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Bronchoalveolar lavage plus surfactant in a piglet model of meconium aspiration syndrome
Mauricio Obal Colvero1, Humberto Holmer Fiori, Renato Machado Fiori
1Department of Pediatrics, Hospital São Lucas, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, Brazil.
Introduction:
Meconium aspiration produces airway obstruction and surfactant inhibition. Bronchoalveolar lavage (BAL) and surfactant replacement have been proposed as treatments for the syndrome.
Objective:
To evaluate the effect of BAL with normal saline followed by a supplementary dose of surfactant in a piglet model of meconium aspiration syndrome.
Methods:
15 newborn piglets were used in the study. The animals were ventilated with fixed settings. After inhalation of 4 ml/kg of diluted meconium, the piglets were randomized into three groups: group I (n = 5) - tracheal aspiration without BAL; group II (n = 5) - BAL with normal saline (15 ml/kg), and group III (n = 5) - BAL with normal saline (15 ml/kg) followed by a supplementary dose of surfactant (Curosurf(R) 100 mg/kg). Arterial blood gas samples were obtained 30 min and 6 h after the inhalation of meconium.
Results:
A significant increase of PaO(2 )values at 6 h after treatment was only observed in group III (from 51 +/- 13 to 189 +/- 115 mm Hg; p = 0.04). At this time, PaO(2) in group III was significantly higher compared to group II (189 +/- 115 and 37 +/- 11 mm Hg, respectively; p = 0.023) and showed a borderline significance when compared to group I (p = 0.066).
Conclusion:
BAL with normal saline followed by a supplementary dose of surfactant may improve oxygenation in an experimental piglet model of meconium aspiration syndrome.
Insights
Bronchoalveolar lavage with saline and surfactant improved oxygenation in piglets with meconium aspiration syndrome. This treatment offers a potential therapeutic strategy for this condition.
Area of Science:
- Neonatal Medicine
- Respiratory Physiology
- Pediatric Critical Care
Background:
- Meconium aspiration syndrome (MAS) causes airway obstruction and impairs surfactant function.
- Bronchoalveolar lavage (BAL) and exogenous surfactant are potential treatments for MAS.
Purpose of the Study:
- To assess the efficacy of BAL with normal saline followed by surfactant administration in a piglet model of MAS.
- To evaluate the impact on gas exchange and oxygenation.
Main Methods:
- Newborn piglets inhaled diluted meconium.
- Animals were randomized into three groups: tracheal aspiration alone, BAL with saline, or BAL with saline plus surfactant.
- Arterial blood gas analysis was performed at 30 minutes and 6 hours post-treatment.
Main Results:
- The group receiving BAL with saline and surfactant showed a significant improvement in PaO2 at 6 hours (189 mmHg vs. 51 mmHg).
- Oxygenation in the surfactant-treated group was significantly higher than in the saline-only BAL group.
- A trend towards improved oxygenation was observed compared to the untreated group.
Conclusions:
- BAL with normal saline followed by surfactant may enhance oxygenation in experimental MAS.
- This combined approach demonstrates potential therapeutic benefits for MAS management.
