Patients and study design
EGRI, mandibular subluxation, thyromental, Pre-anesthesia, head and neck mobility, weight, mouth opening
The present study was approved by the Ethics Committee of the Lu'an Hospital of Anhui Medical University (NO.2021LL005) and written informed consent forms were signed by all the participants or their relatives before enrollment. We recruited patients from the current hospital between July and September 2022. The trial was prospectively registered at the China Clinical Trial Registration Center (The inclusion criteria were as follows: (1) need for transoral tracheal intubation for general anesthesia during elective surgery in our hospital; (2) ASA class I and II; (3) 18–64 years of age; and (4) EI-Ganzouri risk index (EGRI) (weight, mouth opening, thyromental distance, possibility of mandibular subluxation, Mallampati class, head and neck mobility, history of difficult intubation) greater than or equal to 4 [Pre-anesthesia visits were performed by anesthesiologists not involved in this study, and age, sex, ASA classification, and body mass index were assessed and recorded in all cases. Most importantly, assessment of difficult airways using the EGRI was performed, including weight, head and neck mobility, mouth opening, possibility of mandibular subluxation, thyromental distance, Mallampati classification, and history of difficult intubation.