An observational study in Difficult Airway, sponsored by National Cancer Institute, Egypt. Completed at 1 site in Egypt. Open to participants aged 18 Years to 70 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-04-28.
Sponsored by National Cancer Institute, Egypt · Observational
the goal of the observational study to measure the effectiveness of neck ultrasound in prediction of difficult intubation in adult patients
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
National Cancer Institute, Egypt is the lead sponsor of 133 studies on the registry; 29 are open to participants now.
Counted across the registry records on this site, refreshed daily.
all population undergoining surgical operation requiring general anesthesia and endotracheal intubation
Exclusion Criteria:
measurement of effectiveness of neck ultrasound use of ultrasound measurement in prediction of difficult intubation
In cormack lehan classification of laryngoscopy view
Time frame: 30 min after ultrasound measurements at time of induction of anesthesai
Hyomental distance in neutral position
In centimetres
Time frame: 30 min before operation
Throhyoid distance in neutral position
In centimetres
Time frame: 30 min before operation
Cricothyriod distance in neutral position
In centimetres
Time frame: 30 min before operation
Anterior soft tissue thickness at level of hyoid bone in neutral position
In centimetres
Time frame: 30 min before opeqrtio
Anterior soft tissue thickness at level of epiglottis in neutral position
In centimetres
Time frame: 30 min befor operation
Anterior soft tissue thickness at level of vocal cord in neutral position
In centimetres
Time frame: 30 min before operation
Hyomental distance in sniffing position
In centimetres
Time frame: 30 min before operation
Thyrohyoid distance in sniffing position
In centimetres
Time frame: 30 min before operation
Cricothyroid distance in sniffing position
In centimetres
Time frame: 30 minutes before operation
Anterior soft tissue thickness at level of hyoid bone in sniffing position
In centimetres
Time frame: 30 min before operation
Anterior soft tissue thickness at level of epiglottis in sniffing position
In centimetres
Time frame: 30 min before operation
Anterior soft tissue thickness at level of vocal cord in sniffing position
In centimetres
Time frame: 30 min before operation
Age
Years
Time frame: 30 min before operation
Plan to share: Yes
Supporting information: Study protocol
This study is completed, as verified in Apr 2026. You cannot join it, but the record below documents what was studied.
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National Cancer Institute, Egypt