P008: Evaluation of outcomes after implementation of a provincial prehospital bypass standard for trauma patients – an Eastern Ontario experience

Introduction: Trauma and injury play a significant role in the population's burden of disease. Limited research exists evaluating the role of trauma bypass protocols. The objective of this study was to assess the impact and effectiveness of a newly introduced prehospital field trauma triage (FTT) standard, allowing paramedics to bypass a closer hospital and directly transport to a trauma centre (TC) provided transport times were within 30 minutes. Methods: We conducted a 12-month multi-centred health record review of paramedic call reports and emergency department health records following the implementation of the 4 step FTT standard (step 1: vital signs and level of consciousness, step 2: anatomical injury, step 3: mechanism and step 4: special considerations) in nine paramedic services across Eastern Ontario. We included adult trauma patients transported as an urgent transport to hospital, that met one of the 4 steps of the FTT standard and would allow for a bypass consideration. We developed and piloted a standardized data collection tool and obtained consensus on all data definitions. The primary outcome was the rate of appropriate triage to a TC, defined as any of the following: injury severity score ≥12, admitted to an intensive care unit, underwent non-orthopedic operation, or death. We report descriptive and univariate analysis where appropriate. Results: 570 adult patients were included with the following characteristics: mean age 48.8, male 68.9%, attended by Advanced Care Paramedic 71.8%, mechanisms of injury: MVC 20.2%, falls 29.6%, stab wounds 10.5%, median initial GCS 14, mean initial BP 132, prehospital fluid administered 26.8%, prehospital intubation 3.5%, transported to a TC 74.6%. Of those transported to a TC, 308 (72.5%) had bypassed a closer hospital prior to TC arrival. Of those that bypassed a closer hospital, 136 (44.2%) were determined to be “appropriate triage to TC”. Bypassed patients more often met the step 1 or step 2 of the standard (186, 66.9%) compared to the step 3 or step 4 (122, 39.6%). An appropriate triage to TC occurred in 104 (55.9%) patients who had met step 1 or 2 and 32 (26.2%) patients meeting step 3 or 4 of the FTT standard. Conclusion: The FTT standard can identify patients who should be bypassed and transported to a TC. However, this is at a cost of potentially burdening the system with poor sensitivity. More work is needed to develop a FTT standard that will assist paramedics in appropriately identifying patients who require a trauma centre.

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P136: What happens to bypassed trauma patients meeting Field Trauma Triage standards?

CJEM ◽

10.1017/cem.2020.340 ◽

2020 ◽

Vol 22 (S1) ◽

pp. S113-S113

Author(s):

M. Austin ◽

J. Sinclair ◽

S. Leduc ◽

S. Duncan ◽

J. Rouleau ◽

...

Keyword(s):

Orthopedic Surgery ◽

Motor Vehicle ◽

Vital Signs ◽

Trauma Patients ◽

Level Of Consciousness ◽

Control And Prevention ◽

Ct Head ◽

Trauma Triage ◽

Record Review ◽

The Impact

Introduction: Prehospital field trauma triage (FTT) standards were reviewed and revised in 2014 based on the recommendations of the Centers for Disease Control and Prevention. The FTT standard allows a hospital bypass and direct transport, within 30 min, to a lead trauma hospital (LTH). Our objectives were to assess the impact of the newly introduced prehospital FTT standard and to describe the emergency department (ED) management and outcomes of patients that had bypassed closer hospitals. Methods: We conducted a 12-month multi-centred health record review of paramedic and ED records following the implementation of the 4 step FTT standard (step 1: vital signs and level of consciousness (physiologic), step 2: anatomical injury, step 3: mechanism and step 4: special considerations) in nine paramedic services across Eastern Ontario. We included adult trauma patients transported as urgent that met FTT standard, regardless of transport time. We developed and piloted a data collection tool and obtained consensus on all definitions. The primary outcome was the rate of appropriate triage to a LTH which was defined as: ISS ≥12, admitted to intensive care unit (ICU), non-orthopedic surgery, or death. We have reported descriptive statistics. Results: 570 patients were included: mean age 48.8, male 68.9%, falls 29.6%, motor vehicle collisions 20.2%, stab wounds 10.5%, transported to a LTH 76.5% (n = 436). 72.2% (n = 315) of patients transported to a LTH had bypassed a closer hospital and 126/306 (41.2%) of those were determined to be an appropriate triage to LTH (9 patients had missing outcomes). ED management included: CT head/cervical spine 69.9%, ultrasound 53.6%, xray 51.6%, intubation 15.0%, sedation 11.1%, tranexamic acid 9.8%, blood transfusion 8.2%, fracture reduction 6.9%, tube thoracostomy 5.9%. Outcomes included: ISS ≥ 12 32.7%, admitted to ICU 15.0%, non-orthopedic surgery 11.1%, death 8.8%. Others included: admission to hospital 57.5%, mean LOS 12.8 days, orthopedic surgery 16.3% and discharged from ED 37.3%. Conclusion: Despite a high number of admissions, the majority of trauma patients bypassed to a LTH were considered over-triaged, with a low number of ED procedures and non-orthopedic surgeries. Continued work is needed to appropriately identify patients requiring transport to a LTH.

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Utility of venous blood gases for the assessment of traumatic shock: a prospective observational study

Emergency Medicine Journal ◽

10.1136/emermed-2020-209751 ◽

2021 ◽

pp. emermed-2020-209751

Author(s):

Andrew R Coggins ◽

Nurojan Vivekanandamoorthy ◽

Karen Byth ◽

Tabish Aleemullah ◽

Selwyn T Selvendran ◽

...

Keyword(s):

Injury Severity ◽

A Priori ◽

Venous Blood ◽

False Negative ◽

Blood Gases ◽

Traumatic Shock ◽

Trauma Centre ◽

Trauma Patients ◽

Blood Gas ◽

The Impact

BackgroundABG samples are often obtained in trauma patients to assess shock severity. Venous blood gas (VBG) sampling, which is less invasive, has been widely used to assess other forms of shock. The study aim was to determine the agreement between VBG and ABG measurements in trauma.MethodsPatients were enrolled at an Australian trauma centre between October 2016 and October 2018. Bland-Altman limits of agreement (LOA) between paired blood gas samples taken <30 min apart were used to quantify the extent of agreement. The impact of using only VBG measurements was considered using an a priori plan. Cases where venous sampling failed to detect ‘concerning levels’ were flagged using evidence-based cut-offs: pH ≤7.2, base deficit (BD) ≤−6, bicarbonate <21 and lactate ≥4. Case summaries of these patients were assessed by independent trauma clinicians as to whether an ABG would change expected management.ResultsDuring the study period 176 major trauma patients had valid paired blood gas samples available for analysis. The median time difference between paired measurements was 11 min (IQR 6–17). There was a predominance of men (81.8%) and blunt trauma (92.0%). Median Injury Severity Score was 13 (range 1–75) and inpatient mortality was 6.3%. Mean difference (ABG−VBG) and LOA between paired arterial and venous measurements were 0.036 (LOA −0.048 to 0.120) for pH, −1.27 mmol/L (LOA −4.35 to 1.81) for BD, −0.64 mmol/L (LOA −1.86 to 0.57) for lactate and −1.97 mmol/L (LOA −5.49 to 1.55) for bicarbonate. Independent assessment of the VBG ‘false negative’ cases (n=20) suggested an ABG would change circulatory management in two cases.ConclusionsIn trauma patients VBG and ABG parameters displayed suboptimal agreement. However, in cases flagged as VBG ‘false negative’ independent review indicated that the availability of an ABG was unlikely to change management.

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Is computerized tomography of trauma patients associated with a transfer delay to a regional trauma centre?

CJEM ◽

10.1017/s1481803500010113 ◽

2008 ◽

Vol 10 (03) ◽

pp. 205-208 ◽

Cited By ~ 10

Author(s):

Justin Onzuka ◽

Andrew Worster ◽

Bill McCreadie

Keyword(s):

Length Of Stay ◽

Injury Severity ◽

Significant Proportion ◽

Ct Scanning ◽

Trauma Centre ◽

Trauma Patients ◽

Transfer Delay ◽

Significant Difference ◽

Primary Hospital ◽

Record Review

ABSTRACT Objective: Many trauma patients undergo advanced diagnostic imaging before being transferred to a regional trauma centre, but this step can delay definitive care. This study compared the length-of-stay at the primary hospital between patients who underwent CT scans and those who did not. Methods: This was a medical record review of all consecutive trauma cases transferred to a regional trauma centre servicing 2.2 million people during a 2-year period. Two trained abstractors, blind to each other's results, collected data independently. Results: Of 249 cases, 79 (31%) underwent a CT scan before being transferred. There was no significant difference in the Injury Severity Score between the 2 groups (p = 0.16), yet the CT group remained at the primary hospital approximately 90 minutes longer before transfer (p < 0.001). Conclusion: A significant proportion of trauma patients transferred to a regional trauma centre undergo CT scanning at the primary hospital. These patients experience an increased length-of-stay of 90 minutes, on average, before transfer. This appears to be a common practice that does not appear to contribute to definitive trauma management.

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Validation of the BATT score for prehospital risk stratification of traumatic haemorrhagic death: usefulness for tranexamic acid treatment criteria

Scandinavian Journal of Trauma Resuscitation and Emergency Medicine ◽

10.1186/s13049-020-00827-5 ◽

2021 ◽

Vol 29 (1) ◽

Author(s):

Francois-Xavier Ageron ◽

Timothy J. Coats ◽

Vincent Darioli ◽

Ian Roberts

Keyword(s):

Tranexamic Acid ◽

Acid Treatment ◽

Injury Severity ◽

External Validation ◽

Research Network ◽

Brier Score ◽

Trauma Patients ◽

Using Data ◽

The Uk ◽

The Impact

Abstract Background Tranexamic acid reduces surgical blood loss and reduces deaths from bleeding in trauma patients. Tranexamic acid must be given urgently, preferably by paramedics at the scene of the injury or in the ambulance. We developed a simple score (Bleeding Audit Triage Trauma score) to predict death from bleeding. Methods We conducted an external validation of the BATT score using data from the UK Trauma Audit Research Network (TARN) from 1st January 2017 to 31st December 2018. We evaluated the impact of tranexamic acid treatment thresholds in trauma patients. Results We included 104,862 trauma patients with an injury severity score of 9 or above. Tranexamic acid was administered to 9915 (9%) patients. Of these 5185 (52%) received prehospital tranexamic acid. The BATT score had good accuracy (Brier score = 6%) and good discrimination (C-statistic 0.90; 95% CI 0.89–0.91). Calibration in the large showed no substantial difference between predicted and observed death due to bleeding (1.15% versus 1.16%, P = 0.81). Pre-hospital tranexamic acid treatment of trauma patients with a BATT score of 2 or more would avoid 210 bleeding deaths by treating 61,598 patients instead of avoiding 55 deaths by treating 9915 as currently. Conclusion The BATT score identifies trauma patient at risk of significant haemorrhage. A score of 2 or more would be an appropriate threshold for pre-hospital tranexamic acid treatment.

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Assessing the need for resuscitative endovascular balloon occlusion of the aorta (REBOA) for management of non-compressible hemorrhage at a Canadian urban trauma centre

10.21203/rs.3.rs-198760/v1 ◽

2021 ◽

Author(s):

Elizabeth Purssell ◽

Sean Patrick ◽

Joseph Haegert ◽

Vesna Ivkov ◽

John Taylor

Keyword(s):

Injury Severity ◽

Retrospective Chart Review ◽

Balloon Occlusion ◽

Trauma Centre ◽

Trauma Patients ◽

Potential Candidate ◽

Study Objective ◽

Resuscitative Thoracotomy ◽

Less Invasive ◽

Endovascular Balloon Occlusion

Abstract Introduction Resuscitative endovascular balloon occlusion of the aorta (REBOA) is a less invasive alternative to resuscitative thoracotomy (RT) for life threatening, infra-diaphragmatic, non-compressible hemorrhage from trauma. Existing evidence surrounding the efficacy of REBOA is conflicting; nevertheless, expert consensus suggests that REBOA should be considered in select trauma patients. There has been a paucity of studies that evaluate the potential utility of REBOA in the Canadian setting. The study objective was to evaluate the percentage of trauma patients presenting to a Level 1 Canadian trauma centre that would have met criteria for REBOA. Methods We conducted a retrospective chart review of patients recorded in the British Columbia Trauma Registry who warranted a trauma team activation (TTA) at our institution. We identified REBOA candidates using pre-defined criteria based on published guidelines. Each TTA case was screened by a reviewer, and then each Potential Candidate was reviewed by a panel of trauma physicians for determination of final candidacy. Results Fourteen patients were classified as Likely REBOA Candidates (2.2% of TTAs, median age 46.1 years, 64.3% female). These patients had a median Injury Severity Score of 31.5 (IQR 26.8). The main sources of hemorrhage in these patients were from abdominal injuries (71.4%) and pelvic fractures (42.9%). Conclusion The percentage of patients who met criteria for REBOA is similar to that of RTs performed at our Canadian institution. While REBOA would be performed infrequently, it is a less-invasive alternative to RT, which could be a potentially life-saving procedure in a small group of the most severely injured trauma patients.

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An Objective Study of the Impact of the Electronic Medical Record on Outcomes in Trauma Patients

The American Surgeon ◽

10.1177/000313481207801134 ◽

2012 ◽

Vol 78 (11) ◽

pp. 1249-1254 ◽

Cited By ~ 4

Author(s):

Paul J. Schenarts ◽

Claudia E. Goettler ◽

Michael A. White ◽

Brett H. Waibel

Keyword(s):

Length Of Stay ◽

Medical Record ◽

Electronic Medical Record ◽

Injury Severity ◽

Unit Length ◽

Traumatic Injury ◽

Hospital Length Of Stay ◽

Trauma Patients ◽

Delay In Diagnosis ◽

The Impact

It is commonly believed that the electronic medical record (EMR) will improve patient outcomes. However, there is scant published literature to support this claim and no studies in any surgical population. Our hypothesis was that the EMR would not improve objective outcome measures in patients with traumatic injury. Prospectively collected data from our university-based Level I trauma center was retrospectively reviewed. Demographic, injury severity as well as outcomes and complications data were compared for all patients admitted over a 20-month period before introduction of the EMR and a 20-month period after full, hospital-wide use of the EMR. Implementation of the EMR was associated with a decreased hospital length of stay, P = 0.02; intensive care unit length of stay, P = 0.001; ventilator days, P = 0.002; acute respiratory distress syndrome, P = 0.006, pneumonia, P = 0.008; myocardial infarction, P = 0.001; line infection, P = 0.03; septicemia, P = 0.000; renal failure, P = 0.000; drug complication, P = 0.001; and delay in diagnosis, P = 0.04. There was no difference in mortality, unexpected cardiac arrest, missed injury, pulmonary embolism/deep vein thrombosis, or late urinary tract infection. This is the first study to investigate the impact of the EMR in surgical patients. Although there was an improvement in some complications, the overall impact was inconsistent.

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Venous Thromboembolism in Trauma Patients

The American Surgeon ◽

10.1177/000313480707301121 ◽

2007 ◽

Vol 73 (11) ◽

pp. 1173-1180 ◽

Cited By ~ 13

Author(s):

Om P. Sharma ◽

Michael F. Oswanski ◽

Rusin J. Joseph ◽

Peter Tonui ◽

Libby Westrick Pa-C ◽

...

Keyword(s):

Risk Factor ◽

Venous Thromboembolism ◽

Injury Severity Score ◽

Severity Score ◽

Injury Severity ◽

Univariate Analysis ◽

Trauma Patients ◽

Vein Thrombosis ◽

Cord Injury ◽

Deep Vein

Serial venous duplex scans (VDS) were done in 507 trauma patients with at least one risk factor (RF) for venous thromboembolism (VTE) during a 2-year study period. Deep vein thrombosis (DVT) was detected in 31 (6.1%) patients. This incidence was 3.1 per cent in low (1–2 RFs), 3.4 per cent in moderate (3–5 RFs), and 7.7 per cent in high (≥6 RFs) VTE scores ( P = 0.172). Incidence was statistically different (3% vs 7.2%, P = 0.048) on reanalyzing patients in two risk categories, low-risk (1–4 RFs) and high-risk (≥5 RFs). Only 4 of 16 RFs had statistically higher incidence of DVT in patients with or without RFs: previous VTE (27.3% vs 5.6%, odds ratio (OR) 6.628, P = 0.024), spinal cord injury (22.6% vs 5%, OR 5.493, P = 0.001), pelvic fractures (11.4% vs 5.1%, OR 2.373, P = 0.042), and head injury with a greater than two Abbreviated Injury Score (10.5% vs 4.2%, OR 2.639, P = 0.014). On reanalyzing patients with ≥5 RFs vs <5RFs, obesity (14.3 vs 6.1%, P = 0.007), malignancy (5.6% vs 0.6%, P = 0.006), coagulopathy (10.8% vs 1.8%, P = 0.000), and previous VTE (3.2% vs 0%, P = 0.019) were significant on univariate analysis. Patients with DVT had 3.70 ± 1.75 RFs and a 9.61 ± 4.93 VTE score, whereas, patients without DVT had 2.66 ± 1.50 RFs and a 6.83 ± 3.91 VTE score ( P = 0.000). DVTs had a direct positive relationship with higher VTE scores, length of stay, and number of VDS (>1 r, P ≤ 0.001). Increasing age was a weak risk factor (0.03 r, P = 0.5). First two VDS diagnosed 77 per cent of DVTs. Patients with injury severity score of ≥15 and 25 had higher DVTs compared with the ones with lower injury severity score levels ( P ≤ 0.05). Pulmonary embolism was silent in 63 per cent and DVTs were asymptomatic in 68 per cent.

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Early versus Late Tracheostomy: Is There an Outcome Difference?

The American Surgeon ◽

10.1177/000313481908500427 ◽

2019 ◽

Vol 85 (4) ◽

pp. 370-375 ◽

Cited By ~ 7

Author(s):

Adel Elkbuli ◽

Raed Ismail Narvel ◽

Paul J. Spano ◽

Valerie Polcz ◽

Astrid Casin ◽

...

Keyword(s):

Traumatic Brain Injury ◽

Brain Injury ◽

Glasgow Coma Scale ◽

Primary Outcome ◽

Injury Severity ◽

Future Research ◽

Trauma Patients ◽

Early Tracheostomy ◽

Outcome Difference ◽

The Impact

The effect of timing in patients requiring tracheostomy varies in the literature. The purpose of this study was to evaluate the impact of early tracheostomy on outcomes in trauma patients with and without traumatic brain injury (TBI). This study is a four-year review of trauma patients undergoing tracheostomy. Patients were divided into two groups based on TBI/non-TBI. Each group was divided into three subgroups based on tracheostomy timing: zero to three days, four to seven days, and greater than seven days postadmission. TBI patients were stratified by the Glasgow Coma Scale (GCS), and non-TBI patients were stratified by the Injury Severity Score (ISS). The primary outcome was ventilator-free days (VFDs). Significance was defined as P < 0.05. Two hundred eighty-nine trauma patients met the study criteria: 151 had TBI (55.2%) versus 138 (47.8%) non-TBI. There were no significant differences in demographics within and between groups. In TBI patients, statistically significant increases in VFDs were observed with GCS 13 to 15 for tracheostomies performed in four to seven versus greater than seven days ( P = 0.005). For GCS <8 and 8 to 12, there were significant increases in VFDs for tracheostomies performed at days 1 to 3 and 4 to 7 versus greater than seven days (P << 0.05 for both). For non-TBI tracheostomies, only ISS ≥ 25 with tracheostomies performed at zero to three days versus greater than seven days was associated with improved VFDs. Early tracheostomies in TBI patients were associated with improved VFDs. In trauma patients with no TBI, early tracheostomy was associated with improved VFDs only in patients with ISS ≥ 25. Future research studies should investigate reasons TBI and non-TBI patients may differ.

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Predictors of Mortality in Trauma Patients Aged 80 years or Older

The American Surgeon ◽

10.1177/000313481608201014 ◽

2016 ◽

Vol 82 (10) ◽

pp. 926-929 ◽

Cited By ~ 2

Author(s):

Kyle Mock ◽

Jessica Keeley ◽

Ashkan Moazzez ◽

David S. Plurad ◽

Brant Putnam ◽

...

Keyword(s):

Mechanical Ventilation ◽

Injury Severity ◽

Univariate Analysis ◽

The United States ◽

Geriatric Trauma ◽

Trauma Patients ◽

Inhospital Mortality ◽

Predictors Of Mortality ◽

Trauma Outcome ◽

Level 1 Trauma Center

The population of the United States is predicted to age dramatically over the next few decades; as such older patients will comprise an increasing proportion of the injured populations. Due to multiple comorbidities and frailty, the old and very old are at greater risk for mortality than younger patients. To identify predictors of inhospital mortality in these patients, we performed a retrospective cohort study at our Level 1 trauma center. Between April 2009 and October 2014, we identified 193 trauma patients aged 80 years and older admitted to the intensive care unit. The mean age was 86 years old (4.9) and a majority of patients were white (57%) and male (54%). Univariate analysis found Injury Severity Score ( P < 0.01), initial Glasgow Coma Scale ( P < 0.01), admission pH ( P = <0.01), admission lactate ( P < 0.01), the need for mechanical ventilation ( P < 0.01), and Geriatric Trauma Outcome Score ( P < 0.01) to be predictors of mortality. Multivariate analysis identified length of mechanical ventilation [odds ratio (OR) = 0.73, 95% confidence interval (CI) = 0.60–0.90, P < 0.01], admission lactate (OR = 1.74, 95% CI = 1.21–2.51, P < 0.01), and the need for mechanical ventilation (OR = 18.2, 95% CI = 3.33–99.8, P < 0.01) as independent predictors of mortality. These predictors can help guide clinical decisions and should prompt early discussion of goals of care. The association between mechanical ventilation and mortality is confounded by withdrawal of care.

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Higher Mortality Rate in Moderate-to-Severe Thoracoabdominal Injury Patients with Admission Hyperglycemia Than Nondiabetic Normoglycemic Patients

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph16193562 ◽

2019 ◽

Vol 16 (19) ◽

pp. 3562

Author(s):

Wei-Ti Su ◽

Shao-Chun Wu ◽

Sheng-En Chou ◽

Chun-Ying Huang ◽

Shiun-Yuan Hsu ◽

...

Keyword(s):

Mortality Rate ◽

Injury Severity ◽

Burn Injury ◽

Past History ◽

Trauma Patients ◽

Thoracoabdominal Injuries ◽

History Of ◽

Level 1 ◽

The Impact ◽

Level 1 Trauma Center

Background: Hyperglycemia at admission is associated with an increase in worse outcomes in trauma patients. However, admission hyperglycemia is not only due to diabetic hyperglycemia (DH), but also stress-induced hyperglycemia (SIH). This study was designed to evaluate the mortality rates between adult moderate-to-severe thoracoabdominal injury patients with admission hyperglycemia as DH or SIH and in patients with nondiabetic normoglycemia (NDN) at a level 1 trauma center. Methods: Patients with a glucose level ≥200 mg/dL upon arrival at the hospital emergency department were diagnosed with admission hyperglycemia. Diabetes mellitus (DM) was diagnosed when patients had an admission glycohemoglobin A1c ≥6.5% or had a past history of DM. Admission hyperglycemia related to DH and SIH was diagnosed in patients with and without DM. Patients who had a thoracoabdominal Abbreviated Injury Scale score <3, a polytrauma, a burn injury and were below 20 years of age were excluded. A total of 52 patients with SIH, 79 patients with DH, and 621 patients with NDN were included from the registered trauma database between 1 January 2009, and 31 December 2018. To reduce the confounding effects of sex, age, comorbidities, and injury severity of patients in assessing the mortality rate, different 1:1 propensity score-matched patient populations were established to assess the impact of admission hyperglycemia (SIH or DH) vs. NDN, as well as SIH vs. DH, on the outcomes. Results: DH was significantly more frequent in older patients (61.4 ± 13.7 vs. 49.8 ± 17.2 years, p < 0.001) and in patients with higher incidences of preexisting hypertension (2.5% vs. 0.3%, p < 0.001) and congestive heart failure (3.8% vs. 1.9%, p = 0.014) than NDN. On the contrary, SIH had a higher injury severity score (median [Q1–Q3], 20 [15–22] vs. 13 [10–18], p < 0.001) than DH. In matched patient populations, patients with either SIH or DH had a significantly higher mortality rate than NDN patients (10.6% vs. 0.0%, p = 0.022, and 5.3% vs. 0.0%, p = 0.043, respectively). However, the mortality rate was insignificantly different between SIH and DH (11.4% vs. 8.6%, odds ratio, 1.4; 95% confidence interval, 0.29–6.66; p = 0.690). Conclusion: This study revealed that admission hyperglycemia in the patients with thoracoabdominal injuries had a higher mortality rate than NDN patients with or without adjusting the differences in patient’s age, sex, comorbidities, and injury severity.

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