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Kristian Wemmelund

Effects of Milrinone and Epinephrine or Dopamine on Biventricular Function and Haemodynamics in Right Heart Failure after Pulmonary Regurgitation

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OBJECTIVE: Right ventricular failure (RVF) secondary to pulmonary regurgitation (PR) impairs right ventricular (RV) function and interrupts the interventricular relationship. There are few recommendations for the medical management of severe RVF after prolonged PR.

DESIGN: PR was induced in 16 Danish landrace pigs by plication of the pulmonary valve leaflets. Twenty-three pigs served as controls. At re-examination the effect of milrinone, epinephrine and dopamine was evaluated using biventricular conductance and pulmonary catheters.

RESULTS: 79 days after PR was induced, RV end-diastolic volume index (EDVI) had increased by 33% (p=0.006) and a severe decrease in the load-independent measurement of contractility (PRSW) (-58%; p=0.003). Lower cardiac index (CI) (-28%; p<0.0001), mean arterial pressure (-15%; p=0.01) and mixed venous oxygen saturation (SvO2) (36%; p<0.0001) were observed compared to the control group. The interventricular septum deviated towards the left ventricle (LV). Milrinone improved RV-PRSW and CI and maintained systemic pressure while reducing CVP. Epinephrine and dopamine further improved biventricular PRSW and CI equally in a dose-dependent manner. Systemic and pulmonary pressures were higher in the dopamine-treated animals compared to epinephrine-treated animals. None of the treatments improved stroke volume index (SVI) despite increases in contractility. Strong correlation was detected between SVI and LV-EDVI, but not SVI and biventricular contractility.

CONCLUSIONS: In RVF due to PR, milrinone significantly improved CI, SvO2 and CVP and increased contractility in the RV. Epinephrine and dopamine had equal inotropic, but a greater vasopressor effect was observed for dopamine. SV was unchanged due to inability of both treatments to increase LV-EDVI.

Original languageEnglish
JournalA J P: Heart and Circulatory Physiology (Online)
Volume309
Issue5
Pages (from-to)H860-H866
Number of pages6
ISSN1522-1539
DOIs
Publication statusPublished - 19 Jun 2015

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