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The goal of this clinical trial is to learn if an ultrasound-guided scalp block can improve intraoperative hemodynamic stability and provide better postoperative pain relief in adult patients undergoing elective supratentorial craniotomy. The main questions it aims to answer are: Does ultrasound-guided scalp block reduce changes in heart rate and blood pressure during surgery compared with surgical site infiltration? Does ultrasound-guided scalp block decrease postoperative pain and opioid requirements in the first 24 hours after craniotomy? Researchers will compare patients receiving an ultrasound-guided scalp block to those receiving standard surgical site infiltration to see if the scalp block provides better perioperative hemodynamic control and postoperative analgesia. Participants will: Receive general anesthesia with either ultrasound-guided scalp block or surgical site infil
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