Direct Versus Video Laryngoscopy in Patients With Acromegaly

This prospective observational study will be conducted at Basaksehir Cam and Sakura City Hospital between July 1, 2026, and August 31, 2026. The study population will include adult patients with acromegaly and adult patients with nonfunctioning pituitary adenomas who are scheduled for elective surgery under general anesthesia requiring endotracheal intubation.

Eligible patients will undergo routine preoperative airway assessment. Recorded variables will include age, sex, height, body weight, body mass index, history of obstructive sleep apnea syndrome, comorbid diseases, previous operations, presence of hypopituitarism, preoperative growth hormone level, preoperative insulin-like growth factor-1 level, IGF-1 index, Mallampati score, and other airway-related clinical parameters.

During airway management, laryngoscopic findings obtained with direct laryngoscopy and video laryngoscopy will be recorded. The modified Cormack-Lehane classification will be used to assess glottic visualization. Intubation-related variables, including first-attempt success, time to successful intubation, number of intubation attempts, need for adjunct airway maneuvers or devices, oxygen desaturation, and airway trauma, will also be documented.

The primary objective of the study is to compare laryngoscopic findings and intubation characteristics in patients with acromegaly and to evaluate whether video laryngoscopy provides advantages over direct laryngoscopy in this patient group. The secondary objective is to identify clinical, hormonal, and airway-related predictors of difficult laryngoscopy or difficult intubation in patients with acromegaly.

Inclusion criteria

• Age 18 years or older
• Diagnosis of acromegaly and scheduled for surgery after evaluation by the institutional pituitary diseases council
• Diagnosis of nonfunctioning pituitary adenoma and scheduled for surgery after evaluation by the institutional pituitary diseases council
• Requirement for general anesthesia with endotracheal intubation
• Ability and willingness to provide written informed consent

Exclusion criteria

• Age younger than 18 years
• Refusal to participate in the study
• Presence of extrapituitary malignancy
• Emergency surgery
• Previous tracheostomy or major laryngeal/tracheal surgery
• Severe limitation of mouth opening preventing standard laryngoscopic evaluation
• Cervical spine instability or severe restriction of neck extension
• Patients requiring awake fiberoptic intubation according to preoperative airway assessment
• Patients for whom participation is considered unsafe by the responsible anesthesiologist