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