一句医学英文的翻译When further analgesia was requested, bupivacaine 2

When further analgesia was requested, bupivacaine 20 ml was given, and the concentration was determined using the technique of up-down sequential allocation
当进一步镇痛被要求,给出了20毫升布比卡因 ,并且浓度的确定使用自上而下的连续配置（自上而下连续配置）的方法.
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When further analgesia was requested, bupivacaine 20 ml was given, and the concentration was determined using the technique of up-down sequential allocation
当我们需要更先进的止痛药时，我们给出了布比卡丁20毫升，浓度的多少要看采用该技...

当需要进一步的镇痛，给出了20毫升布比卡因 ，浓度也已经确定要使用自上而下的分配技术。