Perineural dexamethasone does not enhance the analgesic efifcacy of ultrasound-guided subcostal tran

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BACKGROUND: Ultrasound-guided transversus abdominis plane(TAP) block is an adjunct therapy to provide effective postoperative analgesia in abdominal surgical procedures.Dexamethasone is a supplement agent that can improve the efficacy of local anesthesia.
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