结论：HANS可以减轻甲状腺肿瘤患者手术时产生的心血管应激反应，同时有强化麻醉的作用。
Conclusion Cardiovascular stress response can be decreased with HANS in the operation of thyroid tumors and anesthetic effect can be strengthened.
说明中低平面的麻醉对循环功能仍有明显影响，辅助药则加重循环和呼吸抑制。提示完善术前准备，控制麻醉平面，强化术中管理是提高围手术期安全的保证。
The anesthesia at middle worsen of low level can obviously affect the circulatory function and the adjuvant can result in the worsen of inhibition of circulation and respiration.
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