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Reassessing the role of milrinone in the treatment of heart failure and pulmonary hypertension in neonates and children: a systematic review and meta-analysis

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A CORRESPONDENCE to this article was published on 26 December 2023

Abstract

To evaluate milrinone’s impact on pediatric cardiac function, focusing on its specific role as an inotrope and lusitrope, while considering its systemic and pulmonary vasodilatory effects. Search of PubMed, EMBASE, and the Cochrane Library up to August 2023. We included all studies that evaluated milrinone in children under 18 years old in neonatal, pediatric, or cardiac intensive care units. We excluded case reports, studies that did not provide tabular information on milrinone’s outcomes, and studies focused on non-intensive care populations. We extracted data on the research design, objectives, study sample, and results of each study, including the impact of milrinone and any associated factors. We screened a total of 9423 abstracts and 41 studies were ultimately included. Milrinone significantly improved left ventricular ejection fraction (WMD 3.41 [95% CI 0.61 – 6.21]), left ventricle shortening fraction (WMD 4.25 [95% CI 3.43 – 5.08]), cardiac index (WMD 0.50 [95% CI 0.32 to 0.68]), left ventricle output (WMD 55.81 [95% CI 4.91 to 106.72]), serum lactate (WMD -0.59 [95% CI -1.15 to -0.02]), and stroke volume index (WMD 2.95 [95% CI 0.09 – 5.82]). However, milrinone was not associated with improvements in ventricular myocardial performance index (WMD -0.01 [95% CI -0.06 to 0.04]) and ventricular longitudinal strain (WMD -2.14 [95% CI -4.56 to 0.28]). Furthermore, milrinone was not associated with isovolumetric relaxation time reduction (WMD -8.87 [95% CI -21.40 to 3.66]).

Conclusion: Our meta-analysis suggests potential clinical benefits of milrinone by improving cardiac function, likely driven by its systemic vasodilatory effects. However, questions arise about its inotropic influence and the presence of a lusitropic effect. Moreover, milrinone’s pulmonary vasodilatory effect appears relatively weaker compared to its systemic actions. Further research is needed to elucidate milrinone’s precise mechanisms and refine its clinical applications in pediatric practice.

What is Known:

• Milrinone is a phosphodiesterase III inhibitor that has been used to treat a variety of pediatric and neonatal conditions.

• Milrinone is believed to exert its therapeutic effects by enhancing cardiac contractility and promoting vascular relaxation.

What is New:

• Milrinone may not have a significant inotropic effect.

• Milrinone's pulmonary vasodilatory effect is less robust than its systemic vasodilatory effect.

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Data availability

The datasets and analysis are available from the corresponding author on reasonable request.

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Acknowledgements

We thank all the colleagues at the NICU staff and CICU staff at the Faculty of Medicine of the University of São Paulo

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F.Y.M., V.L.J.K, C.V.C, W.B.C conceptualized and designed the study, reviewed and revised the manuscript. F.Y.M. and V.L.J.K collected data, carried out statistical analysis, interpreted the data, drafted the initial manuscript. C.V.C and P.V.V.G interpreted the data and reviewed the results. All authors approved the final manuscript.

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Correspondence to Felipe Yu Matsushita.

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Because this is a meta-analysis, patient consent was not required.

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Communicated by Peter de Winter

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Research in context

• Milrinone is a phosphodiesterase III inhibitor that is used to improve cardiac function and vascular tone in children and newborns with a variety of diseases. However, its mechanism of action is not fully understood.

• Recent studies suggest that milrinone may not have a significant inotropic effect, and its dual role as a systemic and pulmonary vasodilator can be challenging to manage.

• This meta-analysis aims to elucidate the precise mechanism of milrinone and to guide its optimal use in pediatric practice.

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Matsushita, F.Y., Krebs, V.L.J., de Campos, C.V. et al. Reassessing the role of milrinone in the treatment of heart failure and pulmonary hypertension in neonates and children: a systematic review and meta-analysis. Eur J Pediatr 183, 543–555 (2024). https://doi.org/10.1007/s00431-023-05342-0

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