Using ultrasonographic skin-to-vocal-cord distance measurements to predict difficult intubation in obese patients: A prospective observational study

Status

Active, not recruiting

Phases

Unknown

Study type

Observational

Source

TCTR

Registry ID

TCTR20250616007

Enrollment

Registered

2025-06-16

Start date

2020-12-01

Completion date

Unknown

Last updated

2026-08-03

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

difficult intubation difficult laryngoscopy, difficult intubation, laryngoscopic view, obesity, airway ultrasound, airway management, neck anatomy, skin-to-vocal-cord distance

Interventions

Laryngoscopic view with Cormack Lehane grades 1 or 2,Laryngoscopic view with Cormack Lehane grades 3 or 4

Screening,Screening

Easy intubation ,Difficult intubation

Eligibility

Sex/Gender

All

Age

18 Years to 60 Years

Inclusion criteria

Inclusion criteria: 1.Obese patients with BMI equal to or greater than 30 kg/m2 2.Aged between 18 and 60 years 3.Scheduled for elective surgery under general anesthesia with oral endotracheal intubation 4.American Society of Anesthesiologists physical status 2 or 3

Exclusion criteria

Exclusion criteria: 1.Tracheostomy 2.Abnormalities or malignancies of the face, throat, or oral cavity 3.Cervical spine disease or injury 4.Head or neck tumors; prior intubation 5.Pregnancy 6.Inability to provide informed consent.

Design outcomes

Primary

Measure	Time frame
AUC of ultrasound skin to vocal cord distance during Ultrasonography centimeter	—

Secondary

Measure	Time frame
Time to successful tracheal intubation Intubation time from mouth opening to appearance of three consecutive end tidal CO2 waveforms second	—

Countries

Thailand

Contacts

Public ContactSumidtra Prathep

Prince of Songkla University

prathepsumidtra@gmail.com074451157

Outcome results

None listed

Source: TCTR (via WHO ICTRP) · Data processed: Aug 10, 2026