Donor Heart Preservation with Hydrogen Sulfide: A Systematic Review and Meta-Analysis.

Preclinical studies have shown that postconditioning with hydrogen sulfide (HS) exerts cardioprotective effects against myocardial ischemia-reperfusion injury (IRI). The aim of this study was to appraise the current evidence of the cardioprotective effects of HS against IRI in order to explore the future implementation of HS in clinical cardiac transplantation. The current literature on HS postconditioning in the setting of global myocardial ischemia was systematically reviewed and analyzed, performing meta-analyses. A literature search of the electronic databases Medline, Embase and Cinahl identified 1835 studies that were subjected to our pre-defined inclusion criteria. Sixteen studies were considered eligible for inclusion. Postconditioning with HS showed significant robust effects with regard to limiting infarct size (standardized mean difference (SMD) = -4.12, 95% CI [-5.53--2.71], < 0.00001). Furthermore, HS postconditioning consistently resulted in a significantly lower release of cardiac injury markers, lower levels of oxidative stress and improved cardiac function. Postconditioning with slow-releasing HS donors offers a valuable opportunity for novel therapies within cardiac preservation for transplantation. Before clinical implication, studies evaluating the long-term effects of HS treatment and effects of HS treatment in large animal studies are warranted.