Rolf Lefering

Effect of whole-body CT during trauma resuscitation on survival: a retrospective, multicentre study

BACKGROUND The number of trauma centres using whole-body CT for early assessment of primary trauma is increasing. There is no evidence to suggest that use of whole-body CT has any effect on the outcome of patients with major trauma. We therefore compared the probability of survival in patients with blunt trauma who had whole-body CT during resuscitation with those who had not. METHODS In a retrospective, multicentre study, we used the data recorded in the trauma registry of the German Trauma Society to calculate the probability of survival according to the trauma and injury severity score (TRISS), revised injury severity classification (RISC) score, and standardised mortality ratio (SMR, ratio of recorded to expected mortality) for 4621 patients with blunt trauma given whole-body or non-whole-body CT. FINDINGS 1494 (32%) of 4621 patients were given whole-body CT. Mean age was 42.6 years (SD 20.7), 3364 (73%) were men, and mean injury-severity score was 29.7 (13.0). SMR based on TRISS was 0.745 (95% CI 0.633-0.859) for patients given whole-body CT versus 1.023 (0.909-1.137) for those given non-whole-body CT (p<0.001). SMR based on the RISC score was 0.865 (0.774-0.956) for patients given whole-body CT versus 1.034 (0.959-1.109) for those given non-whole-body CT (p=0.017). The relative reduction in mortality based on TRISS was 25% (14-37) versus 13% (4-23) based on RISC score. Multivariate adjustment for hospital level, year of trauma, and potential centre effects confirmed that whole-body CT is an independent predictor for survival (p </= 0.002). The number needed to scan was 17 based on TRISS and 32 based on RISC calculation. INTERPRETATION Integration of whole-body CT into early trauma care significantly increased the probability of survival in patients with polytrauma. Whole-body CT is recommended as a standard diagnostic method during the early resuscitation phase for patients with polytrauma. FUNDING None.

Steroid controversy in sepsis and septic shock : a meta-analysis

OBJECTIVE The use of corticosteroids in patients with sepsis or septic shock has been controversial for many decades. Clinical studies have reported beneficial, as well as negative results. We conducted a meta-analysis to assess the clinical evidence and to evaluate treatment effects in specific subgroups of patients. DESIGN Meta-analysis. DATA SOURCES A comprehensive search of the literature revealed 49 publications investigating the effect of corticosteroids in patients with sepsis and septic shock. STUDY SELECTION Only ten of the 49 publications were prospective, randomized, controlled trials with an exact description of dosage and regimen. DATA EXTRACTION Treatment effects on mortality were calculated as rate differences in each study (negative values favor steroids), and were combined with respect to the variability in each study. DATA SYNTHESIS Only one study showed a significantly positive effect of steroid treatment. Overall, no positive effect was observed: -0.2% (95% confidence interval: -9.2, 8.8). There were no differences observed when comparing low- vs. high-dose or type of corticosteroid used. Comparing patients with proven Gram-positive or Gram-negative infection showed a slight but not significant difference. The Gram-negative group demonstrated better outcome (-5.6% vs. 1.8%). A quality rating of each trial showed a remarkable increase in quality over time. Adverse events (gastrointestinal bleeding, secondary infections, hyperglycemia) were not more frequent in patients treated with steroids compared with controls. CONCLUSIONS No overall beneficial effect of corticosteroids in patients with septic shock was observed; however, there is some evidence for a positive effect in patients with Gram-negative septicemia.

Psychosocial predictors and correlates for chronic post-surgical pain (CPSP) – A systematic review

Chronic post‐surgical pain (CPSP) is a serious problem. Incidence as high as 50% has been reported, depending on type of surgery undergone. Because the etiology of chronic pain is grounded in the bio‐psychosocial model, physical, psychological, and social factors are implicated in the development of CPSP. Biomedical factors such as pre‐operative pain, severe acute post‐operative pain, modes of anesthesia, and surgical approaches have been extensively examined, therefore this systematic review focuses on psychosocial elements.

Probability of adverse events that have not yet occurred: a statistical reminder.

The probability of adverse and undesirable events during and after operations that have not yet occurred in a finite number of patients (n) can be estimated with Hanleys simple formula, which gives the upper limit of the 95% confidence interval of the probability of such an event: upper limit of 95% confidence interval = maximum risk = 3/n (for n > 30). Doctors and surgeons should keep this simple rule in mind when complication rates of zero are reported in the literature and when they have not (yet) experienced a disastrous complication in a procedure.

Laparoscopic Cholecystectomy for Acute Cholecystitis: Is It Really Safe?

Abstract. The prospectively collected data from 530 cholecystectomies performed in a university clinic from October 1989 to March 1991 were analyzed after 1 to 3 years of follow-up. The aim of this study was to compare the results of laparoscopic cholecystectomy (LC) for acute cholecystitis with that for routine symptomatic gallbladders. The preoperative, intraoperative, and postoperative parameters of 424 routine (noninflamed) LCs and 54 LCs for acutely inflamed gallbladders were compared under the “intention to treat” principle. Operating time was longer in the inflamed group (median 97 minutes versus 75 minutes;p < 0.0001). Significantly more adhesions (20% versus 8%), more blood loss (48% versus 19%), a higher incidence of bile spillage (28% versus 12%), and lost stones (19% versus 8%) were encountered in patients with acute cholecystitis. Common bile duct (CBD) injuries were also more frequent in that group (5.5% versus 0.2%;p = 0.005). The rate of conversion to open surgery was higher than with routine LCs (13% versus 4%). There were two deaths in the routine LC group and none in the acutely inflamed group. There was no difference in postoperative pain intensity or postoperative fatigue according to visual analog scale measurements. Patients with acute cholecystitis stayed only 1 day longer (median 4 days versus 3 days) in hospital. The quality of life scores indicate return to almost normal values by the 14th postoperative day. Long-term follow-up (1–3 years) did not reveal any delayed clinical adverse effects. In summary, LC for inflamed gallbladders has a higher conversion rate than LC for routine symptomatic gallbladders. If successfully performed, it has definite benefit for the patient in terms of better postoperative recovery. The trade-off is that the risk of CBD injury is significantly higher.

The Utstein template for uniform reporting of data following major trauma: A joint revision by SCANTEM, TARN, DGU-TR and RITG

BackgroundIn 1999, an Utstein Template for Uniform Reporting of Data following Major Trauma was published. Few papers have since been published based on that template, reflecting a lack of international consensus on its feasibility and use. The aim of the present revision was to further develop the Utstein Template, particularly with a major reduction in the number of core data variables and the addition of more precise definitions of data variables. In addition, we wanted to define a set of inclusion and exclusion criteria that will facilitate uniform comparison of trauma cases.MethodsOver a ten-month period, selected experts from major European trauma registries and organisations carried out an Utstein consensus process based on a modified nominal group technique.ResultsThe expert panel concluded that a New Injury Severity Score > 15 should be used as a single inclusion criterion, and five exclusion criteria were also selected. Thirty-five precisely defined core data variables were agreed upon, with further division into core data for Predictive models, System Characteristic Descriptors and for Process Mapping.ConclusionThrough a structured consensus process, the Utstein Template for Uniform Reporting of Data following Major Trauma has been revised. This revision will enhance national and international comparisons of trauma systems, and will form the basis for improved prediction models in trauma care.

Development and validation of the revised injury severity classification score for severely injured patients

Introduction:Trauma scores are often used for prognostication and the adjustment of mortality data. The appropriate consideration of identified prognostic factors is mandatory for a valid score with good outcome prediction properties. The Trauma Registry of the German Society for Trauma Surgery (TR-DGU) initially used the Trauma and Injury Severity Score (TRISS) but various reasons led to the development of a new scoring system, the Revised Injury Severity Classification (RISC).Patients and Methods:A total of 2,008 severely injured patients with complete data documented in the TR-DGU during the period 1993–2000 were used to develop a new score. Patients were split into a development sample (n = 1,206) and a validation sample (n = 802). Multivariate logistic regression analysis was applied, and the results were compared with existing score systems. The quality of prediction was determined regarding discrimination (disparity, sensitivity, specificity, receiver operating characteristic [ROC] curve), precision (predicted versus observed mortality), and calibration (Hosmer–Lemeshow goodness-of-fit).Results:Existing score systems (ISS, NISS, RTS, ASCOT, TRISS, Rixen) revealed areas under the ROC curve ranging from 0.767 to 0.877. The RISC combines 11 different components: age, NISS, head injury, severe pelvic injury, Glasgow Coma Scale, partial thromboplastin time (PTT), base excess, cardiac arrest, and indirect signs of bleeding (shock, mass transfusion, and low hemoglobin). The new RISC score reached significantly higher values of above 0.90 for the area under the ROC curve in both development and validation samples. Application to data from 2001 confirmed these results.Conclusion:Outcome prediction including initial laboratory values was able to significantly improve the ability to discriminate between survivors and nonsurvivors. The adjustment of mortality rates should be based on the best available prediction model.

Early versus late onset of multiple organ failure is associated with differing patterns of plasma cytokine biomarker expression and outcome after severe trauma.

Although multiple organ failure (MOF) remains the leading cause of death after trauma, the pathogenic cellular and molecular mechanisms underlying MOF are poorly understood. In addition to proinflammatory and anti-inflammatory mediator cascades, the temporal onset of MOF has generated recent interest because the organ systems involved into MOF seem to deteriorate in a time-dependent fashion after trauma. We therefore investigated the temporal course of MOF in traumatized human patients and evaluated and compared the distribution patterns of cytokine expression, including interleukin (IL) 6, IL-8, IL-10, and the soluble tumor necrosis factor-α receptors sTNF-R p55 and sTNF-R p75 in early-onset versus late-onset MOF. In addition, we analyzed the predictive value of cytokine biomarkers of MOF and lethal outcome. In a prospective observational cohort study conducted at three trauma centers, all patients (n = 352) admitted to two level 1 trauma centers in Germany were enrolled in the study based on the following inclusion criteria: severe traumatic brain injury (TBI) with a Glasgow Coma Scale (GCS) score of 8 or lower and/or distinct changes in cranial computed tomography and/or multiple injuries (MT) to the body (at least two regions had Abbreviated Injury Scale score of 3 or higher). The incidence of MOF was evaluated using the modified Goris-MOF score. The temporal onset of MOF was divided into early-onset MOF (EMOF, developing on days 0-3), late-onset MOF (LMOF, developing on days 4-10), combined early-onset and late-onset MOF (CMOF), and patients never showing signs of MOF during the observation period. In addition, the levels of the serum cytokine markers IL-6, IL-8, IL-10, sTNF-R p55, and sTNF-R p75 were analyzed at specific posttraumatic time points using established enzyme-linked immunosorbent assay techniques. A total of 352 patients (274 men and 78 women; TBI, 101; TBI + MT, 125; MT, 126) were enrolled into the study. Patients assigned to the EMOF group showed specific disruption of pulmonary and cardiocirculatory function, whereas LMOF was significantly associated with hepatic failure. The patients without signs of MOF and the EMOF patients had the same risk of lethal outcome (8.2% vs. 7.5%); LMOF and CMOF were found to be associated with a 3- to 4-fold increase in mortality (38.5% vs. 30.6%, respectively). Analysis of cytokine serum biomarkers revealed that patients with LMOF showed a biphasic elevation of IL-6 and significantly higher sTNF-R concentrations than did all other subgroups (P < 0.001). In addition, the initial values (days 0-1) of sTNF-R p55 and sTNF-R p75 expression levels had a good predictive capacity for the development of LMOF (p55, 0.75; p75, 0.72); values greater than 0.65 were accepted to have a predictive capacity. These results demonstrate that mortality differs significantly between the development of EMOF and LMOF after traumatic injury. Our results also suggest that serum cytokine measurements may be important early biochemical markers for predicting the development of delayed MOF.

Whole-Body CT in Haemodynamically Unstable Severely Injured Patients – A Retrospective, Multicentre Study

Background The current common and dogmatic opinion is that whole-body computed tomography (WBCT) should not be performed in major trauma patients in shock. We aimed to assess whether WBCT during trauma-room treatment has any effect on the mortality of severely injured patients in shock. Methods In a retrospective multicenter cohort study involving 16719 adult blunt major trauma patients we compared the survival of patients who were in moderate, severe or no shock (systolic blood pressure 90–110,<90 or >110 mmHg) at hospital admission and who received WBCT during resuscitation to those who did not. Using data derived from the 2002–2009 version of TraumaRegister®, we determined the observed and predicted mortality and calculated the standardized mortality ratio (SMR) as well as logistic regressions. Findings 9233 (55.2%) of the 16719 patients received WBCT. The mean injury severity score was 28.8±12.1. The overall mortality rate was 17.4% (SMR  = 0.85, 95%CI 0.81–0.89) for patients with WBCT and 21.4% (SMR = 0.98, 95%CI 0.94–1.02) for those without WBCT (p<0.001). 4280 (25.6%) patients were in moderate shock and 1821 (10.9%) in severe shock. The mortality rate for patients in moderate shock with WBCT was 18.1% (SMR 0.85, CI95% 0.78–0.93) compared to 22.6% (SMR 1.03, CI95% 0.94–1.12) to those without WBCT (p<0.001, p = 0.002 for the SMRs). The mortality rate for patients in severe shock with WBCT was 42.1% (SMR 0.99, CI95% 0.92–1.06) compared to 54.9% (SMR 1.10, CI95% 1.02–1.16) to those without WBCT (p<0.001, p = 0.049 for the SMRs). Adjusted logistic regression analyses showed that WBCT is an independent predictor for survival that significantly increases the chance of survival in patients in moderate shock (OR = 0.73; 95%CI 0.60–0.90, p = 0.002) as well as in severe shock (OR = 0.67; 95%CI 0.52–0.88, p = 0.004). The number needed to scan related to survival was 35 for all patients, 26 for those in moderate shock and 20 for those in severe shock. Conclusions WBCT during trauma resuscitation significantly increased the survival in haemodynamically stable as well as in haemodynamically unstable major trauma patients. Thus, the application of WBCT in haemodynamically unstable severely injured patients seems to be safe, feasible and justified if performed quickly within a well-structured environment and by a well-organized trauma team.

Laparoscopic vs conventional appendectomy – a meta-analysis of randomised controlled trials

Aim: To compare the effectiveness and safety of laparoscopic and conventional “open” appendectomy in the treatment of acute appendicitis. Methods: Meta-analysis of randomised controlled trials available by May 1998 that compared both techniques. Within each trial and for each outcome an effect size was calculated; the effect sizes were then pooled by a random-effects model. Results: We summarised outcome data of 2877 patients included in 28 trials. Operating time was +16 min (95% confidence interval +12–20 min) longer for laparoscopic appendectomy. Overall complication rates were comparable, but wound infections were definitely reduced after laparoscopy [rate difference –4.2%, (–2.3% to –6.1%)]. Intra-abdominal abscesses, however, occurred slightly more frequently [+0.9%, (–0.4% to +2.3%)]. Hospital stay after laparoscopic appendectomy was 15 h (8–23 h) shorter, and patients returned to full fitness or work 7 days (5–9 days) earlier. Pain intensity on day 1 was slightly less. Heterogeneity was present for some outcome measures due to methodological differences among the primary studies. Conclusion: Laparoscopic appendectomy reduces wound infections and eases postoperative recovery. Nevertheless, the various differences among the primary studies and their partly flawed methodology make it difficult to generalise from these findings.