New Method for Evaluation of Difficult Intubation in Adults

N/AActive Not RecruitingNCT07461792

Sohag University350 enrolled

Overview

There are multiple scores used for airway assesment ,the commonest one is LEMON score. LEMON is an airway assessment score that measures factors associated with difficult intubation such as obesity, head and neck movement, jaw movement , receding mandible, long upper incisors, Mallampatti scores, maxillary incisor characteristics, decreased mouth opening ,shorten thyromental distance and short neck. The Height-to-Thyromental Distance ratio (H/TMD) has emerged as a simple, objective, and reproducible anatomical predictor of difficult laryngoscopy, as it normalizes mandibular space to patient height. However, airway difficulty is not purely anatomical; functional factors such as airway obstruction and cervical spine mobility significantly affect intubation success. Therefore, combining H/TMD with two highly predictive functional elements from the LEMON score - Obstruction (O) and Neck Mobility (N) - may provide a more accurate, simplified, and clinically applicable model for predicting difficult airway. This combination is referred to as the HON Model (Height/TMD + Obstruction + Neck mobility).

Study Type

OBSERVATIONAL

Enrollment

350

Conditions

Difficult Airway Intubation

Interventions

evaluation of difficult intubation

The Height-to-Thyromental Distance ratio (H/TMD) has emerged as a simple, objective, and reproducible anatomical predictor of difficult laryngoscopy, as it normalizes mandibular space to patient height. However, airway difficulty is not purely anatomical; functional factors such as airway obstruction and cervical spine mobility significantly affect intubation success. Therefore, combining H/TMD with two highly predictive functional elements from the LEMON score - Obstruction (O) and Neck Mobility (N) - may provide a more accurate, simplified, and clinically applicable model for predicting difficult airway. This combination is referred to as the HON Model (Height/TMD + Obstruction + Neck mobility).

Eligibility

Sex: ALLMin age: 15 YearsMax age: 60 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: * Adult patients from 15- 60 yrs old * Patients who require endotracheal intubation for surgery under general anesthesia. * Patients with ASA I - II * Patients who provide informed consent Exclusion Criteria: * Patients with history of previous difficult intubation. * Patients with inability to sit/stand, heamodinamiclly unstable and need for rapid sequence induction .

Outcomes

Primary Outcomes

The primary outcome evaluate using Ratio of Patient's Height to Thyromental Distance Combined with Obstruction and Neck Mobility (HON Model) as a new practical scoring system in predicting Difficult Laryngoscopy .

Time frame: 30 minutes