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Beta-adrenergic agonists increase lung liquid clearance in anesthetized sheep
The Journal of Clinical Investigation
|February 1, 1987
Summary
Beta-adrenergic agonists, like terbutaline and epinephrine, enhance lung liquid clearance in adult sheep. This effect is mediated by beta receptors and involves sodium transport, not changes in blood flow.
Area of Science:
- Pulmonary Physiology
- Pharmacology
Background:
- Lung liquid balance is crucial for respiratory function.
- Understanding mechanisms that enhance lung liquid clearance is important for treating pulmonary edema.
Purpose of the Study:
- To investigate if beta-adrenergic agonists increase lung liquid clearance in adult sheep.
- To determine if this effect is mediated by beta receptors and identify the underlying mechanism.
Main Methods:
- Instillation of autologous serum with or without beta-adrenergic agonists (terbutaline, epinephrine) into sheep lungs.
- Administration of beta-blockers (propranolol) and sodium channel blockers (amiloride) to assess mediation.
- Monitoring of lung liquid clearance, pulmonary hemodynamics, and lymph flow.
Main Results:
- Terbutaline and epinephrine significantly increased lung liquid clearance.
- The increase was inhibited by propranolol and amiloride.
- No significant changes were observed in pulmonary hemodynamics, blood flow, or lymph flow.
Conclusions:
- Beta-adrenergic agonists enhance lung liquid clearance in anesthetized adult sheep.
- The effect is mediated via beta receptors and likely involves active sodium transport across the alveolar epithelium.
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