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Pulmonary insufficiency produced by norepinephrine: a comparison with epinephrine
Circulatory Shock
|January 1, 1977
Summary
Norepinephrine infusion in dogs significantly increased pulmonary shunt, cardiac output, and pulmonary artery pressure. These findings suggest adrenergic stimulation contributes to pulmonary insufficiency in shock.
Area of Science:
- Cardiovascular Physiology
- Pulmonary Medicine
- Pharmacology
Background:
- Adrenergic stimulation is implicated in shock-related pulmonary insufficiency.
- Understanding the specific effects of different adrenergic agents is crucial.
Purpose of the Study:
- To investigate the hemodynamic effects of norepinephrine infusion in anesthetized, mechanically ventilated dogs.
- To compare the pulmonary and cardiovascular effects of norepinephrine with those of epinephrine.
Main Methods:
- Intravenous infusion of norepinephrine (2 microgram/kg/min) for 5 hours in dogs.
- Monitoring of pulmonary shunt, cardiac output, pulmonary artery pressure, pulmonary wedge pressure, and pulmonary vascular resistance.
- Hemodynamic data were analyzed for statistically significant changes.
Main Results:
- Norepinephrine significantly increased pulmonary shunt, cardiac output, and mean pulmonary artery pressure.
- Pulmonary wedge pressure and pulmonary vascular resistance showed no significant changes, except at the 5-minute mark.
- Hemodynamic changes were qualitatively similar to epinephrine, but magnitude differences were not statistically significant.
Conclusions:
- Norepinephrine administration impacts key hemodynamic parameters relevant to pulmonary function.
- Adrenergic agents like norepinephrine and epinephrine share similarities but may have distinct quantitative effects.
- Further research is needed to confirm real differences in the magnitude of hemodynamic changes between norepinephrine and epinephrine.