Accuracy of Upper Lip Bite Test and Measurement of Skin-to-epiglottis Distance in Predicting Difficult Laryngoscopy: a Prospective Observational Study

Not yet recruiting

• Conditions: Upper Lip Bite Test; Difficult Laryngoscopy

• Registration Number: NCT05881694
• Lead Sponsor: Cairo University

Brief Summary

Airway management is one of the most important skills in everyday practice of anesthesia. Improper airway management might lead to high risk of mortality. clinical parameters alone cannot predict all potentially difficult airways. Ultrasonography (US) might play a role as a potential screening tool for difficult airway and given the limited empirical study in this field; this research will focus on using ultrasound to predict difficult airway and difficult mask ventilation for patients undergoing elective operation under general anesthesia. Methodology This study is Prospective observational . The study will be conducted in Cairo University Hospital Participants are adult patients (above \>40 years), (BMI \< 35) with American Society of Anesthesiologists physical status (ASA-PS) I-III, scheduled for elective surgery under general anesthesia with tracheal intubation . Exclusion criteria included patients with history of difficult intubation or apparent airway abnormalities (facial scars, neck scars, unstable cervical spine and history of cervical spine fixation) that would require alternative technique other than endotracheal intubation with direct laryngoscopy. Also, edentulous patients, patients undergoing emergency procedure and pregnant women are excluded from the study. Hypothesis The investigators hypothesize that combined class 3 ULBT and DSE \>2 cm can accurately predict difficult laryngoscopy in adult patients undergoing elective procedure under general anesthesia with endotracheal intubation.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2023-05-21
• Study First Submitted QC: 2023-05-21
• Study Start: 2023-05-30
• Study First Posted: 2023-05-31
• Status Verified: 2023-06
• Last Update Submitted: 2023-06-03
• Last Update Posted: 2023-06-06
• Primary Completion: 2023-10-01
• Study Completion: 2023-10-05

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 210

Inclusion Criteria

• Participants will be adult patients (above >40 years) ( BMI < 35) with ASA-PS I-III, scheduled for elective surgery under general anesthesia with tracheal intubation.

Exclusion Criteria

• Patients with history of difficult intubation or apparent airway abnormalities (facial scars, neck scars, unstable cervical spine and history of cervical spine fixation) that would require alternative technique other than endotracheal intubation.

Edentulous patients patients undergoing emergency procedure pregnant women were excluded from the study.

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
The accuracy of combined class 3 ULBT and DSE >2 cm in predicting difficult laryngoscopy	before start of anesthesia till intubation of the patient	The ULBT was performed by asking the patient to bite their upper lip with the lower incisors as high as they could While the patient was in supine position with the head in neutral position, the transducer was placed in the transverse plane at the level of the thyrohyoid membrane. The epiglottis was visible through the thyrohyoid membrane as a hypoechoic curvilinear structure with its posterior border demarcated by a bright hyperechoic linear air-mucosal interface. For each patient, the distance from the skin to the epiglottis was measured three times at the central axis of the epiglottis and the average of the measurement was calculated.