This prospective observational study aims to evaluate the effects of sarcopenia on intraoperative neuromuscular block (NMB) in patients undergoing gastrointestinal cancer surgery. Adult patients scheduled for elective gastrointestinal cancer surgery will be grouped as sarcopenic or non-sarcopenic based on preoperative abdominal CT scans. Neuromuscular block parameters, including onset time, depth, duration, and recovery, will be objectively measured using TOF (Train-of-Four) monitoring. The study seeks to determine whether sarcopenia influences sensitivity to muscle relaxants and to contribute to individualized anesthesia management and patient safety.
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Onset Time of Neuromuscular Block
Timeframe: Intraoperative (from induction until adequate block is achieved)
Depth of Neuromuscular Block (TOF Ratio)
Timeframe: Intraoperative (from induction to end of surgery)
Duration of Neuromuscular Block
Timeframe: Intraoperative (from muscle relaxant administration to recovery)
Dose and Duration of Reversal Agent
Timeframe: Intraoperative (from administration of reversal agent to recovery)