Surfactant Function and Composition in Premature Infants Treated With Inhaled Nitric Oxide

@article{Ballard2007SurfactantFA,
  title={Surfactant Function and Composition in Premature Infants Treated With Inhaled Nitric Oxide},
  author={Philip L Ballard and Jeffrey D. Merrill and William E. Truog and Rodolfo I. Godinez and Marye H. Godinez and Theresa Mcdevitt and Yue-ji Ning and Sergio G. Golombek and Lance A. Parton and Xianqun Luan and Avital Cnaan and Roberta A. Ballard},
  journal={Pediatrics},
  year={2007},
  volume={120},
  pages={346 - 353}
}
OBJECTIVES. We hypothesized that inhaled nitric oxide treatment of premature infants at risk for bronchopulmonary dysplasia would not adversely affect endogenous surfactant function or composition. METHODS. As part of the Nitric Oxide Chronic Lung Disease Trial of inhaled nitric oxide, we examined surfactant in a subpopulation of enrolled infants. Tracheal aspirate fluid was collected at specified intervals from 99 infants with birth weights <1250 g who received inhaled nitric oxide (20 ppm… 
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TLDR
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TLDR
iNO causes dose-related increases in NO metabolites in the circulation as well as lung fluid, as evidenced by TA analysis, showing NO delivery to these compartments.
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TLDR
Treatment with iNO may have played a role in reducing several inflammatory and fibrotic mediators in TA of preterm infants compared to placebo-treated infants, however, survival without BPD was not affected in the main EUNO trial.
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TLDR
The authors' NO CLD study2 is included as 1 of 2 studies testing the effect of inhaled NO (iNO) started beyond the first 3 days of life with the primary outcome of improving survival without bronchopulmonary dysplasia (BPD) measured at 36 weeks' postmenstrual age.
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TLDR
It is concluded that many intubated premature infants are deficient in active surfactant, in part due to increased intra-alveolar metabolism, low SP-B content, and protein inhibition, and that the severity of this deficit is predictive of BPD.
Nitric Oxide for preterm infants
TLDR
The neuro-protective effect found in some experimental studies and clinical reports gives a new attractive potential indication of iNO use in this population of preterm infants, but current data of follow-up multicenter randomized controlled trials do not support this effect.
Late Surfactant Administration in Very Preterm Neonates With Prolonged Respiratory Distress and Pulmonary Outcome at 1 Year of Age: A Randomized Clinical Trial.
TLDR
Late surfactant administration did not alter the early course of bronchopulmonary dysplasia in infants with prolonged respiratory distress, however, surfactants-treated infants had reduced respiratory morbidity prior to 1 year of age.
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TLDR
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TLDR
It is concluded that surfactant is often dysfunctional in developing CLD secondary to SP-B deficiency, and NO treatment improves the apparent ability of hydrophobic SP to promote low surface tension, perhaps secondary to less protein inactivation of surfactan, and improves lung volume by a process unrelated to surfactants function.
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TLDR
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TLDR
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