NCT04289597

Evaluation of Difficult Airway With Ultrasonography

Evaluation of Difficult Airway in Obese Patients With Ultrasonography

• Status: Completed
• Phase: —
• Study type: Observational
• Enrollment: 128 (actual)
• Sponsor: Eskisehir Osmangazi University · Academic / Other
• Sex: All
• Age: 18 Years – 65 Years
• Healthy volunteers: Accepted

Summary

As a result of anatomical and physiological changes in obese patients, airway management can be challenging. Ultrasound measurement of neck anterior soft tissues combined with recommended predictive tests may increase the ability to predict the difficult airway. In this study we planned to evaluate the measurement of neck anterior soft tissues by ultrasound in obese patients before anesthesia induction to anticipate difficult mask ventilation, difficult laryngoscopy, and intubation.

Detailed description

Patients with BMI\> 30, schedule elective surgery under general anesthesia, and give consent will be included in the study. In the preoperative evaluation, demographic data of the patients, airway physical examination results (mouth opening, Mallampati score, thyromental distance, neck circumference (from thyroid cartilage level), abnormal upper tooth presence, neck movement restriction\], presence of sleep apnea and STOP-BANG score will be recorded. In the patients taken on the operation table with supine position, ultrasound-guided soft tissue distances will be measured using ultrasound 6-13 Hz linear probe. The distance between the hyoid bone-skin (DSHB), the vocal cord anterior commissura-skin distance (DSAC), the minimum distance of the trachea to the skin at the level of the suprasternal notch (DST), the distance between the thyroid isthmus and the skin (DSI), and the distance between the epiglottis and the skin (DSE) will be measured and recorded. After standard monitoring and anesthesia induction, difficult mask ventilation will be evaluated with Han Scale \[(1) can be ventilated with a mask; 2) can be ventilated with the airway (with or without muscle relaxation); 3) difficult mask ventilation (insufficient, unstable, two practitioners are needed); 4) cannot be ventilated by mask\] and grade 3-4 will be recorded as difficult mask ventilation. Difficult laryngoscopy will be evaluated with Cormack Lehane Scale \[grade 1: vocal cords appear; grade-2: posterior commissura and epiglottis visible; grade-3: only epiglottis are seen; grade-4: glottic structures are not visible\] and grade 3-4 will be recorded as difficult laryngoscopy. Difficult intubation will also be evaluated with the number and duration of intubation attempts with the Macintosh blade. Tracheal intubation will be performed by an anesthesiologist who has at least two years of experience and unaware of ultrasound measurements. The duration of intubation (the time from the first handling of the laryngoscope until the capnography trace appeared) and the number of trials will be recorded.

Conditions

• Difficult Intubation
• Obesity

Interventions

Type	Name	Description
DIAGNOSTIC_TEST	Distance between hyoid bone-skin (DSHB)	Distance between hyoid bone-skin
DIAGNOSTIC_TEST	Vocal cord anterior commissura-skin distance (DSAC)	Vocal cord anterior commissura-skin distance
DIAGNOSTIC_TEST	minimum distance of the trachea to the skin at the level of suprasternal notch	Distance of the trachea to the skin at the level of suprasternal notch
DIAGNOSTIC_TEST	Thyroid isthmus-skin distance (DSI)	Thyroid isthmus-skin distance
DIAGNOSTIC_TEST	Skin-epiglottic distance (DSE)	Skin-epiglottic distance

Timeline

• Start date: 2020-08-20
• Primary completion: 2022-03-11
• Completion: 2022-03-11
• First posted: 2020-02-28
• Last updated: 2022-03-14

Locations

1 site across 1 country: Turkey (Türkiye)