Research Article

[Retracted] Study on the Effect of Different Doses of Hydromorphone on the Time Response and Postoperative Analgesia of Ropivacaine in Ultrasound-Guided Suprailiac Fascia Inguinal Block

Figure 1

General information and operation time comparison among the three groups. Note: compared with the L group, . Compared with the H1 group, .
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