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Respiratory status of infants with esophageal atresia
D A Cozzi1, P Capocaccia, M Roggini
1Pediatric Surgery Unit, Policlinico Umberto I, Università di Roma La Sapienza, Rome, Italy.
Insights
Respiratory distress in infants with esophageal atresia often occurs without lung opacities on chest X-rays. This condition is linked to airway obstruction, causing hypoxemia and atelectasis not visible on standard imaging.
Area of Science:
- Pediatric Pulmonology
- Neonatal Surgery
- Medical Imaging
Background:
- Esophageal atresia (EA) commonly presents with respiratory distress (RD).
- Lung opacities on chest radiography (CXR) are typically attributed as the cause of RD in EA infants.
- A disconnect between RD signs and CXR findings is observed in some EA cases.
Purpose of the Study:
- To investigate the underlying causes of respiratory distress in esophageal atresia patients presenting with normal chest radiographs.
- To correlate clinical manifestations and blood gas analysis with CXR findings in infants with EA.
Main Methods:
- Analysis of 41 infants diagnosed with esophageal atresia.
- Correlation of chest radiograph findings with clinical symptoms and arterial blood gas (ABG) data.
- Quantification of gas exchange abnormalities using the arterial/alveolar oxygen tension ratio (a-ARO2).
Main Results:
- 95% of infants (39/41) experienced respiratory distress.
- 44% of CXRs (130/294) showed no lung opacities.
- 87% of ABG samples (215/247) revealed an a-ARO2 below the normal limit of 0.75.
- Respiratory distress with clear CXRs was associated with signs of airway obstruction and low a-ARO2, indicating hypoxemia greater than hypercapnia.
Conclusions:
- In infants with EA, respiratory distress despite a clear CXR is primarily caused by tracheomalacia and upper airway obstruction.
- These conditions can lead to miliary atelectasis and intrapulmonary shunting, resulting in hypoxemia.
- Standard chest radiography may not detect these subtle abnormalities contributing to respiratory distress.
Abstract:
In infants with esophageal atresia (EA), lung opacities on a chest radiograph (CXR) are usually considered the cause of respiratory distress (RD). However, in some instances signs of RD and CXR changes show no correlation. The aim of this study was to investigate the pathogenesis of RD in EA patients with a normal CXR. In 41 infants with EA, CXR findings were correlated with clinical manifestations and blood-gas analysis data. The degree of abnormal gas exchange was quantitated by the arterial/alveolar oxygen tension ratio (a-ARO2). Of the 41 infants, 39(95%) presented with RD. No lung opacities were found in 130 of 294 CXRs examined (44%). An a-ARO2 below 0.75 (lower limit of normal) was calculated in 215 of 247 arterial blood samples analyzed (87%). When a temporal correlation was established, RD with a clear CXR was characterized by signs of extra- and intrathoracic airway obstruction, often associated with an a-ARO2 below 0.75. The degree of hypoxemia was greater than the degree of hypercapnia. We conclude that in infants with EA, RD with a clear CXR is related to both tracheomalacia and upper-airway obstruction that may cause miliary atelectasis not detected by conventional CXR with intrapulmonary shunting and hypoxemia.