Totally 23 cases of traditional block anesthesia had pumpback blood，needing to change direction and reinject.
直
法有23例注
药前回抽有血，经改变方向后重新注;
Totally 23 cases of traditional block anesthesia had pumpback blood，needing to change direction and reinject.
直法有23例注药前回抽有血，经改变方向后重新注;
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