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Cardiopulmonary and inflammatory changes in adult rabbits with meconium aspiration
D Mokra1, A Calkovska, J Bulikova
1Department of Physiology, Jessenius Faculty of Medicine, Comenius University, Martin, Slovakia.
Background:
Pulmonary inflammation and vasoconstriction are important pathogenetic factors in neonatal meconium aspiration syndrome (MAS).
Objectives:
Study was performed to evaluate cardiopulmonary and inflammatory changes in adult rabbits after meconium administration.
Methods:
Animals were anesthetized and ventilated with room air. Initial values of cardiopulmonary parameters were recorded and blood samples taken. Three animals were then sacrifice and used as controls. The others were administered saline (4 ml/kg, n = 4) or meconium (25 mg/ml, 4 ml/kg, n = 5) and were further ventilated with 100% oxygen. When respiratory failure developed, parameters were recorded and animals were ventilated for additional 5 hours. Rabbits were then sacrifice and lungs excised. Right lungs were dried to determine wet/dry weight ratio and left lungs were lavaged with saline. Differential leukocyte count in the blood and lavage fluid sediment, and total blood leukocyte count were evaluated.
Results:
Instillation of meconium significantly decreased lung compliance, ventilation efficiency index and gas exchange, and increased right-to-left pulmonary shunts in comparison with saline group. No significant differences between groups were observed in mean blood pressure, heart rate, and central venous pressure. Meconium caused higher fluid and polymorphonuclear accumulation in the lungs, linked with decreased neutrophil and increased eosinophil counts in the blood.
Conclusions:
Adult rabbits may be used for experimental testing of drugs influencing lung inflammation and vasoconstriction in MAS (Tab. 1, Fig. 4, Ref. 16).
Insights
Adult rabbits exposed to meconium developed lung inflammation and impaired gas exchange, indicating their suitability for studying meconium aspiration syndrome (MAS) treatments.
Area of Science:
- Pulmonary Medicine
- Neonatal Research
- Animal Models
Background:
- Meconium aspiration syndrome (MAS) involves pulmonary inflammation and vasoconstriction.
- Understanding these mechanisms is crucial for developing effective treatments.
Purpose of the Study:
- To assess cardiopulmonary and inflammatory effects of meconium administration in adult rabbits.
- To validate adult rabbits as a model for MAS research.
Main Methods:
- Adult rabbits were administered saline or meconium.
- Cardiopulmonary parameters, gas exchange, and lung inflammation markers were measured.
- Leukocyte counts in blood and lung lavage fluid were analyzed.
Main Results:
- Meconium instillation significantly reduced lung compliance, ventilation efficiency, and gas exchange.
- Increased pulmonary shunts and inflammatory cell accumulation (polymorphonuclear cells) were observed.
- Blood analysis showed decreased neutrophils and increased eosinophils post-meconium exposure.
Conclusions:
- Adult rabbits exhibit significant pulmonary dysfunction and inflammation after meconium exposure.
- This model is suitable for evaluating therapeutic interventions for MAS.
- Further research can utilize this model to test drugs targeting lung inflammation and vasoconstriction in MAS.
