Neonatal Lung Ultrasound: RDS and Transient Tachypnea — B-lines and Consolidations
The available source fragments do not contain quantitative criteria and algorithms to differentiate Respiratory Distress Syndrome (RDS) and transient tachypnea of the newborn (TTN) based on lung ultrasound findings. Below is presented only what is directly substantiated by the provided materials.
Ultrasound Signs of Pulmonary Pathology (according to EFSUMB)
In the EFSUMB position statement on POCUS in primary care (Andersen et al., 2026), ultrasound signs of visceral pleura and lung pathology that a physician should recognize are listed:
- B-lines — as a focal pattern or as manifestation of interstitial syndrome;
- pleural thickening;
- pleural fragmentation;
- comet tail artifacts;
- consolidation;
- air bronchogram;
- fluid bronchogram.
These signs are presented as a general list of findings; the attribution of a specific pattern to RDS or TTN in the provided fragments is not described — [to be clarified].
Safety of Lung Ultrasound in Neonates
In the recommendations for safe application of lung ultrasound (Wolfram et al., ECMUS/EFSUMB, 2023), the references include a study on the safety of pulmonary ultrasonography in the neonatal intensive care unit (Jagta et al., 2018), as well as a review of pulmonary hemorrhage associated with diagnostic ultrasound (Rott, 1997). Specific safety threshold values from these fragments are not extracted — [to be clarified].
Limitation
For correct differentiation of RDS and TTN (character and density of B-lines, presence/absence of consolidations, pleural line status, zones of "preserved lung"), specialized neonatal lung ultrasound protocols are required, which are not present in this set of sources. It is recommended to refer to specialized consensus statements on neonatal lung ultrasound — [to be clarified].
Frequently asked questions
What ultrasound signs of pulmonary pathology should a physician know according to EFSUMB?
B-lines (focal pattern or interstitial syndrome), pleural thickening and fragmentation, comet tail artifacts, consolidation, air bronchogram, and fluid bronchogram (Andersen et al., 2026).
Are there B-line thresholds in the fragments to distinguish RDS from TTN?
No. Quantitative criteria and B-line thresholds for differentiating RDS and TTN are absent in the provided sources — [to be clarified].
What is known about the safety of lung ultrasound in neonates?
In the ECMUS/EFSUMB 2023 recommendations, a study on the safety of pulmonary ultrasonography in neonatal intensive care is mentioned (Jagta et al., 2018), as well as a review of pulmonary hemorrhage associated with diagnostic ultrasound (Rott, 1997); specific thresholds are not provided.
What are air bronchogram and fluid bronchogram?
These are ultrasound signs listed by EFSUMB (Andersen et al., 2026) among pulmonary pathology findings; their diagnostic interpretation in the context of RDS/TTN is not detailed in the available fragments — [to be clarified].