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材料和方法 选用封闭群Ｗｉｓｔａｒ大鼠６０只，雌雄不拘，体重１８０～２２０ｇ，随机分为５组。Ⅰ组１０只为空白对照组，不做任何处理；Ⅱ组１０只为磁作用对照组，将表面磁感强度９０ｍＴ磁片埋于心前区皮下；Ⅲ组１２只为心肌梗死组，单纯手术复制ＡＭＩ模型；Ⅳ组１?
Materials and Methods Sixty closed-group Wistar rats were randomly divided into 5 groups, male and female, weighing 180-220 g. 10 rats in group Ⅰ were treated as blank control group, 10 rats in group Ⅱ as magnetic control group, and the magnetic field intensity of 90mT on the surface was buried subepithelium in the anterior heart region. Group Ⅲ was 12 rats in myocardial infarction group, Copy AMI model; Ⅳ group 1?