Lung ultrasound in children with pneumonia: interoperator agreement on specific thoracic regions

The objective of this study was to evaluate the interoperator agreement of lung ultrasonography (LUS) on specific thoracic regions in children diagnosed with pneumonia and to compare the findings of the LUS with the chest X-ray. Participants admitted to the ward or PICU underwent LUS examinations performed by an expert and a novice operator. A total of 261 thoracic regions in 23 patients were evaluated. Median age and weight of participants were 30 months and 11.6 kg, respectively. A substantial overall agreement between operators was found for normal lung tissue (κ = 0.615, 95% confidence interval (95% CI) = 0.516–0.715) and for consolidations (κ = 0.635, 95% CI = 0.532–0.738). For B-lines, a moderate agreement was observed (κ = 0.573, 95% CI = 0.475–0.671). An almost perfect agreement was found for pleural effusion (κ = 0.868, 95% CI = 0.754–0.982). The diagnosis of consolidations by LUS showed a high sensitivity (93% for both operators) but a low specificity (14% for expert and 25% for novice operator). While intubated patients presented significantly more consolidations, nonintubated patients presented more normal ultrasound patterns.