Saitama Municipal Hospital 1 article published in JoVE Medicine Postconditioning with Lactate-enriched Blood for Cardioprotection in ST-segment Elevation Myocardial Infarction Takashi Koyama1, Masahito Munakata1, Takashi Akima1, Kazutaka Miyamoto1, Hideaki Kanki1, Shiro Ishikawa1 1Department of Cardiology, Saitama Municipal Hospital Herein, we present a protocol for postconditioning with lactate-enriched blood, which is a novel approach for cardioprotection. This protocol comprises intermittent reperfusion and timely coronary injections of lactated Ringer's solution. This can be applied to ST-segment elevation myocardial infarction patients who undergo primary percutaneous coronary intervention.