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Ultrasound-Guided vs. Surgeon-Performed (Free-hand) Erector Spinae Plane Block
The aim of this study is to compare the analgesic efficacy of ultrasound-guided (USG) lumbar Erector Spinae Plane Block (ESPB) performed by an anesthesiologist versus a "free-hand" ESPB performed intraoperatively by the surgeon in patients undergoing Unilateral Biportal Endoscopic Discectomy (UBE). The investigators hypothesize that Us-guided would provide more effective analgesia, and USG-guided application might provide more precise local anesthetic spread.
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