Milrinone for Hepatic Congestion and Diuresis

Mechanism of Action and Effects

Milrinone is a phosphodiesterase-3 inhibitor that increases intracellular calcium levels, enhancing myocardial contractility and cardiomyocyte relaxation while causing arterial and venous vasodilation 1

Hepatic congestion in heart failure results from elevated right-sided filling pressures and systemic venous congestion 3
By improving biventricular function and reducing pulmonary vascular resistance, milrinone can break the cycle of right ventricular failure that contributes to hepatic congestion 3

Milrinone can promote diuresis through improved cardiac output, which enhances renal perfusion 1

The American College of Cardiology recommends that intravenous inotropic drugs like milrinone might be reasonable for patients presenting with documented severe systolic dysfunction, low blood pressure, and evidence of low cardiac output to maintain systemic perfusion and preserve end-organ performance, with a Class IIb recommendation (might be reasonable) in patients with acute decompensated heart failure with evidence of decreased organ perfusion 2
Milrinone should be used at the lowest doses for the shortest duration, with progressive titration, as recommended by the American College of Cardiology 1

The American College of Cardiology states that use of parenteral inotropes in normotensive patients with acute decompensated heart failure without evidence of decreased organ perfusion is not recommended (Class III recommendation) 2

Assess for signs of low cardiac output and systemic hypoperfusion, and consider milrinone if patient has evidence of low cardiac output, as recommended by the American Heart Association 2
Consider milrinone if patient has biventricular failure with pulmonary hypertension, as recommended by the American College of Obstetricians and Gynecologists 3

Unlike dobutamine, milrinone does not depend on beta-adrenergic receptors, maintaining its action even when these receptors are down-regulated in heart failure, as noted by the Society of Critical Care Medicine 5
For hepatic congestion specifically, milrinone may be more effective than agents that primarily affect left ventricular function due to its beneficial effects on right ventricular function and pulmonary vascular resistance, as recommended by the American College of Obstetricians and Gynecologists 3