简述急性外伤性硬脑膜外血肿的临床特点。
哪类患者麻醉前禁用吗啡或哌替啶() ["急性左心衰","高血压病","急性脑疝形成","肾功能不全","甲状腺功能亢进"]
复位单板不会引起通话中断的是() ["TUP","NOD","MPU","ISUP"]
颅内压增高患者麻醉中出现血压下降,脉搏增快时首先考虑() ["脑疝形成","麻醉过浅","严重缺氧","血容量不足","二氧化碳蓄积早期"]
回波抵消的作用?() ["抵消MSC-TMSC间的回声","抵消MSC-PSTN间二四线转换产生的回波。","减少拨打电话时的单通现象","抵消PSTN-MSC-PSTN间出现的回声"]
简述颅底骨折的临床表现。