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Pulmonary vasodilator drugs decrease lung liquid production in fetal sheep

J J Cummings1

  • 1Department of Pediatrics, State University of New York at Buffalo 14222, USA.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|October 1, 1995
PubMed
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Pulmonary vasodilatation agents, like acetylcholine and prostaglandin D2, were studied in fetal sheep. These agents increased pulmonary blood flow and decreased fetal lung liquid production.

Area of Science:

  • Fetal Physiology
  • Cardiovascular Research
  • Pulmonary Medicine

Background:

  • Fetal lung liquid production is crucial for lung development.
  • Pulmonary vascular resistance decreases significantly at birth.
  • Understanding factors influencing fetal lung liquid dynamics is important for perinatal outcomes.

Purpose of the Study:

  • To investigate the relationship between pulmonary vasodilatation and fetal lung liquid production.
  • To determine if agents causing pulmonary vasodilation affect fetal lung liquid balance.
  • To explore mechanisms relevant to the transition of pulmonary circulation at birth.

Main Methods:

  • Measurements of left pulmonary arterial flow (Qlpa) and net lung liquid production (Jv) in 20 fetal sheep.
  • Infusion of vasodilators: acetylcholine, prostaglandin D2, and FPL-55712.

Related Experiment Videos

  • Comparison with control saline infusions, with continuous monitoring of pulmonary arterial pressure.

    • Main Results:

    • Control infusions did not alter Qlpa or Jv.
    • All tested vasodilators significantly increased Qlpa and decreased Jv.
    • Pulmonary arterial pressure remained stable, indicating decreased pulmonary vascular resistance.

    Conclusions:

    • Agents that increase pulmonary blood flow via mechanisms active at birth also reduce fetal lung liquid production.
    • Pulmonary vasodilatation is linked to decreased lung liquid secretion in fetal lambs.
    • Findings suggest a coordinated physiological response in the transition to air breathing.