D. Dante Yeh

Primary Blast Injuries—An Updated Concise Review

Blast injuries have been increasing in the civilian setting and clinicians need to understand the spectrum of injury and management strategies. Multisystem trauma associated with combined blunt and penetrating injuries is the rule. Explosions in closed spaces increase the likelihood of primary blast injury. Rupture of tympanic membranes is an inaccurate marker for severe primary blast injury. Blast lung injury manifests early and should be managed with lung-protective ventilation. Blast brain injury is more common than previously appreciated.

Adequate Nutrition May Get You Home Effect of Caloric/Protein Deficits on the Discharge Destination of Critically Ill Surgical Patients

BACKGROUND 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. MATERIALS AND METHODS Adult surgical ICU patients receiving >72 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. RESULTS 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). CONCLUSIONS 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.

The Rapid TEG α-Angle may be a sensitive predictor of transfusion in moderately injured blunt trauma patients.

Background. To guide the administration of blood products, coagulation screening of trauma patients should be fast and accurate. The purpose of this study was to identify the correlation between CCT and TEG in trauma, to determine which CCT or TEG parameter is most sensitive in predicting transfusion in trauma, and to define TEG cut-off points for trauma care. Methods. A six-month, prospective observational study of 76 adult patients with suspected multiple injuries was conducted at a Level 1 trauma centre of a university hospital. Physicians blinded to TEG results made the decision to transfuse based on clinical evaluation. Results. The study results showed that conventional coagulation tests correlate moderately with Rapid TEG parameters (R: 0.44–0.61). Kaolin and Rapid TEG were more sensitive than CCTs, and the Rapid TEG α-Angle was identified as the single parameter with the greatest sensitivity (84%) and validity (77%) at a cut-off of 74.7 degrees. When the Rapid TEG α-Angle was combined with heart rate >75 bpm, or haematocrit < 41%, sensitivity (84%, 88%) and specificity (75%, 73%) were improved. Conclusion. Cutoff points for transfusion can be determined with the Rapid TEG α-Angle and can provide better sensitivity than CCTs, but a larger study population is needed to reproduce this finding.

Fulminant Clostridium difficile colitis: prospective development of a risk scoring system.

BACKGROUND Of the patients with a Clostridium difficile infection, 2% to 8% will progress to fulminant C. difficile colitis (fCDC), which carries high morbidity and mortality. No system exists to rapidly identify patients at risk for developing fCDC and possibly in need of surgical intervention. Our aim was to design a simple and accurate risk scoring system (RSS) for daily clinical practice. METHODS We prospectively enrolled all patients diagnosed with a C. difficile infection and compared patients with and without fCDC. An expert panel, combined with data derived from previous studies, identified four risk factors, and a multivariable logistic regression model was performed to determine their effect in predicting fCDC. The RSS was created based on the predictive power of each factor, and calibration, discrimination, and test characteristics were subsequently determined. In addition, the RSS was compared with a previously proposed severity scoring system. RESULTS A total of 746 patients diagnosed with C. difficile infection were enrolled between November 2010 and October 2012. Based on the log (odds ratio) of each risk factor, age greater than 70 years was assigned 2 points, white blood cell count equal to or greater than 20,000/&mgr;L or equal to or less than 2,000/&mgr;L was assigned 1 point, cardiorespiratory failure was assigned 7 points, and diffuse abdominal tenderness on physical examination was assigned 6 points. With the use of this system, the discriminatory value of the RSS (c statistic) was 0.98 (95% confidence interval, 0.96–1).The Hosmer-Lemeshow goodness-of-fit test showed a p value of 0.78, and the Brier score was 0.019. A value of 6 points was determined to be the threshold for reliably dividing low-risk ( <6) from high-risk (≥6) patients. CONCLUSION The RSS is a valid and reliable tool to identify at the bedside patients who are at risk for developing fCDC. External validation is needed before widespread implementation. LEVEL OF EVIDENCE Prognostic study, level II.

Self-expanding foam for prehospital treatment of severe intra-abdominal hemorrhage: dose finding study.

BACKGROUND Noncompressible abdominal bleeding is a significant cause of preventable death on the battlefield and in the civilian trauma environment, with no effective therapies available at point of injury. We previously described the development of a percutaneously administered, self-expanding, poly(urea)urethane foam that improved survival in a lethal Grade V hepatic and portal vein injury model in swine. In this study, we hypothesized that survival with foam treatment is dose dependent. METHODS A high-grade hepatoportal injury was created in a closed abdominal cavity, resulting in massive noncompressible hemorrhage. After injury, the animals were divided into five groups. The control group (n = 12) was treated only with fluid resuscitation, and four polymer groups received different dose volumes (Group 1, n = 6, 64 mL; Group 2, n = 6, 85 mL; Group 3, n = 18, 100 mL; and Group 4, n = 10, 120 mL) in addition to fluids. Ten minutes after injury, the foam was percutaneously administered, and animals were monitored for 3 hours. RESULTS Survival with hepatoportal injury was highest in Group 4 (90%) and decreased in a dose-dependent fashion (Group 3, 72%; Group 2, 33%; Group 1, 17%). All polymer groups survived significantly longer than the controls (8.3%). Hemorrhage rate was reduced in all groups but lowest in Group 4 versus the control group (0.34 [0.052] vs. 3.0 [1.3] mL/kg/min, p < 0.001). Increasing foam dose volume was associated with increased peak intra-abdominal pressure (88.2 [38.9] in Group 4 vs. 9.5 [3.2] in the controls, p < 0.0001) and increased incidence of focal bowel injuries. CONCLUSION The self-expanding foam significantly improves survival in a dose-dependent fashion in an otherwise lethal injury. Higher doses are associated with better survival but resulted in the need for bowel resection.

Sternal fracture—an analysis of the National Trauma Data Bank

BACKGROUND The clinical significance of sternal fractures (SFs) after blunt trauma is heavily debated. We aimed to test the hypothesis that isolated SF is not associated with significant morbidity or mortality. MATERIALS AND METHODS The National Trauma Data Bank (NTDB) sets for 2007-2010 were retrospectively examined. Adult subjects with SF were identified by International Classification of Diseases, Ninth Revision, Clinical Modification diagnostic codes. Data collected included demographics, mechanisms of injury, clinical variables, and in-hospital mortality. The primary outcome measure was in-hospital mortality. Secondary outcome measures included hospital length of stay, intensive care unit days, and ventilator days. RESULTS A total of 32,746 subjects with SF were included. Motor vehicle crash (MVC) was the most common mechanism (84%) in this group and SF was present in 3.7% of all patients admitted after MVC. The mean age was 51 y, 66% were males, and most were white (74%). Overall in-hospital mortality was 8.8% and mortality with isolated SF was 3.5%. Increasing thoracic fracture burden (rib fracture, clavicular fracture, and scapular fracture) was associated with increasing hospital length of stay, intensive care unit days, ventilator days, and mortality. On multivariate regression analysis, other significant predictors of mortality were cardiac arrest, acute respiratory distress syndrome, pulmonary embolism, blunt cardiac injury, pulmonary contusion, increasing age, and lack of insurance. CONCLUSIONS SFs occur in 3.7% of victims after MVC. With isolated SF, the mortality rate is low (3.5%); the tendency for poorer outcomes is most heavily influenced by associated injuries (pulmonary contusions, other thoracic fractures), complications (cardiac arrest, pulmonary embolism, acute respiratory distress syndrome), comorbidities (currently on or requiring dialysis, residual neurologic deficit from stroke), and lack of insurance.

A Survey of Study Habits of General Surgery Residents

OBJECTIVE To understand the study habits of general surgery residents as well as their motivating factors for study. DESIGN A survey was mailed to general surgical residents. Performance on the American Board of Surgery In-Training Examination (ABSITE) was correlated with reported study habits using the Pearsons correlation coefficient. SETTING Massachusetts General Hospital and Brigham and Womens Hospital, 2 urban tertiary referral academic training institutions in Boston, Massachusetts. PARTICIPANTS Fifty-eight general surgical residents of all training levels (including research). RESULTS On average, surgical residents studied for 3 ± 1 days per week, the average duration of each study session being 1.3 ± 0.6 hours. The average total number of study hours per week was 3.4 ± 2.3. There were strong positive correlations between increased study frequency and high overall ABSITE score (Pearsons r = 0.339; p = 0.02) and between the total number of study hours per week and high overall ABSITE score (Pearsons r = 0.423; p < 0.005). Only 10% and 3% reported complete satisfaction with current study materials and routine, respectively. Most residents (96%) reported a willingness to try a new type of study method and 75% were willing to enroll in a trial comparing study methods. CONCLUSIONS Increased study frequency and overall increased study duration are positively correlated with ABSITE performance. Dissatisfaction with current study materials and study routine is high, as is willingness to adopt new methods and enroll in investigational trials comparing study methods.

Patterns of Injury, Outcomes, and Predictors of In-Hospital and 1-Year Mortality in Nonagenarian and Centenarian Trauma Patients

IMPORTANCE With the dramatic growth in the very old population and their concomitant heightened exposure to traumatic injury, the trauma burden among this patient population is estimated to be exponentially increasing. OBJECTIVE To determine the clinical outcomes and predictors of in-hospital and 1-year mortality in nonagenarian and centenarian trauma patients (NCTPs). DESIGN, SETTING, AND PARTICIPANTS All patients 90 years or older admitted to a level 1 academic trauma center between January 1, 2006, and December 31, 2010, with a primary diagnosis of trauma were included. Standard trauma registry data variables were supplemented by systematic medical record review. Cumulative mortality rates at 1, 3, 6, and 12 months after discharge were investigated using the Social Security Death Index. Univariate and multivariable analyses were performed to identify the predictors of in-hospital and 1-year postdischarge cumulative mortalities. MAIN OUTCOMES AND MEASURES Length of hospital stay, in-hospital mortality, and cumulative mortalities at 1, 3, 6, and 12 months after discharge. RESULTS Four hundred seventy-four NCTPs were included; 71.7% were female, and a fall was the predominant mechanism of injury (96.4%). The mean patient age was 93 years, the mean Injury Severity Score was 12, and the mean number of comorbidities per patient was 4.4. The in-hospital mortality was 9.5% but cumulatively escalated at 1, 3, 6, and 12 months after discharge to 18.5%, 26.4%, 31.3%, and 40.5%, respectively. Independent predictors of in-hospital mortality were the Injury Severity Score (odds ratio [OR], 1.09; 95% CI, 1.02-1.16; P = .01), mechanical ventilation (OR, 6.23; 95% CI, 1.42-27.27; P = .02), and cervical spine injury (OR, 4.37; 95% CI, 1.41-13.50; P = .01). Independent predictors of cumulative 1-year mortality were head injury (OR, 2.65; 95% CI, 1.24-5.67; P = .03) and length of hospital stay (OR, 1.06; 95% CI, 1.02-1.11; P = .005). Cumulative 1-year mortality in NCTPs with a head injury was 51.1% and increased to 73.2% if the Injury Severity Score was 25 or higher and to 78.7% if mechanical ventilation was required. Most NCTPs required rehabilitation; only 8.9% were discharged to home. CONCLUSIONS AND RELEVANCE Despite low in-hospital mortality, the cumulative mortality rate among NCTPs at 1 year after discharge is significant, particularly in the presence of head injury, spine injury, mechanical ventilation, high injury severity, or prolonged length of hospital stay. These considerations can help guide clinical decisions and family discussions.

Opening Pandora's box: understanding the nature, patterns, and 30-day outcomes of intraoperative adverse events.

BACKGROUND Little evidence exists regarding the characteristics of intraoperative adverse events (iAEs). METHODS Administrative data, the American College of Surgeons - National Surgical Quality Improvement Project, and systematic review of operative reports were used to confirm iAEs in abdominal surgery patients. Standard American College of Surgeons - National Surgical Quality Improvement Project data were supplemented with variables including injury type/organ, phase of operation, adhesions, repair type, and intraoperative consultations. RESULTS Two hundred twenty-seven iAEs (187 patients) were confirmed in 9,292 patients. Most common injuries were enterotomies during intestinal surgery (68%) and vessel injuries during hepatopancreaticobiliary surgery (61%); 108 iAEs (48%) specifically occurred during adhesiolysis. A third of the iAEs required organ/tissue resection or complex reconstruction. Because of iAEs, 20 intraoperative consults (11%) were requested and 9 of the 66 (16%) laparoscopic cases were converted to open. Thirty-day mortality and morbidity were 6% and 58%, respectively. The complications included perioperative transfusions (36%), surgical site infection (19%), systemic sepsis (13%), and failure to wean off the ventilator (12%). CONCLUSIONS iAEs commonly occur in reoperative cases requiring lysis of adhesions and possibly lead to increased patient morbidity. Understanding iAEs is essential to prevent their occurrence and mitigate their adverse effects.

Evaluation of a vancomycin dosing nomogram based on the Modification of Diet in Renal Disease equation in intensive care unit patients

PURPOSE The purpose of the study is to evaluate the effectiveness of a vancomycin nomogram using actual body weight and the Modification of Diet in Renal Disease equation to estimate renal function in intensive care unit patients. METHODS Retrospective evaluation (preimplementation group, n=57) was conducted from March 2011 to April 2011. Prospective evaluation was conducted after nomogram implementation (postimplementation group, n=60) from December 2011 to February 2012. RESULTS The percentage of patients with an initial vancomycin trough concentration 15 μg/mL or higher increased in the postimplementation group as compared with the preimplementation group (72% vs 39%, P=.0004). The postimplementation group also demonstrated an increase in the percentage of patients with initial trough concentration between 15 and 20 μg/mL (42% vs 19%, P=.0099), and no statistical difference in the percentage of patients with an initial trough greater than 20 μg/mL (30% vs 19%, P=.2041). There was no difference in nephrotoxicity in the postimplementation group compared with the preimplementation group (18% vs 17.5%, P=1.0). CONCLUSION Use of a vancomycin nomogram increased the percentage of initial vancomycin trough concentrations 15 μg/mL or higher in intensive care unit patients and was not associated with an increased occurrence of nephrotoxicity.