Obese patients have a higher risk of anesthesia compared to the non-obese, including
difficult intubation, rapid desaturation, difficult vascular access, and delayed recovery
from anesthesia. This study aims to investigate the optimal anesthesia strategy for morbidly
obese patients undergoing bariatric surgery in airway management, preoxygenation, arterial
cannulation, and type of volatile anesthetic with M-Entropy guidance. The investigators will
conduct a two-year clinical trial using permuted block randomization to evaluate multiple
outcomes in patients undergoing laparoscopic sleeve gastrectomy (LSG) at Shuang Ho Hospital,
Taipei Medical University. Particularly, the investigators will explore the role of
ultrasound, an easily accessible modality for anesthesiologists, in examining upper airway
anatomy and guiding arterial cannulation. The investigators will also assess the
effectiveness of high-flow nasal cannula as a preoxygenation tool in preventing desaturation.