一侧颈内动脉闭塞，临床可无症状，是因为() ["A．同侧颈外动脉未闭塞","B．对侧颈内动脉未闭塞","C．Willis环可迅速建立侧支循环","D．脑底动脉环有变异","E．双侧椎动脉未闭塞"]
急性脊髓炎如何预防褥疮发生?
下列关于心肌梗死的合并症的描述，哪一项是错误的() ["A．心脏破裂多见","B．可引起心源性休克","C．附壁血栓多见于左心室","D．室壁瘤较多见","E．常引起急性充血性心衰"]
何谓脊髓休克及急性脊髓炎的病因可能是?
下述哪种病变不会出现冠状动脉粥样硬化时（） ["心肌的变性和坏死","心肌内糖原沉积","心肌间质出血","心肌的代偿性肥大","心肌内纤维化"]
简述什么是上升性脊髓炎?
