Sternomental Displacement Test for Predicting Difficult Airway in Obese Patients

Sternomental Displacement and Neck Circumference as Predictors of Difficult Airway in Obese Patients During General Anesthesia: a Prospective Observational Cohort Study

Difficulties airway significantly contribute to the morbidity and mortality associated with anesthesia. Identifying situations and patients at risk for airway management problems is the key to optimal care and has been the focus of numerous publications. Although controversial, Body Mass Index (BMI) is considered as associated with difficult intubation in both and operating theaters. A modified measurement of SMD is obtained with the head in neutral position (SMD neutral), then the difference between SMD extension and SMD neutral was calculated and it was referred to as sternomental displacement (SMDD). SMDD was proved to be a good objective predictor for difficult laryngoscopy in adult patients, and its predictive ability was increased when combined with other tests as neck circumference (NC). To the best of our knowledge, the validity of the SMDD test was not previously assessed in obese patients.

Study Overview

• Status: Completed
• Conditions: Difficult Airway Intubation
• Intervention / Treatment: Diagnostic test: Sterno-mental displacement test

• Study Type: Observational
• Enrollment (Actual): 135

Contacts and Locations

Study Locations

• Egypt
  • Cairo, Egypt
    • Anesthesia department - Faculty of medicine- Cairo University

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 either sex, aged between 18-60 years old, ASA physical status II & III with BMI > 30 Kg/m2

Description

Inclusion Criteria:

• Patients of either sex, aged between 18-60 years old, ASA physical status II & III with BMI > 30 Kg/m2 undergoing elective surgical procedures under general anesthesia using endotracheal intubation by conventional laryngoscopy.

Exclusion Criteria:

• neuromuscular disorders, craniofacial abnormalities, abnormal dentition, lesions or scares in head and neck limiting the neck mobility, uncooperative, who needed awake intubation and patients who underwent emergency operations

Study Plan

How is the study designed?

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
A a cut-off value, sensitivity (Sn), specificity (Sp), positive predictive values (PPV), negative predictive values (NPV) of sternomental displacement in predicting difficult laryngoscopy in obese patient undergoing GA.	before induction of general anesthesia

Collaborators and Investigators

• Sponsor: Cairo University

Study record dates

Study Major Dates

• Study Start (ACTUAL): September 1, 2020
• Primary Completion (ACTUAL): February 20, 2021
• Study Completion (ACTUAL): April 30, 2021

Study Registration Dates

• First Submitted: August 20, 2020
• First Submitted That Met QC Criteria: August 21, 2020
• First Posted (ACTUAL): August 24, 2020

Study Record Updates

• Last Update Posted (ACTUAL): May 18, 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-141-2020

Drug and device information, study documents

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