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Intravenous milrinone in cardiac surgery
Jerrold H Levy1, James M Bailey, G Michael Deeb
1Division of Cardiothoracic Anesthesiology and Critical Care, Emory University School of Medicine and Emory Healthcare, Atlanta, Georgia, USA. jerrold_levy@emory.org
Abstract:
Phosphodiesterase inhibitors including milrinone produce positive inotropic effects by slowing the hydrolysis of cyclic adenosine monophosphate in the myocardium. With a loading dose of 50 microg/kg followed by an infusion of 0.5 microg x kg(-1) x min(-1), milrinone increases stroke volume index and left ventricular velocity of circumferential fiber shortening after weaning from cardiopulmonary bypass. Milrinone has potential for the treatment and prevention of internal mammary artery spasm because of its vasodilative effect, which is similar to that of papaverine, and is a potent pulmonary vasodilator for patients with right ventricular dysfunction and pulmonary vasoconstriction. Low-dose milrinone may have antiinflammatory properties and potentially can improve splanchnic perfusion.
Insights
Milrinone, a phosphodiesterase inhibitor, enhances cardiac function and blood flow post-cardiac surgery. It also shows promise in preventing artery spasms and improving organ perfusion.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Phosphodiesterase inhibitors, such as milrinone, increase cyclic adenosine monophosphate (cAMP) levels in the myocardium.
- Elevated cAMP leads to positive inotropic effects, enhancing heart muscle contraction.
Purpose of the Study:
- To evaluate the effects of milrinone on hemodynamic parameters after cardiopulmonary bypass.
- To explore milrinone's potential in managing internal mammary artery spasm and pulmonary vasoconstriction.
- To investigate the anti-inflammatory and splanchnic perfusion effects of low-dose milrinone.
Main Methods:
- Administered a loading dose of 50 microg/kg followed by an infusion of 0.5 microg x kg(-1) x min(-1) milrinone.
- Monitored stroke volume index and left ventricular velocity of circumferential fiber shortening.
- Assessed milrinone's vasodilative properties, particularly in pulmonary circulation.
Main Results:
- Milrinone increased stroke volume index and left ventricular velocity of circumferential fiber shortening post-cardiac surgery.
- Demonstrated potent pulmonary vasodilation, beneficial for right ventricular dysfunction.
- Exhibited vasodilative effects similar to papaverine, suggesting utility in preventing internal mammary artery spasm.
- Low-dose milrinone may possess anti-inflammatory properties and improve splanchnic perfusion.
Conclusions:
- Milrinone is effective in improving cardiac performance after cardiopulmonary bypass.
- Milrinone offers therapeutic potential for pulmonary hypertension and internal mammary artery spasm.
- Further research into low-dose milrinone's anti-inflammatory and perfusion-enhancing effects is warranted.