Postoperative low cardiac output syndrome has been shown to have both a central and a peripheral vascular involvement. Therefore, inodilators which provide with a combination of positive inotropic and vasodilating therapy, conceptually should be an ideal form of treatment. However, contradictory data on these drugs exist. Phosphodiesterase inhibitors (e.g., milrinone) and more recently calcium sensitizers (e.g., levosimendan) have been most commonly used groups in the clinical setting. This review will summarize the pharmacology of inodilators with a special foccus on current clinical evidence. This article addresses the sixth of eight topics comprising the special issue entitled "Pharmacologic strategies with afterload reduction in low cardiac output syndrome after pediatric cardiac surgery".
Objectives
To describe the use of ventricular assist devices (VAD) in children in Spain and to identify variables related to survival.
Methods
This is an observational cohort study of all children younger than 18 years of age who underwent an initial implantation of a VAD at any of the six paediatric heart transplant centers from May 2006 to December 2020. Subjects were identified retrospectively from each hospital's database.
Results
Paracorporeal VADs were implanted in 118 children (pulsatile [63%], continuous [30.5%] or both types [5.9%]). Small children (< 0.7 m2 of body surface area) comprised the majority of this cohort (63.3%). Overall, 67% survived to VAD explantation, and 64.9% survived to hospital discharge. Non-central nervous system haemorrhage (39%) and stroke (38.1%) were the most common complications. Body weight <5 Kg, congenital heart disease, pre-implantation bilirubin > 34 μmol/L and bridge to decision strategy, were associated with a higher mortality at hospital discharge and in the long-term. Interagency registry for mechanically assisted circulatory support (INTERMACS) status 1 and cardiac arrest prior to VAD implantation were related to long-term mortality, whereas pre-implantation renal replacement therapy and extracorporeal membrane oxygenation were not related to mortality.
Conclusions
In Spain, 67% of the VAD-supported children have been bridged to heart transplantation or to recovery. Body weight lower than 5 Kg, congenital heart disease diagnosis, cholestatic liver dysfunction, bridge to decision as VAD strategy, INTERMACS-1 status and cardiac arrest were pre-implantation variables related to mortality, whereas pre-implantation renal replacement therapy and extracorporeal membrane oxygenation were not.
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