苏先生,今晨因急性心肌梗死收入CCU,立即给予心电监护和氧气吸入。医生下班前开出:哌替啶50mg im q6h prn。该医嘱的有效期至
A. 6h
B. 12h
C. 24h
D. 48h
E. 医生注明停止时间
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