Epinephrine and left atrial and left ventricular diastolic function decrease in normal subjects

BackgroundWe assessed the effect of epinephrine over left atrial and left ventricular diastolic function in subjects without structural heart disease.MethodsTwenty-seven, 34.6 ± 17.2 year-old patients without structural heart disease were included. Intravenous epinephrine (50 to 100 ng/kg/min) was infused. Left atrial and ventricular functions were evaluated by means of echocardiography before and during the epinephrine infusion.ResultsNo complications were observed. Significant increases in heart rate and systolic blood pressure were recorded. Both left atrial (minimal and maximal) volumes increased but increase in the minimal volume was more pronounced, and the ejection fraction diminished. Left atrial expansion index decreased and the fraction of left ventricular inflow volume resulting from atrial contraction increased. Two patients displayed abnormal left ventricular diastolic function. During epinephrine infusion, E/A and e′ decreased, and isovolumetric relaxation time increased.ConclusionsIn this group of young adults without structural heart disease, epinephrine infusion was safe, did not produce any complications, and induced a small but significant decrease in left atrial function and left ventricular diastolic function.