Diagnostic Value of Ultrasound in Detecting Causes of Pediatric Chest X-Ray Opacity

Point-of-care lung ultrasound in detecting pneumonia: A systematic review

Purpose

Limited evidence exists to assess the sensitivity, specificity, and accuracy of point-of-care lung ultrasound (LUS) across all age groups. This review aimed to investigate the benefits of point-of-care LUS for the early diagnosis of pneumonia compared to traditional chest X-rays (CXR) in a subgroup analysis including pediatric, adult, and geriatric populations.

Material and Methods

This systematic review examined systematic reviews, meta-analyses, and original research from 2017 to 2021, comparing point-of-care LUS and CXR in diagnosing pneumonia among adults, pediatrics and geriatrics. Studies lacking direct comparison or exploring diseases other than pneumonia, case reports, and those examining pneumonia secondary to COVID-19 variants were excluded. The search utilized PubMed, Google Scholar, and Cochrane databases with specific search strings. The study selection, conducted by two independent investigators, demonstrated an agreement by the Kappa index, ensuring reliable article selection. The QUADAS-2 tool assessed the selected studies for quality, highlighting risk of bias and applicability concerns across key domains. Statistical analysis using Stata Version 16 determined pooled sensitivity and specificity via a bivariate model, emphasizing LUS and CXR diagnostic capabilities. Additionally, RevMan 5.4.1 facilitated the calculation of sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV), offering insights into diagnostic accuracy.

Results

The search, conducted across PubMed, Google Scholar, and Cochrane Library databases by two independent investigators, initially identified 1045 articles. Following screening processes, 12 studies comprised a sample size of 2897. LUS demonstrated a likelihood ratio of 5.09, a specificity of 81.91%, and a sensitivity of 92.13% in detecting pneumonia in pediatric, adult, and geriatric patients, with a p-value of 0.0002 and a 95% confidence interval, indicating diagnostic accuracy ranging from 84.07% to 96.29% when compared directly to CXR.

Conclusion

Our review supports that LUS can play a valuable role in detecting pneumonia early with high sensitivity, specificity, and diagnostic accuracy across diverse patient demographics, including pediatric, adult, and geriatric populations. Since it overcomes most of the limitations of CXR and other diagnostic modalities, it can be utilized as a diagnostic tool for pneumonia for all age groups as it is a safe, readily available, and cost-effective modality that can be utilized in an emergency department, intensive care units, wards, and clinics by trained respiratory care professionals.

Pulmonary Invasive Fungal Disease: Ultrasound and Computed Tomography Scan Findings

OBJECTIVE

The importance of ultrasound in diagnosing pulmonary invasive fungal diseases (IFD) has yet to be assessed. Thus, this study aimed to evaluate the frequency of sonographic findings in patients suspected of an invasive pulmonary fungal infection.

MATERIAL AND METHODS

This prospective longitudinal study examined all patients with lung lesions in imaging modalities and suspected IFDs referred to Dr. Sheikh and Akbar pediatric hospitals from 2019 to 2022. Considered variables were the halo sign in the computed tomography (CT) scan; the target sign in the ultrasound and contrast-enhanced CT scan; the cavity; wedge-shaped consoli- dation; and pleuritis and extrapulmonary invasion to the chest wall or subdiaphragmatic invasion in both modalities. All patients who underwent lung CT scans and ultrasounds until the final diagnosis were followed up. The degree of agreement between ultrasound and CT scan findings and the sensitivity, specificity, and diagnostic accuracy of these signs were assessed.

RESULTS

This study involved 40 patients with an average age of 7.16 ± 4.23 years. Acute leukemia was the commonest underlying dis- ease detected in 17 (42.5%) cases. The target sign in ultrasound (61.9%) and the halo sign in CT scan (71.4%) had the highest frequency among the variables in patients with IFD. Cohen's kappa coefficient agreement in both modalities was 0.5 for the cavity, with significant relation (P = .02). The Cohen's kappa was less than .17 for other findings (P > .05). The diagnostic criteria in the simultaneous examina- tion of the fungus target in ultrasound and halo in CT scan showed a sensitivity of 82.4% and specificity of 76.5%, respectively.

CONCLUSION

Combining the characteristic findings of ultrasound and CT-scan provides a higher value in diagnosing pulmonary invasive fungal disease.

Use of Lung Sonography in the Assessment and Confirmation of Pulmonary Complications in the Pediatric Patient

Objective:

To determine if lung sonography is accurate in assessing and confirming pulmonary compromise and thereby reduce the risk of x-ray exposure, for pediatric patients.

Materials and Methods:

This study was a systematic review of individual published studies. PubMed was the only database used for the article search. A review by a committee of contributors determined whether studies met the specific inclusion criteria. Studies reviewed had participants between the ages 0 and 18 years, with lung compromise of varying pathophysiological diagnoses. Each intervention was coded by levels of evidence; grading of recommendations, assessment, development, and evaluation (GRADE); the evidence alert traffic light grading system; and risk of bias in nonrandomized studies of interventions. Each article was evaluated using the Cochrane assessment of bias and GRADE evidence tables.

Results:

Thirty-seven articles were retrieved. Of those, 21 articles were removed following title and abstract screening. With 16 articles remaining, only one duplicate was removed. Based on the 15 articles extracted, in full-text versions, only two articles were noted to be irrelevant, and one article was not provided in English. Only 12 articles met the eligibility criteria, but two articles had to be removed because they were systematic reviews and not individual studies. The final analysis was based on 10 articles that met the inclusion criteria.

Conclusion:

Once reviewed, all 10 articles indicated that lung sonography had high accuracy and confirmation of lung compromise, which spanned multiple pulmonary diagnoses, in pediatric patients. When used by a trained clinician, lung sonography was as highly effective in comparison to other diagnostic tools, such as a chest radiograph and computed tomography.