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Surfactant lavage in a piglet model of meconium aspiration syndrome
M S Paranka1, W F Walsh, B B Stancombe
1Department of Pediatrics, Wilford Hall United States Air Force Medical Center, Lackland Air Force Base, Texas 78236-5238.
Abstract:
Meconium aspiration continues to be a major cause of morbidity and mortality in newborn infants and is one of the most common indications for extracorporeal membrane oxygenation. Lab studies have suggested that meconium inactivates surfactant and displaces surfactant from the alveolar surface. A recent report has suggested a clinical role for surfactant therapy in human infants with meconium aspiration. We evaluated the effect of surfactant (Survanta) lavage on a piglet model of meconium aspiration. Meconium pneumonitis was created by administration of 4 mL/kg of a 20% slurry of human meconium via endotracheal tube. Twenty-four newborn piglets were then randomly assigned to one of three groups: 1) suction only (n = 7), 2) saline lavage (n = 5), or 3) surfactant lavage (n = 7). Five piglets were excluded from analysis due to death from pneumothorax during meconium administration (n = 3), death from pneumothorax during saline lavage (n = 1), and death from pneumothorax during surfactant lavage (n = 1). The surfactant group had a statistically significant (p less than 0.05) improvement in arterial to alveolar oxygen ratio gradient versus both control groups for the first 3 h. The oxygenation index was statistically significant versus the suction only group at 1, 3, and 4 h. Surfactant lavage of meconium aspiration in piglets results in short-term improvement of oxygenation and warrants further study.
Insights
Surfactant lavage offers short-term oxygenation improvement in newborn piglets with meconium aspiration syndrome. This study suggests surfactant therapy may be a viable treatment for this serious condition.
Area of Science:
- Neonatal Medicine
- Pulmonary Medicine
- Pediatric Critical Care
Background:
- Meconium aspiration syndrome (MAS) is a leading cause of neonatal morbidity and mortality.
- Meconium can inactivate and displace pulmonary surfactant, impairing lung function.
- Extracorporeal membrane oxygenation (ECMO) is frequently required for severe MAS.
Purpose of the Study:
- To evaluate the efficacy of surfactant lavage in a piglet model of meconium aspiration.
- To assess the impact of surfactant therapy on gas exchange in MAS.
Main Methods:
- Meconium pneumonitis was induced in newborn piglets.
- Piglets were randomized into three groups: suction only, saline lavage, or surfactant lavage.
- Arterial to alveolar oxygen ratio gradient and oxygenation index were measured.
Main Results:
- The surfactant lavage group showed a significant improvement in the arterial to alveolar oxygen ratio gradient compared to control groups.
- Oxygenation index was significantly improved in the surfactant group versus the suction-only group at multiple time points.
- Short-term improvements in oxygenation were observed following surfactant lavage.
Conclusions:
- Surfactant lavage provides short-term improvement in oxygenation for meconium aspiration in a piglet model.
- These findings support further investigation into clinical surfactant therapy for MAS.
- Surfactant therapy warrants further study as a potential treatment for meconium aspiration syndrome.