Study population
atopy, tumor
RESPIRATORY DISEASE, MAY, TUMOR, ATOPY
First, all patients scheduled to undergo elective laparoscopic gynecologic tumor resection at the First Affiliated Hospital of Medical College, Shihezi University, China, from 12 October 2022 to 13 May 2023, were recruited. Next, only patients aged 40–75 years and met the American Society of Anesthesiologists’ (ASA) physical status I-II were included in the study. Patients with a history of respiratory disease, surgery, smoking, or recent use of drugs that can affect BTV (adrenergic receptor antagonists, hormones, anticholinergic drugs, theophylline, and catecholamines) predicted airway difficulty, and atopy were excluded from the study.