Ultrasound Airway Examination as a Tool for Detection of Difficult Intubation in Adult Patients

April 27, 2026 updated by: National Cancer Institute, Egypt
the goal of the observational study to measure the effectiveness of neck ultrasound in prediction of difficult intubation in adult patients

Study Overview

Status

Completed

Conditions

Detailed Description

All participant undergoing elective surgery under general anesthesia will go a detailed preoperative sonographic assessment by the anesthesiologist who has experience in airway ultrasound for measurement of Hyomental distance, thyrohyoid distance, thyroid cricoid, anterior soft tissue thickness at levels of hyoid bone, cricoid cartilage and vocal cord and all measurement will be measured in neutral and sniffing position.

after induction of general anesthesia intubation will done by macintosh laryngoscope and degree of difficulty of intubation will be measured by cormack-lehane classification without any external manipulation

Study Type

Observational

Enrollment (Actual)

246

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Egypt
    • Cairo Governorate
      • Cairo, Cairo Governorate, Egypt, 12613
        • Cairo University

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

Yes

Sampling Method

Probability Sample

Study Population

all population undergoining surgical operation requiring general anesthesia and endotracheal intubation

Description

Inclusion Criteria:

  • Adult patients above18 years old
  • Both sex
  • Requiring general anesthesia with endotracheal intubation

Exclusion Criteria:

  • Emergency surgery,
  • patients with limited mouth, head or neck movement,
  • patients with temporomandibular joint impairment,
  • fracture or tumors of mandible,
  • patients requiring awake intubation,
  • uncooperative patients,
  • any cervical spine limitation movement
  • neck swelling or tumor
  • Prominent teeth deformities.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
measurement of effectiveness of neck ultrasound use of ultrasound measurement in prediction of difficult intubation
Time Frame: 30 min after ultrasound measurements at time of induction of anesthesai
In cormack lehan classification of laryngoscopy view
30 min after ultrasound measurements at time of induction of anesthesai

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Hyomental distance in neutral position
Time Frame: 30 min before operation
In centimetres
30 min before operation
Throhyoid distance in neutral position
Time Frame: 30 min before operation
In centimetres
30 min before operation
Cricothyriod distance in neutral position
Time Frame: 30 min before operation
In centimetres
30 min before operation
Anterior soft tissue thickness at level of hyoid bone in neutral position
Time Frame: 30 min before opeqrtio
In centimetres
30 min before opeqrtio
Anterior soft tissue thickness at level of epiglottis in neutral position
Time Frame: 30 min befor operation
In centimetres
30 min befor operation
Anterior soft tissue thickness at level of vocal cord in neutral position
Time Frame: 30 min before operation
In centimetres
30 min before operation
Hyomental distance in sniffing position
Time Frame: 30 min before operation
In centimetres
30 min before operation
Thyrohyoid distance in sniffing position
Time Frame: 30 min before operation
In centimetres
30 min before operation
Cricothyroid distance in sniffing position
Time Frame: 30 minutes before operation
In centimetres
30 minutes before operation
Anterior soft tissue thickness at level of hyoid bone in sniffing position
Time Frame: 30 min before operation
In centimetres
30 min before operation
Anterior soft tissue thickness at level of epiglottis in sniffing position
Time Frame: 30 min before operation
In centimetres
30 min before operation
Anterior soft tissue thickness at level of vocal cord in sniffing position
Time Frame: 30 min before operation
In centimetres
30 min before operation

Other Outcome Measures

Outcome Measure
Measure Description
Time Frame
Age
Time Frame: 30 min before operation
Years
30 min before operation

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

National Cancer Institute, Egypt

Investigators

  • Study Director: ayman ali ghoneim, MD in anesthesia, national cancer institute in egypt

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

March 20, 2023

Primary Completion (Actual)

March 1, 2026

Study Completion (Actual)

March 1, 2026

Study Registration Dates

First Submitted

November 11, 2024

First Submitted That Met QC Criteria

November 19, 2024

First Posted (Actual)

November 21, 2024

Study Record Updates

Last Update Posted (Actual)

April 28, 2026

Last Update Submitted That Met QC Criteria

April 27, 2026

Last Verified

April 1, 2026

More Information

Terms related to this study

Keywords

Other Study ID Numbers

  • Airway Ultrasound

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Sharing Time Frame

for 1 year

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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