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【单选题】
患者,女,72岁。肺气肿病史15年。近日咳嗽、咳痰、气促、精神差。查体:口唇发绀,呼吸30次/分,神志恍惚,多汗和皮肤湿暖,肋骨上抬,肋间隙增宽;动脉血气分析:pH7.31, 55mmHg, 60mmHg。问题3:当护士采集血气分析标本时,其操作要点应除外
A.
立即采集立即送检
B.
使用2ml无菌干燥注射器
C.
抽吸低浓度肝素溶液，充盈注射器后弃去
D.
可穿刺桡动脉或股动脉
E.
将血迅速注入无菌试管内，用软木塞塞住
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