Imaging of Altered Mental Status

Yield of Neurodiagnostic Testing in Children Presenting to a Pediatric Emergency Department With Altered Mental Status

BACKGROUND

Emergency department (ED) visits for altered mental status (AMS) in children are common. Neuroimaging is often performed to ascertain etiology, but its utility has not been well studied. Our objective is to describe the yield of neuroimaging studies in children who present to an ED with AMS.

METHODS

We performed a retrospective chart review of children 0-18 years of age, presenting to our PED between 2018 and 2021 with AMS. We abstracted patient demographics, physical examination, neuroimaging and EEG results, and final diagnosis. Neuroimaging and EEG studies were classified as normal or abnormal. Abnormal studies were categorized as clinically important and contributory: abnormalities that were clinically important and contributed to the etiology, clinically important but noncontributory: abnormalities that were clinically significant but did not explain the etiology, and incidental: abnormalities that were not clinically significant.

RESULTS

We analyzed 371 patients. The most common etiology of AMS was toxicologic (188, 51%) with neurologic causes (n = 50, 13.5%) accounting for a minority. Neuroimaging was performed in one-half (169, 45.5%) and abnormalities were noted in 44 (26%) studies. Abnormalities were clinically important and contributed to the etiologic diagnosis of AMS in 15/169 (8.9%), clinically important and noncontributory in 18/169 (10.7%), and incidental in 11/169 (6.5%). EEG was performed in 65 patients (17.5%), of which 17 (26%) were abnormal with only one being clinically important and contributory.

CONCLUSIONS

Though neuroimaging was performed in approximately one half of the cohort, it was contributory in a minority. Similarly, diagnostic utility of EEG in children with AMS was low.

Duret Brainstem Hemorrhage After Transtentorial Descending Brain Herniation: A Systematic Review and Meta-Analysis

BACKGROUND

Historically, the occurrence of hemorrhage in the brainstem after an episode of supratentorial intracranial hypertension was described by Henri Duret in 1878. Nevertheless, to date the eponym Duret brainstem hemorrhage (DBH) lacks systematic evidence regarding its epidemiology, pathophysiology, clinical and radiologic presentation, and outcome.

METHODS

We conducted a systematic literature review and meta-analysis using the Medline database from inception to 2022 looking for English-language articles concerning DBH, in accordance with the PRISMA guidelines.

RESULTS

The research yielded 28 articles for 32 patients (mean age, 50 years; male/female ratio, 3:1). Of patients, 41% had head trauma causing 63% of subdural hematoma, responsible for coma in 78% and mydriasis in 69%. DBH appeared on the emergency imaging in 41% and on delayed imaging in 56%. DBH was located in the midbrain in 41% of the patients, and in the upper middle pons in 56%. DBH was caused by sudden downward displacement of the upper brainstem secondary to supratentorial intracranial hypertension (91%), intracranial hypotension (6%), or mechanical traction (3%). Such downward displacement caused the rupture of basilar artery perforators. Brainstem focal symptoms (P = 0.003) and decompressive craniectomy (P = 0.164) were potential favorable prognostic factors, whereas an age >50 years showed a trend toward a poor prognosis (P = 0.0731).

CONCLUSIONS

Unlike its historical description, DBH appears as a focal hematoma in the upper brainstem caused by the rupture of anteromedial basilar artery perforators after sudden downward displacement of the brainstem, regardless of its cause.

Analysis of emergency head computed tomography in critically ill oncological patients

BACKGROUND

Critically ill cancer patients have an increased risk of developing acute neurological signs. The study objective was to evaluate the use and the usefulness of emergency head computed tomography (EHCT) in this category of patients.

PATIENTS AND METHODS

This retrospective, single-centre, cohort study included patients with EHCT performed during Intensive Care Unit (ICU) admission for a period of three years. Indications, imagistic findings, type of malignancy, and outcome were evaluated to identify diagnostic yield and correlations between abnormal findings on positive scans, malignancy type, and mortality rate.

RESULTS

Sixty-four EHCTs were performed in 54 critically ill cancer patients, with 32 scans (50%) showing previously unknown lesions and considered to be positive. The most frequent abnormal findings were ischemic (15 EHCTs, 47%) and haemorrhagic (13 EHCTs, 40%) lesions. Thirty-eight EHCTs (59%) were indicated for altered mental status, with a positivity rate of 50%. Eighteen EHCTs (48%) were performed in hematological malignancy patients: 9 (50%) of which were positive with 8/9 (89%) displaying hemorrhagic lesions. Twenty EHCTs were performed in solid tumour patients, 10 (50%) of which were positive, with 9/10 (90%) displaying ischemic lesions. Out of 54 patients, 30 (55%) died during ICU stay. The mortality rate was higher in patients with hematological malignancies and positive EHCT (78% vs. 58%).

CONCLUSIONS

Diagnostic yield of EHCT in critically ill cancer patients is much higher than in other categories of ICU patients. We support the systematic use of EHCT in critically ill, mainly hemato-oncological patients with nonspecific neurological dysfunction, as it may lead to early identification of intracranial complications.