新生儿低体温在我国北方地区仍较常见，重者可致死亡〔１〕。肺出血是导致新生儿低体温死亡的最常见原因，约占５０％〔２〕。临床上患儿往往在复温中或体温恢复至正常后出现肺出血，对此尚无统一认识。本研究观察低体温对新生大鼠心肺病理变化的影响，探讨低体温所致心肌损伤? Neonatal hypothermia is still more common in northern China, severe cases can cause death 〔1〕. Pulmonary hemorrhage is the most common cause of hypothermia in newborns, accounting for about 50% (2). Clinically, children usually have pulmonary hemorrhage after rewarming or body temperature returned to normal, and there is no unified understanding about this. This study observed hypothermia in neonatal rat cardiopulmonary pathological changes, to explore hypothermia caused by myocardial injury?