The cardiac muscle cells in the atrial and the ventricular walls exhibited obvious swelling and deformation, blurred cross striation, intracytoplasmic structural destruction of myofibrils, messy microfilaments, mitochondrial swelling, vacuolization and even dissolution. 心房和心室壁的心肌细胞明显肿胀变形,横纹不明显,胞质内肌原纤维结构破坏,肌丝散乱,线粒体肿胀,空泡化,甚至溶解;