Objective To compare the effects of hypothermia with multiple dose and single dose hyperkalemic crystalloid cardioplegic solution on energy metabolism and function of immature myocardium.

• 目的为了探讨未成熟心肌保护的方法，研究低温、多次和单次灌注高钾晶体心脏停搏液对未成熟心肌能量代谢和功能的影响。