title: Acidic HEPES-KH reperfusion enhances myocardial protection in immature rabbits.
abstract: To study the effects of different pH HEPES-KH reperfusate solution on immature myocardial protection, isolated perfused Langendorff model from immature rabbit hearts were developed formed. Control group (C) was perfused only with pH 7.4 HEPES-KH solution for 90 min. Ischemia/reperfusion group (group I/R) was perfused with pH 7.4 HEPES-KH solution before ischemia or after ischemia. Experimental group (group E), after ischemia, was perfused with pH 6.8, pH 7.1 and pH 7.4 HEPES-KH solutions for 5 min, 5 min, and 20 min, respectively. The left ventricular function recovery, MWC, LDH and CK leakage, MDA, ATP content, and SOD activity were determined. Our results showed that the left ventricular function recovery, ATP content and SOD activity in group E were higher than those of group I/R (P < 0.05). MWC, MDA content, LDH and CK leakage in group E were lower than those of group I/R (P < 0.05). These findings suggested that pH paradox might be one of important mechanisms for immature myocardial ischemia-reperfusion injury, and acidic perfusate, at the beginning of reperfusion, might attenuate pH paradox and ameliorate functional recovery in isolated perfused immature rabbit hearts.
authors.affiliation: Department of Cardiovascular Surgery, Xiehe Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022.
authors.forename: Zhongdong
authors.initials: Z
authors.lastname: Sun
authors.forename: Chenyuan
authors.initials: C
authors.lastname: Yang
authors.forename: Jianzhou
authors.initials: J
authors.lastname: Xing
authors.forename: Tao
authors.initials: T
authors.lastname: Chen
authors.forename: Nianguo
authors.initials: N
authors.lastname: Dong
authors.forename: Jun
authors.initials: J
authors.lastname: Luo
mesh_terms: D000818:Animals; D002314:Cardioplegic Solutions / Q000494:pharmacology*; D005260:Female; D006321:Heart / Q000503:physiopathology*; D006324:Heart Arrest, Induced; D006863:Hydrogen-Ion Concentration; D008297:Male; D017202:Myocardial Ischemia / Q000378:metabolism* / Q000503:physiopathology; D015428:Myocardial Reperfusion Injury / Q000378:metabolism* / Q000503:physiopathology / Q000517:prevention & control; D009206:Myocardium / Q000378:metabolism; D011817:Rabbits; D011897:Random Allocation; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D002314:Cardioplegic Solutions; D013482:Superoxide Dismutase