Clinical effects of the use of a novel oropharyngeal airway in painless gastroscopy in patients with obstructive sleep apnoea–hypopnoea syndrome: a randomised controlled trial protocol

Introduction Obstructive sleep apnoea–hypopnoea syndrome (OSAHS) is a sleep-related breathing disorder characterised by partial or complete obstruction of the upper respiratory tract. Owing to their relevant physiological anatomy, patients with OSAHS often experience severe respiratory complications, such as airway obstruction and hypoxaemia, during painless gastroscopy. In addition, the use of the shared airway approach increases the difficulty of airway management. At present, simple and effective tools for airway management for use during gastroscopy in clinical practice are lacking. Therefore, the aim of this study is to investigate whether a novel oropharyngeal airway designed for use in endoscopy can effectively relieve airway obstruction and prevent hypoxaemia. Method and analysis In this prospective, randomised, controlled clinical study, 130 patients with OSAHS diagnosed via polysomnography monitoring will be randomly divided into two groups. The experimental group will receive the novel oropharyngeal airway, whereas the control group will receive a conventional bite block. The primary outcome will be the incidence of hypoxia (75%≤SpO 2 (pulse oxygen saturation)