Thyromental Height Test (TMHT) as a Predictor of Difficult Airway in Obese Patients

Validity of Thyromental Height Test (TMHT) as an Objective Predictor of Difficult Airway in Obese Patients: a Prospective Observational Cohort Study

Difficult airway management is a major concern for anesthetists and contributes to perioperative morbidity and mortality. The incidence of difficult intubation in the obese population with a BMI of greater than 30 has been reported to be 15.8%. Thyromental height test (TMHT) is a new bedside test for difficult airway, it is a measure of the height between the anterior borders of the mentum and thyroid cartilage. TMHT can act as a surrogate for amount of mandibular protrusion; dimensions of submandibular space; and anterior position of the larynx. It appears promising as a single anatomical measure to predict the risk of difficult laryngoscopy.

Study Overview

• Status: Completed
• Conditions: Difficult Airway Intubation

• Study Type: Observational
• Enrollment (Actual): 105

Contacts and Locations

Study Locations

• Egypt
  • Cairo
    • Maadi, Cairo, Egypt, 11562
      • Abeer Ahmed

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 60 years (ADULT)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

• Sampling Method: Probability Sample

Study Population

Patients of both sex, aged between 18-60 years old, ASA physical status II& III with BMI > 30 Kg/m2 who will undergo elective surgical procedures under general anesthesia using endotracheal intubation using conventional laryngoscopy

Description

Inclusion Criteria:

• Patients aged between 18-60 years old, ASA physical status II& III with BMI > 30 Kg/m2 who will undergo elective surgical procedures under general anesthesia using endotracheal intubation with conventional laryngoscopy

Exclusion Criteria:

• Patients with neuromuscular disorders, craniofacial abnormalities, abnormal dentition, uncooperative, who need awake intubation and patients who undergoing emergency operations will be excluded

Study Plan

How is the study designed?

Number of groups / cohorts

1

Cohorts and Interventions

Group / Cohort
TMH test; Patient will be asked to lay supine while the head and neck maintained in a neutral position using a pillow under the head. By using digital depth gauge, the TMH will be measured from the anterior border of the thyroid cartilage directly on the thyroid notch till the anterior border of the mentum

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
TMHT	Validity of TMHT for prediction of difficult airway in obese patient undergoing general anesthesia	before induction of general anesthesia

Collaborators and Investigators

• Sponsor: Cairo University

Study record dates

Study Major Dates

• Study Start (ACTUAL): January 20, 2020
• Primary Completion (ACTUAL): January 20, 2020
• Study Completion (ACTUAL): January 20, 2021

Study Registration Dates

• First Submitted: December 23, 2019
• First Submitted That Met QC Criteria: December 24, 2019
• First Posted (ACTUAL): December 26, 2019

Study Record Updates

• Last Update Posted (ACTUAL): May 17, 2021
• Last Update Submitted That Met QC Criteria: May 14, 2021
• Last Verified: May 1, 2021

More Information

Terms related to this study

• Other Study ID Numbers: Ms-266-2019

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: UNDECIDED

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No