Ultrasound and Lip Bite Test for Predicting Difficult Airway in Obese Patients
Tests ultrasound measurements and a lip bite test to predict difficult intubation in obese adults.
Plain-language title generated from the registry record
Registry title: Combined Ultrasound and Upper Lip Bite Test Assessment of Difficult Laryngoscopy in Obese Patients
Key facts
- Where
- Cairo, EgyptSee the site
Could this be for you?
Answer for yourself. This is not a decision: only the study team can say whether you can take part.
- Are you between 18 and 65 years old?
Source: NCT07642206, who can take part
Where in Egypt
- Kasr Al-Ainy Hospital, Cairo UniversityCairo, EgyptNo longer taking part
Questions to ask the study team
- How often do I need to come in, and for how long each time?
- Are travel costs paid?
- Can I keep my own doctor?
- What happens if I want to stop?
Trial details
- Who runs it
- Cairo University
- Trial code
- NCT07642206
- Record updated
- 12 June 2026
- Original description
The aim of this observational study is to evaluate the accuracy of the HMDR combined with the ULBT as a predictor of difficult laryngoscopy in obese patients undergoing elective surgery under general anesthesia, regarding:Read full original descriptionShow less
Ultrasound-Measured Hyomental Distance Ratio Combined With the Upper Lip Bite Test as a Predictor of Difficult Laryngoscopy in Obese Patients: A Prospective Observational Study
The aim of this observational study is to evaluate the accuracy of the HMDR combined with the ULBT as a predictor of difficult laryngoscopy in obese patients undergoing elective surgery under general anesthesia, regarding:
* Correlation of HMDR-ULBT values with Cormack-Lehane grades during laryngoscopy. * Comparison of HMDR-ULBT with standard HMDR in predicting difficult laryngoscopy.
Inclusion: Adult obese patients aged 18 to 65 years; Both sexes; American Society of Anesthesiologists (ASA) physical status II- III; Body Mass Index (BMI) ≥ 30 kg/m² (classified as obese); Scheduled for elective surgical procedures requiring general anesthesia with endotracheal intubation; Ability to understand and provide informed written consent; Cooperative and able to perform the ULBT on command; Normal dentition (presence of upper and lower incisors to perform ULBT accurately).
Exclusion: History of maxillofacial trauma, surgery, or congenital facial anomalies affecting mandibular movement or neck anatomy; Patients with limited neck mobility (e.g., cervical spine disease or immobilization); Temporomandibular joint disorders or restricted mandibular mobility; Known or suspected difficult airway requiring awake intubation; Pregnancy.