Admission Injury Severity Score Research Articles

SP7.1 - Risk Profile of Administration of 3- and 4-factor Prothrombin Complex Concentrate in Adult Anticoagulated Trauma Patients: A Systematic Review and Meta-Analysis

Abstract Aims To establish thromboembolic complication (TC, primary outcome) and mortality (secondary outcome) Odds Ratios (ORs) following 3-factor Prothrombin Complex Concentrate (PCC3, Comparator Group [CG] 1) and 4-factor Prothrombin Complex Concentrate (PCC4, CG2) administration, compared to Fresh Frozen Plasma (FFP) alone, in adult Vitamin K antagonist-anticoagulated trauma patients. Methods Systematic database and grey literature searches were performed. Random effects model meta-analyses were undertaken for each of this study’s outcomes, producing ORs and 95% Confidence Intervals (95%CIs). The I2 statistic was used to quantify interstudy heterogeneity. Inverse Variance, Mann-Whitney U and Kruskal-Wallis tests were used to examine interstudy demographic/treatment differences. Risk of bias was assessed with the Newcastle-Ottawa Scale, study quality with the GRADE tool. Results 8 papers met inclusion criteria (CG1 n=3, CG2 n=3), 2 were excluded due to insufficient reported information. TC incidence was not significantly increased following PCC3 administration (ORcombined effect1.57, 95% CI 0.24-10.51, p=0.64). Meta-analysis was not performed on TC incidence in CG2 owing to only 1 paper reporting this outcome. Mortality risk was not significantly increased following PCC3 (ORcombined effect1.61, 95%CI 0.27-9.51, p=0.60) or PCC4 (ORcombined effect2.19, 95%CI 0.96-4.98, p=0.06) administration. Admission Injury Severity Score (ISS) and age varied significantly between papers included in CG1 (mean­ISS=15.5, 95%CI=12.0-20.1, p<0.05, meanage=75.3years, 95%CI=65.5-86.7, p<0.05) and CG2 (meanISS=15.1, 95%CI=13.4-17.0, p<0.05, meanage=79.2years, 95%CI=74.7-84.1, p<0.05). Conclusion TC risk is not overtly increased following PCC3 administration, compared to FFP. The same is true for mortality risk following PCC3 and PCC4 administration. There is substantial room for bias in the results reported, further research is warranted.

The Variation of Withdrawal of Life Sustaining Therapy in Older Adults With Traumatic Brain Injury

IntroductionThe decision to withdraw life sustaining treatment (WDLST) in older adults with traumatic brain injury is subject to wide variability leading to nonbeneficial interventions and unnecessary use of hospital resources. We hypothesized that patient and hospital factors are associated with WDLST and WDLST timing. MethodsAll traumatic brain injury patients ≥65 with Glasgow coma scores (GCS) of 4-11 from 2018 to 2019 at level I and II centers were selected from the National Trauma Data Bank. Patients with head abbreviated injury scores 5-6 or death within 24 h were excluded. Bayesian additive regression tree analysis was performed to identify the cumulative incidence function (CIF) and the relative risks (RR) over time for withdrawal of care, discharge to hospice (DH), and death. Death alone (no WDLST or DH) served as the comparator group for all analyses. A subanalysis of the composite outcome WDLST/DH (defined as end-of-life-care), with death (no WDLST or DH) as a comparator cohort was performed. ResultsWe included 2126 patients, of whom 1957 (57%) underwent WDLST, 402 (19%) died, and 469 (22%) were DH. 60% of patients were male, and the mean age was 80 y. The majority of patients were injured by fall (76%, n = 1644). Patients who were DH were more often female (51% DH versus 39% WDLST), had a past medical history of dementia (45% DH versus 18% WDLST), and had lower admission injury severity score (14 DH versus 18.6 WDLST) (P < 0.001). Compared to those who DH, those who underwent WDLST had a lower GCS (9.8 versus 8.4, P < 0.001). CIF of WDSLT and DH increased with age, stabilizing by day 3. At day 3, patients ≥90 y had an increased RR of DH compared to WDLST (RR 2.5 versus 1.4). As GCS increased, CIF and RR of WDLST decreased, while CIF and RR of DH increased (RR on day 3 for GCS 12: WDLST 0.42 versus DH 1.31).Patients at nonprofit institutions were more likely to undergo WDLST (RR 1.15) compared to DH (0.68). Compared to patients of White race, patients of Black race had a lower RR of WDLST at all timepoints. ConclusionsPatient and hospital factors influence the practice of end-of-life-care (WDLST, DH, and death), highlighting the need to better understand variability to target palliative care interventions and standardize care across populations and trauma centers.

Early Mortality Risk in Acute Trauma Patients: Predictive Value of Injury Severity Score, Trauma Index, and Different Types of Shock Indices.

Objective: This study aimed to explore the predictive value of the Injury Severity Score (ISS), Trauma Index (TI) and different types of shock indices (SI) on the early mortality risk of acute trauma patients. Methods: Clinical data of acute trauma patients who met the inclusion and exclusion criteria of this study and were treated in the hospital from January 2020 to December 2020 were retrospectively collected, including gender, age, trauma mechanism, severe injury site, ISS, TI, admission vital signs, different types of shock indices (SI), death within 7 days, length of hospital stay, and Glasgow Outcome Score (GOS). The predictive value of the Injury Severity Score, Trauma Index, and different types of shock indices on the risk of early mortality in patients with acute trauma were compared using relevant statistical methods. Results: A total of 283 acute trauma patients (mean age 54.0 ± 17.9 years, 30.74% female) were included, and 43 (15.19%) of the patients died during 7 days of hospitalization. The admission ISS, TI, SI, MSI, and ASI in the survival group were significantly lower than those in the death group, and the difference was statistically significant (p < 0.05). Meanwhile, different trauma assessment tools included in the study have certain predictive value for early mortality risk of trauma patients. Conclusions: The TI indicates a better capability to predict the risk of early death in patients with acute trauma. As the most sensitive predictor, the SI has the greatest reference value in predicting the risk of early death in patients with traumatic shock.

Comparative Therapeutic Effectiveness of Anticoagulation and Conservative Management in Traumatic Cerebral Venous Sinus Thrombosis.

Consensus is currently lacking in the optimal treatment for blunt traumatic cerebral venous sinus thrombosis (tCVST). Anticoagulation (AC) is used for treating spontaneous CVST, but its role in tCVST remains unclear. To investigate the characteristics and outcomes of patients treated with AC compared with patients managed conservatively. We retrospectively reviewed patients who presented to a Level 1 trauma center with acute skull fracture after blunt head trauma who underwent dedicated venous imaging. There were 137 of 424 patients (32.3%) presenting with skull fractures with tCVST on venous imaging. Among them, 82 (60%) were treated with AC while 55 (40%) were managed conservatively. Analysis of baseline characteristics demonstrated no significant difference in age, sex, admission Glasgow Coma Scale, admission Injury Severity Score, rates of associated intracranial hemorrhage, or neurosurgical interventions. New or worsening intracranial hemorrhage was seen in 7 patients treated with AC. Patients on AC had significantly lower mortality than non-AC (1% vs 15%; P = .003). There was no difference in the Glasgow Coma Scale or Glasgow Outcome Scale at last clinical follow-up. On follow-up venous imaging, patients treated with AC were more likely to experience full thrombus recanalization than non-AC (54% vs 32%; P = .012), and subsequent multiple regression analysis revealed that treatment with AC was a significant predictor of full thrombus recanalization (odds ratio, 5.18; CI, 1.60-16.81; P = .006). Treatment with AC for tCVST due to blunt head trauma may promote higher rates of complete thrombus recanalization when compared with conservative management.

A multi-registry analysis of military and civilian penetrating cervical carotid artery injury.

Penetrating cervical carotid artery injury is an uncommon but high-stake scenario associated with stroke and death. The objective of this study was to characterize and compare penetrating carotid injury in the military and civilian setting, as well as provide considerations for management. Cohorts with penetrating cervical carotid artery injury from the Department of Defense Trauma Registry (2002-2015) and the American Association for the Surgery of Trauma Prospective Observation Vascular Injury Treatment Registry (2012-2018) were analyzed. A least absolute shrinkage and selection operator multivariate analysis using random forest-based imputation was performed to identify risk factors affecting stroke and mortality. There were a total of 157 patients included in the study, of which 56 (35.7%) were military and 101 (64.3%) were civilian. The military cohort was more likely to have been managed with open surgery (87.5% vs. 44.6%, p < 0.001) and to have had any procedure to restore or maintain flow to the brain (71.4% vs. 35.6%, p < 0.001), while the civilian cohort was more likely to undergo nonoperative management (45.5% vs. 12.5%, p < 0.001). Stroke rate was higher within the military cohort (41.1% vs. 13.9%, p < 0.001); however, mortality did not differ between the groups (12.5% vs. 17.8%, p = 0.52). On multivariate analysis, predictors for stroke were presence of a battle injury (log odds, 2.1; p < 0.001) and internal or common carotid artery ligation (log odds 1.5, p = 0.009). For mortality outcome, protective factors included a high Glasgow Coma Scale on admission (log odds, -0.21 per point; p < 0.001). Increased admission Injury Severity Score was a predictor of mortality (log odds, 0.05 per point; p = 0.005). The stroke rate was higher in the military cohort, possibly reflecting complexity of injury; however, there was no difference in mortality between military and civilian patients. For significant injuries, concerted efforts should be made at carotid reconstruction to reduce the occurrence of stroke. Retrospective cohort analysis, level III.

Mortality and Functional Outcome Predictors in Combat-Related Penetrating Brain Injury Treatment in a Specialty Civilian Medical Facility.

The combined use of new types of weapons and new types of personal protective equipment has led to changes in the occurrence, nature, and severity of penetrating brain wounds. The availability of modern equipment, methods of treatment, and trained medical personnel in a civilian hospital, as well as advanced specialty medical care, has improved treatment outcomes. There have been a limited number of publications regarding analysis and predictors of treatment outcomes in patients with combat-related penetrating brain injury in contemporary armed conflicts. The purpose of this study was to analyze the results of surgical treatment of patients with penetrating brain injury and to identify significant outcome predictors in these patients. This was a prospective analysis of penetrating brain injury in patients who were admitted to Mechnikov Dnipropetrovsk Regional Clinical Hospital, Ukraine, from May 9, 2014, to December 31, 2017. All wounds were sustained during local armed conflict in Eastern Ukraine. The primary outcomes of interest were mortality rate at 1month and Glasgow Outcome Scale score at 12months after the injury. In total, 184 patients were identified with combat-related brain injury; of those, 121 patients with penetrating brain injury were included in our study. All patients were male soldiers with a mean age of 34.1years (standard deviation [SD], 9.1 years). Mean admission Glasgow Coma Scale score was 10 (SD, 4), and mean admission Injury Severity Score was 27.7 (SD, 7.6). Mortality within 1month was 20.7%, and intracranial purulent-septic complications were diagnosed in 11.6% of the patients. Overall, 65.3% of the patients had favorable outcome (good recovery or moderate disability) based on Glasgow Outcome Scale score at 12months after the injury. The following were predictors of mortality or poor functional outcome at 1year after the injury: low Glasgow Coma Scale score on admission, gunshot wound to the head, dural venous sinuses wound, presence of intracerebral hematomas, intraventricular and subarachnoid hemorrhage accompanied by lateral or axial dislocation, and presence of intracranial purulent-septic complications. Generally, combat-related penetrating brain injuries had satisfactory treatment outcomes. Treatment outcomes in this study were comparable to those previously reported by other authors in military populations and significantly better than outcomes of peacetime penetrating brain injury treatment.

Two-year mortality and functional outcomes in combat-related penetrating brain injury: battlefield through rehabilitation.

OBJECTIVEThere are limited data concerning the long-term functional outcomes of patients with penetrating brain injury. Reports from civilian cohorts are small because of the high reported mortality rates (as high as 90%). Data from military populations suggest a better prognosis for penetrating brain injury, but previous reports are hampered by analyses that exclude the point of injury. The purpose of this study was to provide a description of the long-term functional outcomes of those who sustain a combat-related penetrating brain injury (from the initial point of injury to 24 months afterward).METHODSThis study is a retrospective review of cases of penetrating brain injury in patients who presented to the Role 3 Multinational Medical Unit at Kandahar Airfield, Afghanistan, from January 2010 to March 2013. The primary outcome of interest was Glasgow Outcome Scale (GOS) score at 6, 12, and 24 months from date of injury.RESULTSA total of 908 cases required neurosurgical consultation during the study period, and 80 of these cases involved US service members with penetrating brain injury. The mean admission Glasgow Coma Scale (GCS) score was 8.5 (SD 5.56), and the mean admission Injury Severity Score (ISS) was 26.6 (SD 10.2). The GOS score for the cohort trended toward improvement at each time point (3.6 at 6 months, 3.96 at 24 months, p > 0.05). In subgroup analysis, admission GCS score ≤ 5, gunshot wound as the injury mechanism, admission ISS ≥ 26, and brain herniation on admission CT head were all associated with worse GOS scores at all time points. Excluding those who died, functional improvement occurred regardless of admission GCS score (p < 0.05). The overall mortality rate for the cohort was 21%.CONCLUSIONSGood functional outcomes were achieved in this population of severe penetrating brain injury in those who survived their initial resuscitation. The mortality rate was lower than observed in civilian cohorts.

A Randomized Controlled Trial on Intra-Abdominal Irrigation during Emergency Trauma Laparotomy; Time for Yet Another Paradigm Shift.

To determine the optimal volume of abdominal irrigation that will prevent surgical site infections (both deep and superficial), eviscerations and fistula formations; and improve 30-day mortality in trauma patients. We conducted a three-arm parallel clinical superiority randomized controlled trial comparing different volumes of effluent (5, 10 and 20 liters) used in trauma patients (both blunt and penetrating) age 14 and above undergoing an emergency laparotomy between April 2002 and July 2004 in a busy urban Level 1 trauma center. After randomization, a total of 204 patients were analyzed. All patient groups were comparable with respect to age, gender distribution, admission injury severity score, and mechanism of injury, estimated blood loss and degree of contamination. The mortality rate overall was 1.96% (4/204).No differences were noted with respect to contamination, wound infection, fistula formation, and evisceration. The twenty liter group (Group III) showed a trend toward an increased incidence of deep surgical site infections when compared to the five liter (Group I) (p=0.051) and ten liter (Group II) (p=0.057) groups. This did not however reach statistical significance. The old surgical adage "the solution to pollution is dilution" is not applicable to trauma patients. Our results suggest that using more irrigation, even when large amounts of contamination have occurred, does not reduce post-operative complications or affect mortality; and it may predispose patients to increased incidence of abscess formation. (Trial registration number: ISRCTN66454589).

Suction evacuation of hemothorax: A prospective study.

Although tube thoracostomy is a common procedure after thoracic trauma, incomplete evacuation of fluid places the patient at risk for retained hemothorax. As little as 300 to 500 cm of blood may result in the need for an additional thoracostomy tube or, in more severe cases, lung entrapment and empyema. We hypothesized that suction evacuation of the thoracic cavity before tube placement would decrease the incidence of late complications. Patients requiring tube thoracostomy within 96 hours of admission were prospectively identified and underwent suction evacuation of the pleural space (SEPS) before tube placement. These patients were compared to historical controls without suction evacuation. Demographics, admission vital signs, laboratory values, details of chest tube placement, and outcomes were collected on all patients. Multivariable logistic regression was used to compare outcomes between groups. A total of 199 patients were identified, consisting of 100 retrospective controls and 99 SEPS patients. There were no differences in age, sex, admission injury severity score or chest abbreviated injury score, admission laboratory values or vital signs, or hospital length of stay. Mean (SD) volume of hemothorax in SEPS patients was 220 (297) cm; with only 48% having a volume greater than 100 cm at the time of tube placement. Three patients developed empyema, and 19 demonstrated retained blood; there was no difference between SEPS and control patients. Suction evacuation of the pleural space was significantly protective against recurrent pneumothorax after chest tube removal (odds ratio, 0.332; 95% confidence interval, 0.148-0.745). Preemptive suction evacuation of the thoracic cavity did not have a significant impact on subsequent development of retained hemothorax or empyema. Suction evacuation of the pleural space significantly decreased incidence of recurrent pneumothorax after thoracostomy removal. Although the mechanism is unclear, such a benefit may make this simple procedure worthwhile. A larger sample size is required for validation and to determine if preemptive thoracic evacuation has a clinical benefit. Therapeutic/care management study, level IV.

Anemia and Blood Transfusion in Patients with Isolated Traumatic Brain Injury.

Rationale. By reducing cerebral oxygen delivery, anemia may aggravate traumatic brain injury (TBI) secondary insult. This study evaluated the impact of anemia and blood transfusion on TBI outcomes. Methods. This was a retrospective cohort study of adult patients with isolated TBI at a tertiary-care intensive care unit from 1/1/2000 to 31/12/2011. Daily hemoglobin level and packed red blood cell (PRBC) transfusion were recorded. Patients with hemoglobin < 10 g/dL during ICU stay (anemic group) were compared with other patients. Results. Anemia was present on admission in two (2%) patients and developed in 48% during the first week with hemoglobin < 7 g/dL occurring in 3.0%. Anemic patients had higher admission Injury Severity Score and underwent more craniotomy (50% versus 13%, p < 0.001). Forty percent of them received PRBC transfusion (2.8 ± 1.5 units per patient, median pretransfusion hemoglobin = 8.8 g/dL). Higher hospital mortality was associated with anemia (25% versus 6% for nonanemic patients, p = 0.01) and PRBC transfusion (38% versus 9% for nontransfused patients, p = 0.003). On multivariate analysis, only PRBC transfusion independently predicted hospital mortality (odds ratio: 6.8; 95% confidence interval: 1.1–42.3). Conclusions. Anemia occurred frequently after isolated TBI, but only PRBC transfusion independently predicted mortality.

Percutaneous versus Open Tracheostomy: Comparison of Procedures and Surgical Site Infections

Tracheostomy is one of the most common procedures performed in trauma patients in the intensive care unit (ICU). Few studies have evaluated the incidence of surgical site infections (SSIs) specifically in a trauma population. Our objective was to compare the incidence of SSI after open versus percutaneous tracheostomy and to discern whether there were any differences in outcome. A prospective single-institution study was conducted on 640 patients admitted to the ICU over eight years who underwent tracheostomy. Age, gender, race, admission Injury Severity Score (ISS) and Acute Physiology and Chronic Health Evaluation (APACHE) II score, and mechanism of injury were obtained. The majority of patients were male (56.1%) and white (62.5%) with a mean age of 43.2 ± 20.2 years, ISS of 30.7 ± 13.2 points, and APACHE score of 13.3 ± 6.3 points. The majority of patients were admitted for blunt trauma (85.1%). The outcome was measured by hospital (HLOS) and ICU (ILOS) lengths of stay, duration of mechanical ventilation, infection rate, and mortality rate. A total of 330 open and 310 percutaneous tracheostomies were performed. A total of 36 SSIs (5.3%) were found. Patients who underwent percutaneous tracheostomy had a statistically significantly lower rate of SSI (3.4%) than the open surgery group (7%) (p=0.04). There was no difference in HLOS, ILOS, ventilator days, or mortality rate. To our knowledge, this is the largest study of the benefit of percutaneous tracheostomy in a critically injured trauma population. The risk of SSI is significantly lower after percutaneous than open tracheostomy.

Heterotopic ossification after knee dislocation: the predictive value of the injury severity score.

To determine the relationship of multiple variables, including the Injury Severity Score (ISS), closed head injury (CHI), and timing and type of surgery to formation of motion-limiting heterotopic ossification (HO) following knee dislocation. Longitudinal observational study. University level 1 trauma center. Thirty-five consecutive patients with 36 knee dislocations (OTA fracture and dislocation classification 40-D) admitted over a 26-month period. Admission ISS, Glasgow Coma scale (GCS) scores, CHI, timing (> or < 3 weeks from injury) and type (open or arthroscopic) of surgery, number of cruciate ligaments reconstructed, medial surgical procedure, and eventual presence or absence of motion-limiting HO. A classification system for HO was developed ranging from none (type 0) to ankylosing (type IV) HO. Twenty-nine patients with type 0-III HO recovered an average range of motion of 126 degrees at an average of 14 months (group A). Six patients formed ankylosing type IV HO (group B). The ISS in group A ranged from 9 to 26. ISS in group B ranged from 26 to 50 (P < 0.001). Regarding the formation of type IV HO, the sensitivity of an ISS >/=26 was 100%, the specificity was 97%, and the positive predictive value was 86%. Patients in group B had a greater incidence of documented CHI (P < 0.025). Timing and type of surgery, number of ligaments reconstructed, and whether or not the patient had a medial surgical procedure had no statistical influence on degree of HO formation. An ISS of 26 seems to be a discrete boundary above which patients with knee dislocation are at extremely high risk for type IV HO formation if undergoing surgical reconstruction and below which patients are likely spared this complication. The presence of a CHI is a significant factor in type IV HO formation, although harder to quantify. None of the remaining independent variables studied were significantly related to ankylosing type IV HO formation.

Pedestrian pelvic fractures: 5-year experience of a major urban trauma center.

Pedestrian injury accounts for approximately 14% of all vehicular-associated mortality. We performed a retrospective review of 1,014 injured pedestrians admitted to our statewide trauma center between January 1, 1990, and December 31, 1994, to determine the pattern and severity of pelvic injury in injured pedestrians, the types of associated injuries relative to those pelvic injury patterns, and the relationship between pelvic fracture treatment modalities and patient outcome. Approximately 11% (111 of 1,014) of the patients had high-energy pelvic ring disruptions. The average age of these 57 men and 54 women was 39.4 years. The average admission Injury Severity Score and Glasgow Coma Scale values were 29.2 and 11.7, respectively. Pelvic injuries were classified according to the mechanism of injury: lateral compression, anteroposterior compression, vertical shear, and combined mechanical injury fractures. We compared the mean Glasgow Coma Scale scores, blood utilization, number of associated injuries, and mortality rate for each classification. Associated trauma included neurologic (30 of 111, 27.0%), thoracic (29 of 111, 26.1%), and abdominal injury (16 of 111, 14.4%). Overall blood product utilization averaged 1,971 mL within the first 24 hours and overall mortality was 26 of 111 (23.4%). There were 79 (71.2%) lateral compression, 23 (20.7%) anteroposterior compression, six (5.4%) vertical shear, and three (2.7%) combined mechanical injury fractures. As the severity of lateral compression and anteroposterior compression pelvic fractures increased, Glasgow Coma Scale scores decreased and Injury Severity Score values, blood utilization, number of associated injuries, and mortality rate increased. The highest mortality rate (50%) was associated with the most severe (grade III) lateral compression and anteroposterior compression injuries. Of particular interest, was the difference in the 24-hour blood utilization and mortality rates for patients with lateral compression type II pelvic fractures treated before (nonoperative management) and after (early external fixation) 1993: 4,760 versus 1,375 mL of blood and 36.4 versus 12.5% mortality rate, respectively. In conclusion, pelvic fracture appears to be a substantial factor in pedestrian morbidity and mortality. Although most pedestrian morbidity and mortality is not caused by the intrinsic nature of the pelvic fracture, the severity of these injuries is correlated with the degree of destructive energy imparted to the body as a whole, as manifested by the number and severity of associated injuries and the mortality rate.