[Thoracic and abdominal trauma in children]

Emergency whole-body CT scans in pediatric patients with trauma: patterns of injuries, yield of dual-phase scanning, and influence of second read on detection of injuries

OBJECTIVES

To describe injury patterns in children with multiple trauma (MT), evaluate the yield of dual-phase whole-body CT (WBCT), and quantify missed injuries detected on second reading.

METHODS

Remotely analyzed WBCT performed between 2011 and 2020 in 63 emergency departments on children admitted for MT were included. Second reading occurred within 24 h. Collected data included age, sex, mechanism, Injury Severity Score (ISS), radiologists' experience, time and duration of first reading, conclusion of both readings, and dosimetry. Melvin score assessed the clinical impact of missed injuries.

RESULTS

Overall, 1114 patients were included, 1982 injuries were described in 662 patients (59.4%), 452/1114 (40.6%) WBCT were negative, and 314 (28.2%) patients had MT (≥ 2 body parts injured). The most frequent injuries were pulmonary contusions (8.3%), costal fractures (6.2%), and Magerl A1 vertebral fractures (4.9%). Overall, 151 injuries were missed in 92 (8.3%) patients. Independent predictors for missed injuries were age ≤ 4 years (p = 0.03), number of injured body parts ≥ 2 (p = 0.01), and number of injuries ≥ 3 (p < 0.001). Melvin score grade 3 lesions were found in 16/92 (17.4%) patients with missed injuries (1.4% of all WBCT), where only prolonged follow-up was necessary. Thirteen active bleeding or pseudoaneurysms were detected (0.7% of injuries).

CONCLUSION

Injuries were diagnosed in 59.4% of patients. Double-reading depicted additional injuries in 8.3% of patients, significantly more in children ≤ 4 years, with ≥ 3 injuries or ≥ 2 injured body parts. As 28 % of patients had MT and 1.1% had active extravasation or pseudoaneurysm, indication for WBCT should be carefully weighted.

KEY POINTS

• When performed as a first-line imaging evaluation, approximately 41% of WBCT for MT children were considered normal. • The three most common injuries were pulmonary contusions, costal fractures, and Magerl A1 vertebral fractures, but the patterns of traumatic injuries on WBCT depended on the children's age and the trauma mechanism. • The independent predictors of missed injuries were age ≤ 4 years, number of body parts involved ≥ 2, and total number of injuries ≥ 3.

The Predictors for Positive Yield Abdominal Computed Tomography in Pediatric Abdominal Trauma

OBJECTIVES

Abdominal computed tomography (ACT) use in the initial evaluation of pediatric abdominal trauma is liberal in most instances. The aim of this study was to identify the predictors for a positive yield ACT scan in this population.

METHODS

A prospective, cohort, single-center observational study was conducted at Children's Hospital at Westmead, New South Wales, from January 2008 to June 2015 on 240 pediatric abdominal trauma patients who had abdominal computed tomography. Clinical, laboratory, imaging, and interventional variables were explored with univariate and multivariate analyses among children who sustained abdominal trauma.

RESULTS

Of 240 patients, positive ACT scans were found in 161 patients (67%), 112 patients (47%) had intra-abdominal injury, and 20 patients (8%) required invasive therapeutic interventions. Mortality rate was 1.7% (4 patients) due to nonabdominal causes. Multivariate analyses revealed that increasing age (odds ratio [OR], 1.12; 95% confidence interval [CI], 1.02-1.24; P = 0.024), high injury severity score (OR, 1.14; 95% CI, 1.07-1.21; P < 0.001), abnormal abdominal examination (OR, 5.95; 95% CI, 2.08-17.01; P = 0.001), elevated alanine aminotransferase greater than 125 IU/L (OR, 46.28; 95% CI, 2.81-762.49; P = 0.007), abnormal pelvic radiograph (OR, 14.03; 95% CI, 2.39-82.28; P = 0.003), presence of gross hematuria (OR, 4.14; 95% CI, 1.04-18.23; P = 0.044), low initial hematocrit level (less than 30%) (OR, 8.51; 95% CI, 1.14-63.70; P = 0.037), and positive focused assessment with sonography for trauma (OR, 2.61; 95% CI, 1.01-7.28; P = 0.048) remained significantly associated with abnormal ACT scan. In contrast, those who required scanning of other body region(s) were less likely to have abnormal ACT scan (OR, 0.34; 95% CI, 0.14-0.86; P =0.022).

CONCLUSIONS

Integrating the abdominal examination findings, relevant laboratory values, and focused assessment with sonography for trauma results with the physicians' suspicion may aid in stratifying patients for ACT scan. Further efforts should be made to decrease number of normal ACT scans; yet not to increase the number of delayed or missed injures with its inherent morbidity and mortality.

Acute Chest Diseases: Infection and Trauma

Acute chest diseases include clinical situations with infectious and traumatic etiology. Pulmonary infection is the most common indication for performing chest radiography. Radiological imaging often confirms the diagnosis and allows the evaluation of the location and extent of infection. Chest radiography is the primary imaging procedure and the starting point for the evaluation of all children with acute chest disease. Accurate interpretation of pediatric chest films also requires a basic understanding of the physiologic and anatomic differences among adults, neonates, and infants and their most important differences will be referred. Characterization of pulmonary infiltrates is important, because patterns of abnormality suggest specific organisms and aetiologies. Although providing evidence suggestive of the causative agent, the chest radiograph cannot confirm viral infection, confirm or exclude bacterial etiology. In fact, in infancy, pneumonia usually produces a combination of alterations of the airspace and interstitium. However, some aspects may be useful in distinguishing between viral and bacterial pneumonia. Close attention to CT technique is crucial for imaging evaluation of pneumonia in pediatric patients, namely those with persistent symptoms and/or progressive symptoms despite medical or surgical therapy, or in immunocompromised patients. CT with low radiation dose technique should be carefully performed in these cases. CT examination with IV contrast is very useful for the evaluation of complications of chest infection. Thoracic trauma in children is rare, only 4–6 % of children are hospitalized following severe trauma. Only a small number of children with trauma have thoracic injury (14 %), but the injuries tend to be of serious nature. About 25–50 % of thoracic trauma cases occur in combination with other trauma locations. Pulmonary contusion and lacerations, tracheobronchial injuries, pneumothorax, and esophageal rupture are referred as the main consequences of trauma. The decision for the appropriate use of imaging techniques must consider the specific case under review. Chest radiography should be the initial screening method. The decision to use CT is determined by the nature of the trauma, the clinical circumstances, and the prediction of future revaluation, always taking into account the radiation dose applied to the child.

Evaluation for intra-abdominal injury in children after blunt torso trauma: can we reduce unnecessary abdominal computed tomography by utilizing a clinical prediction model?

BACKGROUND

Blunt trauma is a leading cause of morbidity and mortality in children. Despite the potential for malignancy, increased cost, limited small bowel injury detection sensitivity, and the low incidence of injury requiring operative intervention, the use of computed tomographic (CT) scan in pediatric blunt trauma evaluation remains common. Previous studies suggest that a clinical model using examination and laboratory data may help predict intra-abdominal injuries (IAIs) and potentially limit unnecessary CT scans in children.

METHODS

A retrospective chart review of all blunt "trauma alerts" for patients younger than 16 years during an 18-month period was performed at a Level I trauma center. Clinical factors, which might predict blunt IAI (hemodynamics, abdominal examination, serology, and plain radiographs), and potential limitations to performing a reliable abdominal examination (altered mental status, young age) were reviewed. A previously defined clinical prediction model based on six high-risk clinical variables for blunt IAI (hypotension, abnormal abdominal examination, elevated aspartate aminotransferase, elevated amylase, low hematocrit, and heme-positive urinalysis) was applied to each patient.

RESULTS

Of the 125 "trauma alert" patients who sustained blunt trauma during the study period, 97 underwent abdominal CT scan, with only 15 identified as IAI. Our prediction rule would have identified 16 of 17 patients with IAI (SE, 94%) as high-risk and missed only 1 patient (grade I spleen laceration, which did not require operation) (negative predictive value, 99%). Of the 83 patients with no risk factors for IAI based on the prediction rule, 54 underwent a negative abdominal CT scan. Of these 54 patients, only 22 had a potential limitation to a reliable abdominal examination. Application of our prediction rule could have prevented unnecessary CT scan in at least 32 patients (33%) during an 18-month period.

CONCLUSION

Use of a prediction model based on high-risk variables for IAI may decrease cost and radiation exposure by reducing the number of abdominal CT scans in children being evaluated for blunt abdominal trauma.