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[Studies on surfactant replacement therapy in pediatric measles pneumonitis]
1Department Emergency and Critical Care Medicine, Osaka City General Hospital.
Abstract:
Measles pneumonitis, as well as encephalitis, is the most important complication associated with mortality in measles. Many medications including steroids and vitamin A have been applied to pediatric measles pneumonitis. However, the efficacy of such medication has not yet been established. This study is aimed at evaluating the effectiveness of surfactant replacement therapy in pediatric measles pneumonitis. Five patients (aged 1-2 years) with measles pneumonitis were transferred to our emergency center. On the transferred day, Surfactant-TA was administered by intratracheal method. After administration of surfactant, PaO2/FIO2 increased from 63.6 +/- 11.0 (mean +/- SE) to 206.2 +/- 54.1 in an hour and to 163.8 +/- 34.8 in 24. At the same time, the CO2 elimination and the dynamic compliance were improved. Because of these effects, the peak inspiratory pressure employed in mechanical ventilation could be reduced. It is concluded that surfactant replacement therapy can prevent the patients with measles pneumonitis from hypoxemia and ventilation-induced lung injury. However, further study is needed to maintain the improved oxygenation. Recently, it is reported that the effect of exogenous surfactant on oxygenation and activity of pulmonary neutrophils is regulated by the amount and/or concentration of administered surfactant. Therefore, it is an urgent issue to find out the optimum amount and concentration of exogenous surfactant used clinically.
Insights
Surfactant replacement therapy shows promise for treating pediatric measles pneumonitis, improving oxygenation and reducing ventilator pressure. Further research is needed to optimize surfactant dosage for sustained benefits.
Area of Science:
- Pediatric Pulmonology
- Critical Care Medicine
- Infectious Diseases
Background:
- Measles pneumonitis is a severe complication associated with measles mortality.
- Current treatments like steroids and vitamin A lack established efficacy.
- Hypoxemia and ventilation-induced lung injury are critical concerns in measles pneumonitis.
Purpose of the Study:
- To evaluate the effectiveness of surfactant replacement therapy in pediatric measles pneumonitis.
- To assess the impact of surfactant administration on gas exchange and respiratory mechanics.
Main Methods:
- Intratracheal administration of Surfactant-TA in five pediatric patients (1-2 years old) with measles pneumonitis.
- Monitoring of PaO2/FIO2 ratio, CO2 elimination, and dynamic lung compliance.
- Assessment of changes in peak inspiratory pressure during mechanical ventilation.
Main Results:
- Significant improvement in PaO2/FIO2 ratio within 1 hour and sustained at 24 hours post-surfactant administration.
- Enhanced CO2 elimination and improved dynamic lung compliance observed.
- Reduced peak inspiratory pressure required for mechanical ventilation.
Conclusions:
- Surfactant replacement therapy may prevent hypoxemia and ventilation-induced lung injury in pediatric measles pneumonitis.
- Further studies are required to determine optimal surfactant dosage and concentration for sustained oxygenation.
- Investigating the regulation of exogenous surfactant effects on oxygenation and pulmonary neutrophils is crucial.