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患者男，78岁，因肺癌在支气管内下行肺叶切除，有十多年慢性支气管炎、肺气肿病史。咳嗽，痰量较多，术前测肺功能提示中重度通气功能障碍。高血压病史15年，不规则服用抗高血压药物，术前血压控制不够理想。冠心病心绞痛史2年。患者要求术后手术切口无痛或尽可能不痛，并能及早苏醒见到家人。提示：术中行右单肺通气，SpO 2 保持在97％以上，50分钟后气道阻力逐渐增大，患者SpO 2 下降，不能维持在93％以上：听诊肺呼吸音清晰。提问：下列措施哪些应优先予以考虑？（）A.
纤维支气管镜检查双腔管的位置
B.
使用氨茶碱
C.
侧肺行PEEP
D.
肺CPAP与患肺PEEP结合
E.
患肺持续吹氧
F.
间断双肺通气
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