Related Experiment Videos
Inotropes improve right heart function in patients undergoing aortic valve replacement for aortic stenosis
Andrew D Maslow1, Meredith M Regan, Carl Schwartz
1From the Departments of Anesthesia and Surgery; Rhode Island Hospital, Providence Rhode Island; Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts.
Anesthesia and Analgesia
|March 26, 2004
Summary
Inotropes like epinephrine and milrinone improve heart function after aortic valve replacement surgery, particularly enhancing right ventricular performance. Their use is generally safe and beneficial for hemodynamics post-surgery.
Area of Science:
- Cardiology
- Cardiac Surgery
- Pharmacology
Background:
- The use of inotropes post-aortic valve replacement (AVR) for aortic stenosis (AS) is debated due to risks like left ventricular outflow obstruction and managing diastolic dysfunction.
- Left ventricular systolic function is often preserved or improved after AVR, complicating inotrope selection.
Purpose of the Study:
- To evaluate the hemodynamic advantages of inotropes in patients undergoing AVR for AS.
- To assess the impact of inotropes on both left and right ventricular function and diastolic parameters.
Main Methods:
- A prospective study randomized 34 patients into three groups: epinephrine, milrinone, or placebo.
- Hemodynamic and echocardiographic data were collected pre- and post-cardiopulmonary bypass (CPB).
- Ventricular preload was increased to evaluate inotropic effects on diastolic function.
Main Results:
- Inotropes significantly increased right and left ventricular ejection fractions and cardiac output post-CPB compared to placebo.
- Improvements in cardiac output were more closely linked to right ventricular ejection fraction changes than left ventricular.
- No patient receiving inotropes experienced left ventricular outflow obstruction; right ventricular function was better preserved with inotropes than placebo.
Conclusions:
- Both epinephrine and milrinone similarly enhanced biventricular performance post-AVR, with a more pronounced effect on right ventricular function.
- Inotropic drug choice should align with blood pressure and hemodynamic targets.
- The study did not reveal significant changes in diastolic function, possibly due to insufficient observation time.