HDAC9 and myocardial infarction: Given the cardioprotection offered by HDAC inhibition in previous studies [6,7] and the clinical need to improve outcomes after myocardial infarction, the objective of this systematic review was to analyse original research papers that have investigated the effects on ventricular function, cardiac remodelling, and infarct size, among other parameters, as well as, the mechanisms of action that could explain the cardioprotection offered by HDAC inhibitors in AMI.