Totally 23 cases of traditional block anesthesia had pumpback blood，needing to change direction and reinject.
直接麻醉法有23例注
麻药前
抽有血，经改变方向后重新注;
;抽Totally 23 cases of traditional block anesthesia had pumpback blood，needing to change direction and reinject.
直接麻醉法有23例注麻药前抽有血，经改变方向后重新注;
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