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Paeds Vivasfetal-neonatal-and-perinatal

Paeds Vivas · fetal-neonatal-and-perinatal

Neonatal air-leak syndromes — branching viva

Branching viva on the unifying mechanism and classification of neonatal air leaks, recognition of the deteriorating ventilated preterm, emergency decompression, chest-drain management, and the prevention bundle.

branching clinical structured oral3 min readVerification in progress

Target exams

RACP DCEMRCPCH ClinicalRCPSC Pediatrics
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Target exams

RACP DCEMRCPCH ClinicalRCPSC Pediatrics
Prompt
A 27-week, 850 g infant on day 2 of life, ventilated for RDS, suddenly desaturates and becomes bradycardic. The left hemithorax is full with reduced air entry. The examiner asks: 'Walk me through your assessment and immediate management.'
Opening answer to give if asked to summarise

Neonatal air-leak syndromes share one mechanism: alveolar over-distension ruptures the terminal air sac, and air dissects along peribronchovascular sheaths (the Macklin effect) to collect at one of five sites — pleura (pneumothorax), interstitium (PIE), mediastinum, pericardium, or peritoneum. [3] In this ventilated preterm, the sudden deterioration with a full hemithorax and reduced air entry is a tension pneumothorax until proven otherwise; with a clear transillumination halo and hypotension, I would needle-aspirate before requesting a radiograph. [1] [9]

Branch 1 — The bedside assessment

Examiner: "You are called to the cot-side. Talk me through your assessment." [9]

  • Airway first: confirm ETT position at the lips and patency — the commonest cause of acute desaturation is a displaced or blocked tube. [1]
  • Chest movement and symmetry: look for asymmetry — the full, less-moving left hemithorax is the clue. [9]
  • Air entry: auscultate both axillae — reduced on the left. [9]
  • Heart sounds and apex: assess for muffling and apical shift (shifts away from a left tension leak toward the right). [9]
  • Perfusion and blood pressure: capillary refill, blood pressure, pulse pressure — narrowing pulse pressure and hypotension signal tension. [1]
  • Transilluminate: cold-light fibreoptic over the left anterior chest wall in a darkened room — a bright halo confirms the pneumothorax. [9]
If the examiner says the halo is equivocal

Name the pitfalls: in very small preterms light scatters easily (false positives), subcutaneous emphysema and PIE also transilluminate, and a very large leak can be misread. [9] In the unstable infant a clear halo is enough to act; if equivocal and the infant is crashing, the clinical picture of tension justifies empirical decompression. If the infant is stable, obtain the radiograph.

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References6ShowHide
  1. [1]Aziz K Part 5: Neonatal Resuscitation 2020 American Heart Association Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care. Pediatrics, 2021.PMID 33087555
  2. [3]Jeng MJ Neonatal air leak syndrome and the role of high-frequency ventilation in its prevention. J Chin Med Assoc, 2012.PMID 23158032
  3. [4]Rojas-Reyes MX Prophylactic versus selective use of surfactant in preventing morbidity and mortality in preterm infants. Cochrane Database Syst Rev, 2012.PMID 22419276
  4. [9]Huseynov M Neonatal pneumothorax from the perspective of a pediatric surgeon: classification and management protocol: a preliminary algorithm. Turk J Med Sci, 2021.PMID 33433972
  5. [11]Cates LA Pigtail catheters used in the treatment of pneumothoraces in the neonate. Adv Neonatal Care, 2009.PMID 19212159
  6. [12]Greenough A Pulmonary interstitial emphysema. Arch Dis Child, 1984.PMID 6508339
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