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Inhaled nitric oxide effects on lung structure and function in chronically ventilated preterm lambs.

Richard D Bland1, Kurt H Albertine, David P Carlton

  • 1Department of Pediatrics, Stanford University School of Medicine, CCSR Building, Room 1225, 269 Campus Drive, Stanford, CA 94305-5162, USA. rbland@stanford.edu

American Journal of Respiratory and Critical Care Medicine
|June 25, 2005
PubMed
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Continuous inhaled nitric oxide (iNO) in preterm lambs with chronic lung disease improved airway smooth muscle and enhanced alveolar development. This treatment reduced respiratory resistance and improved lung structure.

Area of Science:

  • Neonatal physiology
  • Pulmonary medicine
  • Respiratory research

Background:

  • Inhaled nitric oxide (iNO) is known to reverse pulmonary hypertension and bronchoconstriction.
  • iNO also reduces the proliferation of cultured arterial and airway smooth muscle cells.

Purpose of the Study:

  • To investigate the effects of continuous iNO from birth on pulmonary vascular resistance (PVR) and respiratory system resistance (RE).
  • To assess the impact of iNO on the growth of arterial and airway smooth muscle in preterm lambs with chronic lung disease.

Main Methods:

  • Eight preterm lambs received mechanical ventilation for 3 weeks, with four receiving iNO (5-15 ppm).
  • Four term lambs served as additional controls, mechanically ventilated without iNO.
  • Measurements included PVR, RE, smooth muscle abundance (SMart, SMtb), radial alveolar counts, and eNOS protein levels.

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Main Results:

  • iNO-treated preterm lambs showed significantly reduced respiratory system resistance (RE) compared to controls.
  • Airway smooth muscle (SMtb) was approximately 50% less in iNO-treated lambs.
  • Radial alveolar counts were more than double in iNO-treated lambs, indicating enhanced alveolar development.

Conclusions:

  • Continuous iNO administration from birth preserves airway smooth muscle structure and function in preterm lambs with chronic lung disease.
  • iNO enhances alveolar development, suggesting a protective role in lung maturation.
  • The findings support iNO as a potential therapeutic strategy for managing chronic lung disease in preterm infants.