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Related Experiment Videos

Milrinone and the pulmonary vascular system.

M N Harris1, A K Daborn, J P O'Dwyer

  • 1St Thomas' Hospital, London, United Kingdom.

European Journal of Anaesthesiology. Supplement
|January 1, 1992
PubMed
Summary

Milrinone effectively reduced pulmonary artery pressure and vascular resistance in post-cardiac surgery patients. Its efficacy in improving cardiac index varied based on baseline pulmonary vascular resistance, showing greater initial benefits in specific patient groups.

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Area of Science:

  • Cardiology
  • Pharmacology
  • Critical Care Medicine

Background:

  • Post-operative cardiac failure is a significant concern in adult patients following cardiac surgery.
  • Management of cardiac failure often involves optimizing hemodynamic parameters like pulmonary capillary wedge pressure and cardiac index.
  • Milrinone is a phosphodiesterase-3 inhibitor used to improve cardiac contractility and vasodilation.

Purpose of the Study:

  • To assess the hemodynamic effects of milrinone in adult patients experiencing post-operative cardiac failure after cardiac surgery.
  • To evaluate the impact of milrinone infusion rates on pulmonary artery pressure, pulmonary vascular resistance, and cardiac index.
  • To investigate potential differences in milrinone's efficacy based on baseline pulmonary vascular resistance and surgical procedure.

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Main Methods:

  • A multicenter study involving 99 adult patients with post-operative cardiac failure (pulmonary capillary wedge pressure > 8 mmHg, cardiac index < 2.5 L/min/m²).
  • Administration of a milrinone bolus (50 µg/kg) followed by infusion at 0.375, 0.5, or 0.75 µg/kg/min.
  • Retrospective analysis of 39 patients from two centers, categorized into three groups based on baseline pulmonary vascular resistance and surgical type (mitral valve replacement vs. coronary revascularization).

Main Results:

  • Milrinone significantly reduced mean pulmonary artery pressure (15%) and pulmonary vascular resistance (30-40% at 12h), effects reversible upon withdrawal.
  • All patient groups showed significant reductions in pulmonary vascular resistance and increases in cardiac index.
  • Patients with high baseline pulmonary vascular resistance undergoing mitral valve replacement demonstrated greater initial improvements in pulmonary vascular resistance and cardiac index compared to other groups.

Conclusions:

  • Milrinone is effective in improving hemodynamic parameters in post-cardiac surgery patients with cardiac failure.
  • The drug demonstrates significant reductions in pulmonary artery pressure and pulmonary vascular resistance.
  • Initial response to milrinone, particularly regarding pulmonary vascular resistance and cardiac index, may be influenced by baseline pulmonary vascular resistance and surgical procedure.