This prospective, double-blinded randomized controlled trial aims to compare the efficacy of the serratus anterior plane block (SAPB) ultrasound guided versus anatomical landmark guided for gynecomastia surgery. And to detect if the anatomical landmark technique is inferior or not to the ultrasound guided technique. We hypothesize that anatomical landmark guided SAPB is not inferior to ultrasound guided SAPB.
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visual analouge score (VAS)
Timeframe: the first hour, postoperative