Re-Dosing del Nido cardioplegia in adult cardiac surgery: Perfusion characteristics and outcomes--Is there an optimal redosing strategy?

Abstract

Objectives

del Nido cardioplegia is utilized for myocardial protection in adult patients undergoing cardiac surgery; however, no standardized re-dosing protocol exists. We describe perfusion characteristics and clinical outcomes in adult cardiac surgery patients who were re-dosed with del Nido cardioplegia.

Methods

Chart review was performed for adult patients undergoing cardiac surgery (specific inclusion/exclusion criteria below) who received exactly two doses of del Nido cardioplegia from 2012 to 2019; n = 542 patients. The main outcome was a composite endpoint comprised of operative mortality, myocardial infarction, post-operative cardiac support device (CSD), and postoperative decrease in ejection fraction (EF), which was analyzed via multivariable logistic regression (MVLR). A secondary analysis evaluated postoperative vasoactive-inotropic scores (VIS) via gamma log link regression (GLLR) as a more physiologic indication of myocardial recovery.

Results

MVLR demonstrated that increased total cardiopulmonary bypass (CPB) time was associated with a positive composite outcome (p < .001), whereas time between doses (p = .237) and the volume of each dose was not (p = .626). GLLR also demonstrated that prolonged CBP, decreased EF, congestive heart failure at time of surgery, and low hematocrit at the start of the surgery were all associated with higher VIS.

Conclusions

In this retrospective study, variations in re-dosing strategy for del Nido cardioplegia do not affect postoperative outcomes and increased CPB time is associated with increased operative mortality, myocardial infarction, need for post-operative CSDs, and reduced postoperative EF, and increased VIS, irrespective of the re-dosing strategy. Further studies are warranted to to identify additional patient and operative characteristics that predispose to complications.

Graphical Abstract

Keywords

perfusion cardioplegia myocardial protection del Nido

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