 hyperglycem coronari perfus hypothermia myocardi function cardiopulmonari bypass seri 84 anim experi hyperglycem perfus heart protect anox heart protect evalu ventricular function contractil forc studi observ aortic occlus 37 28 10 degre metabol data reveal consider myocardi glucos uptak higher coronari ph higher po lower pco glucos-perfus group compar control hypothesi protect alter metabol pathwai support myocardi enzym system associ high glucos concentr util 