baseline (i.e., pre-injury) blood pressure and trauma outcomes in elderly patients is unknown. We therefore aimed to identify the independent impact of baseline systolic blood pressure (SBP) on inpatient mortality among elderly trauma patients. METHODS The 2004 to 2014 trauma registries of two Level I Trauma Centers were linked to electronic health records then reviewed to identify patients ≥65 years old with available baseline vital signs. Baseline SBP was defined as mean outpatient SBP within 2 years before injury. Trauma SBP was defined as first SBP reading after presentation for trauma. Baseline and Trauma SBP were classified as Low (

Purpose Some General Surgery Milestones can be difficult to assess in traditional clinical settings and especially difficult to assess in junior residents. The purpose of this pilot study was to (1) develop a standardized patient (SP) scenario to assess resident performance on specific Milestones and (2) compare SP scenario Milestone performance with Clinical Competency Committee (CCC) Milestone evaluations. Methods A total of 9 categorical interns participated in a comprehensive, 4-module, SP scenario designed to evaluate and manage right upper quadrant pain. SP checklist scores (SP%) were converted to Milestone-equivalent scores for direct comparison (SP-C). Milestone scores were analyzed from 3 different sources: SP, faculty (FAC), and CCC. Interns completed course evaluations at the end of each session. Spearman’s rho was used to determine correlations. Wilcoxon signed rank tests were used to test for differences between scores from different sources. Results Individual intern Milestone scores from the 3 sources (SP-C, FAC, and CCC) did not correlate. All 7 mean Milestone scores from SPs were significantly higher than from FAC and CCC. FAC and CCC scores were statistically equivalent except for Systems-Based Practice 1 (SBP1) and Patient Care 3 (PC3) where CCC scores were significantly higher than FAC. Mean SP% scores for PC1 were significantly lower than for PROF1, MK1, MK2, and ICS1 (p Conclusions Developing an SP scenario for Milestones evaluation is feasible. SPs, faculty observers, and CCC each use different data to provide a unique source of Milestone assessment. SP scenarios may be ideally suited to assess specific resident strengths and weaknesses and provide individualized feedback, thus augmenting traditional evaluations. Additional SP scenarios, assessing a broader range of skills and Milestones, are advisable for more reliable estimates of resident performance.

There currently exists no preoperative risk stratification system for emergency surgery (ES). We sought to develop an Emergency Surgery Acuity Score (ESAS) that helps predict perioperative mortality in ES patients.Using the 2011 American College of Surgeons' National Surgical Quality Improvement Program (ACS-NSQIP) database (derivation cohort), we identified all surgical procedures that were classified as "emergent." A three-step methodology was then performed. First, multiple logistic regression models were created to identify independent predictors (e.g., patient demographics, comorbidities, and preoperative laboratory variables) of 30-day mortality in ES. Second, based on the relative impact of each identified predictor (i.e., odds ratio), using weighted averages, a novel score was derived. Third, using the 2012 ACS-NSQIP database (validation cohort), the score was validated by calculating its C statistic and evaluating its ability to predict 30-day mortality.From 280,801 NSQIP cases, 18,439 ES cases were analyzed, of which 1,598 (8.7%) resulted in death at 30 days. The multiple logistic regression analyses identified 22 independent predictors of mortality. Based on the relative impact of these predictors, ESAS was derived with a total score range of 0 to 29. ESAS had a C statistic of 0.86; the probability of death at 30 days gradually increased from 0% to 36% then 100% at scores of 0, 11, and 22, respectively. In the validation phase, 19,552 patients were included, the mortality rate was 7.2%, and the ESAS C statistic stayed at 0.86.We have therefore developed and validated a novel score, ESAS, that accurately predicts mortality in ES patients. Such a score could prove useful for (1) preoperative patient counseling, (2) identification of patients needing close postoperative monitoring, and (3) risk adjustment in any efforts at benchmarking the quality of ES.Prognostic/epidemiologic study, level III.

Despite significant advances in burn resuscitation and wound care over the past 30 years, morbidity and mortality from thermal injury remain high. Limited donor skin in severely burned patients hinders effective wound excision and closure, leading to infectious complications and prolonged hospitalizations. Even with large-volume fluid resuscitation, the systemic inflammatory response syndrome compromises end-organ perfusion in burn patients, with resultant multiorgan failure. Stem cells, which enhance wound healing and counteract systemic inflammation, now offer potential therapies for these challenges. Through a review of the literature, this article seeks to illustrate applications of stem cell therapy to burn care and to highlight promising areas of research.

Calorie/protein deficit in the surgical intensive care unit (SICU) is associated with worse clinical outcomes. It is customary to initiate enteral nutrition (EN) at a low rate and increase to goal (RAMP-UP). Increasing evidence suggests that RAMP-UP may contribute to iatrogenic malnutrition. We sought to determine what proportion of total SICU calorie/protein deficit is attributable to RAMP-UP.This is a retrospective study of a prospectively collected registry of adult patients (N = 109) receiving at least 72 hours of EN in the SICU according to the RAMP-UP protocol (July 2012-June 2014). Subjects receiving only trophic feeds or with interrupted EN during RAMP-UP were excluded. Deficits were defined as the amount of prescribed calories/protein minus the actual amount received. RAMP-UP deficit was defined as the deficit between EN initiation and arrival at goal rate. Data included demographics, nutritional prescription/delivery, and outcomes.EN was started at a median of 34.0 hours (interquartile range [IQR], 16.5-53.5) after ICU admission, with a mean duration of 8.7 ± 4.3 days. The median total caloric deficit was 2185 kcal (249-4730), with 900 kcal (551-1562) attributable to RAMP-UP (41%). The protein deficit was 98.5 g (27.5-250.4), with 51.9 g (20.6-83.3) caused by RAMP-UP (53%).In SICU patients initiating EN, the RAMP-UP period accounted for 41% and 53% of the overall caloric and protein deficits, respectively. Starting EN immediately at goal rate may eliminate a significant proportion of macronutrient deficit in the SICU.

Ultrasound (US) is the first-line diagnostic study for evaluating gallstone disease and is considered the test of choice for diagnosing acute cholecystitis (AC). However, computed tomography (CT) is used widely for the evaluation of abdominal pain and is often obtained as a first abdominal imaging test, particularly in cases in which typical clinical signs of AC are absent or other possible diagnoses are being considered. We hypothesized that CT is more sensitive than US for diagnosing AC.A prospective registry of all urgent cholecystectomies performed by our acute care surgery service between June 2008 and January 2014 was searched for cases of AC. The final diagnosis was based on operative findings and pathology. Patients were classified into two groups according to pre-operative radiographic work-up: US only or CT and US. The US group was compared with the CT and US group with respect to clinical and demographic characteristics. For patients undergoing both tests the sensitivity of the two tests was compared.One hundred one patients with AC underwent both US and CT. Computed tomography was more sensitive than US for the diagnosis of AC (92% versus 79%, p=0.015). Ultrasound was more sensitive than CT for identification of cholelithiasis (87% versus 60%, p0.01). Patients undergoing both tests prior to surgery were more likely to be older, male, have medical comorbidities, and lack typical clinical signs of AC.Computed tomography is more sensitive than US for the diagnosis of AC and is most often used in patients without typical clinical signs of AC.

Little is known about intraoperative adverse events (iAEs) in emergency surgery (ES). We sought to describe iAEs in ES and to investigate their clinical and financial impact.The 2007 to 2012 administrative and American College of Surgeons-National Surgical Quality Improvement Program databases at our tertiary academic center were: (1) linked, (2) queried for all ES procedures, and then (3) screened for iAEs using the ICD-9-CM-based Patient Safety Indicator "accidental puncture/laceration". Flagged cases were systematically reviewed to: (1) confirm or exclude the occurrence of iAEs (defined as inadvertent injuries during the operation) and (2) extract additional variables such as procedure type, approach, complexity (measured by relative value units), need for adhesiolysis, and extent of repair. Univariate and multivariate analyses were performed to assess the independent impact of iAEs on 30-day morbidity, mortality, and hospital charges.Of a total of 9,288 patients, 1,284 (13.8%) patients underwent ES, of which 23 had iAEs (1.8%); 18 of 23 (78.3%) of the iAEs involved the small bowel or spleen, 10 of 23 (43.5%) required suture repair, and 8 of 23 (34.8%) required tissue or organ resection. Compared with those without iAEs, patients with iAEs were older (median age 62 vs 50; P = .04); their procedures were more complex (total relative value unit 46.7, interquartile range [27.5 to 52.6] vs 14.5 [.5 to 30.2]; P.001), longer in duration (3 hours: 52% vs 8%; P.001), and more often required adhesiolysis (39.1% vs 13.5% P = .001). Patients with iAEs had increased total charges ($31,080 vs $11,330, P.001), direct charges ($20,030 vs $7,387, P.001), and indirect charges ($11,460 vs $4,088, P.001). On multivariable analyses, iAEs were independently associated with increased 30-day morbidity (odds ratio, 3.56 [CI, 1.10 to 11.54]; P = .03) and prolonged postoperative length of stay (LOS; LOS7 days; odds ratio, 5.60 [1.54 to 20.35]; P = .01]. A trend toward increased mortality did not reach statistical significance.In ES, iAEs are independently associated with significantly higher postoperative morbidity and prolonged LOS.

Cathelicidins are a gene family of antimicrobial peptides produced as inactive precursors. Signal peptidase removes the N-terminal signal sequence, while peptidylglycine alpha-amidating monooxygenase often amidates and cleaves the C-terminal region. Removal of the cathelin domain liberates the active antimicrobial peptide. For mammalian sequences, this cleavage usually occurs through the action of elastase, but other tissue-specific processing enzymes may also operate. Once released, these bioactive peptides are susceptible to proteolytic degradation. We propose that some mature cathelicidins are naturally resistant to proteases due to their unusual primary structures. Among mammalian cathelicidins, proline-rich sequences should resist attack by serine proteases because proline prevents cleavage of the scissile bond. In hagfish cathelicidins, the unusual amino acid bromotryptophan may make the active peptides less susceptible to proteolysis for steric reasons. Such protease resistance could extend the pharmacokinetic lifetimes of cathelicidins in vivo, sustaining antimicrobial activity.

Background Despite the critical importance of cricothyroidotomy (CCT) for patient in extremis, clinical experience with CCT is infrequent, and current training tools are inadequate. The long-term goal is to develop a virtual airway skills trainer that requires a thorough task analysis to determine the critical procedural steps, learning metrics, and parameters for assessment. Methods Hierarchical task analysis is performed to describe major tasks and subtasks for CCT. A rubric for performance scoring for each task was derived, and possible operative errors were identified. Results Time series analyses for 7 CCT videos were performed with 3 different observers. According to Pearson's correlation tests, 3 of the 7 major tasks had a strong correlation between their task times and performance scores. Conclusions The task analysis forms the core of a proposed virtual CCT simulator, and highlights links between performance time and accuracy when teaching individual surgical steps of the procedure.

Background: As strategies in acute care surgery focus on damage control to restore physiology, intensivists spanning all disciplines care for an increasing number of patients requiring massive transfusion, temporary abdominal closures, and their sequelae. Objective: To equip the nonsurgical intensivist with evidence-based management principles for patients with an open abdomen after damage control surgery. Data Source: Search of PubMed database and manual review of bibliographies from selected articles. Data Synthesis and Conclusions: Temporary abdominal closure improves outcomes in patients with abdominal compartment syndrome, hemorrhagic shock, and intra-abdominal sepsis but creates new challenges with electrolyte derangement, hypovolemia, malnutrition, enteric fistulas, and loss of abdominal wall domain. Intensive care of such patients mandates attention to resuscitation, sepsis control, and expedient abdominal closure.

Secondary burn necrosis is the expansion and deepening of the original burn injury several days after injury. Limiting the extent of secondary burn necrosis may improve outcomes. In this study, we examined the ability of the lipid mediator of inflammation-resolution resolvin D2 (RvD2) and chromatin-lysing enzyme (DNase) to reduce secondary burn necrosis. Male Wistar rats were injured using a brass comb with 4 prongs heated in boiling water. This method created 2 parallel rows of 4 rectangular burned areas separated by 3 unburned interspaces. Starting at 2 hours after the burn injury, rats received either 25 ng/kg RvD2 intravenously daily for 7 days or 200 U/kg DNase every 12 hours for 3 days. We documented the necrosis around the initial wounds by digital photography. We used laser Doppler to assess the total blood flux in the burn area. We evaluated the functionality of the capillary network in the interspaces by optical coherence tomography angiography. We performed histological examination of wound skin tissue samples collected at 14 days postburn. We found that the interspace areas were preserved and had higher blood flow in the RvD2-treated group, while the burn areas expanded into the interspace areas, which were confluent by 7 days postburn, in the control-untreated group. We found a larger monocyte-to-neutrophil ratio in the RvD2-treated group compared with the DNase-treated and control groups (P < .05). Overall, RvD2 suppresses secondary necrosis and starts regeneration, highlighting the role of inflammation resolution as a potential therapeutic target in burn care.

Macronutrient deficit in the surgical intensive care unit (ICU) is associated with worse in-hospital outcomes. We hypothesized that increased caloric and protein deficit is also associated with a lower likelihood of discharge to home vs transfer to a rehabilitation or skilled nursing facility.Adult surgical ICU patients receiving72 hours of enteral nutrition (EN) between March 2012 and May 2014 were included. Patients with absolute contraindications to EN,72-hour ICU stay, moribund state, EN prior to surgical ICU admission, or previous ICU admission within the same hospital stay were excluded. Subjects were dichotomized by cumulative caloric (6000 vs ≥ 6000 kcal) and protein deficit (300 vs ≥ 300 g). Baseline characteristics and outcomes were compared using Wilcoxon rank and χ(2) tests. To test the association of macronutrient deficit with discharge destination (home vs other), we performed a logistic regression analysis, controlling for plausible confounders.In total, 213 individuals were included. Nineteen percent in the low-caloric deficit group were discharged home compared with 6% in the high-caloric deficit group (P = .02). Age, body mass index (BMI), Acute Physiology and Chronic Health Evaluation II (APACHE II), and initiation of EN were not significantly different between groups. On logistic regression, adjusting for BMI and APACHE II score, the high-caloric and protein-deficit groups were less likely to be discharged home (odds ratio [OR], 0.28; 95% confidence interval [CI], 0.08-0.96; P = .04 and OR, 0.29; 95% CI, 0.0-0.89, P = .03, respectively).In surgical ICU patients, inadequate macronutrient delivery is associated with lower rates of discharge to home. Improved nutrition delivery may lead to better clinical outcomes after critical illness.

Over the past fifty years, goal-directed resuscitation [1–3], early burn wound excision and grafting [4–7], and recognition of burn hypercatabolism [8–10] have dramatically reduced mortality rates after burn injury [11–15]. Despite this progress, end-organ dysfunction remains a threat throughout a patient’s clinical course. Recent studies approximate the incidence of multiple organ dysfunction as 40–60 % among patients with greater than 20 % total body surface area (TBSA) burns, with associated mortality rates from 22–100 % [16–19]. These mortality rates increase in proportion to the number of failed systems [19]. The link between multi-organ failure and patient mortality highlights the necessity for practitioners to cultivate an understanding of burn pathophysiology, as well as critical care principles of organ support.

Thermal injury triggers a fulminant inflammatory cascade that heralds shock, end-organ failure, and ultimately sepsis and death. Emerging evidence points to a critical role for the innate immune system, and several studies had documented concurrent impairment in neutrophil chemotaxis with these post-burn inflammatory changes. While a few studies suggest that a link between neutrophil motility and patient mortality might exist, so far, cumbersome assays have prohibited exploration of the prognostic and diagnostic significance of chemotaxis after burn injury. To address this need, we developed a microfluidic device that is simple to operate and allows for precise and robust measurements of chemotaxis speed and persistence characteristics at single-cell resolution. Using this assay, we established a reference set of migration speed values for neutrophils from healthy subjects. Comparisons with samples from burn patients revealed impaired directional migration speed starting as early as 24 hours after burn injury, reaching a minimum at 72-120 hours, correlated to the size of the burn injury and potentially serving as an early indicator for concurrent infections. Further characterization of neutrophil chemotaxis using this new assay may have important diagnostic implications not only for burn patients but also for patients afflicted by other diseases that compromise neutrophil functions.