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Related Experiment Videos

Intrapulmonary terbutaline and aminophylline decrease lung liquid in fetal lambs.

D L Chapman1, D P Carlton, J J Cummings

  • 1Cardiovascular Research Institute, University of California, San Francisco 94143.

Pediatric Research
|April 1, 1991
PubMed
Summary
This summary is machine-generated.

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Phosphodiesterase inhibition, combined with beta-adrenergic stimulation, enhances fetal lung liquid absorption. This finding suggests a new approach for managing fetal lung development and potential respiratory issues.

Area of Science:

  • Perinatology
  • Pulmonary Physiology
  • Pharmacology

Background:

  • Fetal lung liquid secretion is crucial for lung development.
  • Beta-adrenergic stimulation influences lung liquid balance.
  • The role of phosphodiesterase inhibition in this process is not fully understood.

Purpose of the Study:

  • To investigate if phosphodiesterase inhibition enhances beta-adrenergic stimulation of fetal lung liquid secretion.
  • To determine the combined effects of terbutaline and aminophylline on fetal lung liquid production.

Main Methods:

  • Fetal lambs with tracheal loop catheters were used.
  • Net lung liquid production (Jv) was measured using an impermeant tracer (125I-albumin).
  • Independent and combined effects of terbutaline and aminophylline were assessed.

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Main Results:

  • Terbutaline alone decreased Jv, indicating reduced liquid secretion.
  • Aminophylline alone had no significant effect on Jv.
  • The combination of terbutaline and aminophylline further decreased Jv.
  • Amiloride, a sodium transport inhibitor, reversed the combined effect, increasing Jv.

Conclusions:

  • Phosphodiesterase inhibition potentiates the beta-adrenergic effect on fetal lung liquid absorption.
  • This effect is dependent on sodium transport.
  • Findings suggest a mechanism for modulating fetal lung fluid balance.