General anesthesia was employed and maintained with isoflurane combined with intermittent intravenous administration of midazolam, fentanyl and vecuronium.

• 选用异氟烷、咪唑安定、芬太尼和维库溴铵行静脉吸入复合麻醉，维持合适麻醉深度和充分供氧。