Difficult Airway Prediction by Integrating STOP-BANG Criteria

NCT07493356 | Recruiting

• 1 other identifier: SIUT-ERC-2025/A-587
• Study Type: observational
• Target: 233
• Locations: 1 country
• Sites: 1

Brief Summary

This study is being done to determine the diagnostic accuracy of the STOP-BANG questionnaire in predicting difficult mask ventilation and intubation among obese patients. During the preoperative assessment, eligible participants will be enrolled in the study. The modified Mallampati score, thyromental distance, mouth opening, and upper lip bite tests will be performed along with STOP-Bang scores. Later in the operating room, general anesthesia will be given, and bag-mask ventilation and intubation grade will be assessed and recorded. A correlation will be assessed between the difficult airway assessment findings, along with the STOP-BANG score and the bas-mask difficulty scores and intubation grades.

Conditions

Intubation; Difficult or Failed; Ventilatory Defect

Keywords

Laryngoscopy; Ventilation of lungs; Bag-mask; General Anesthesia

Outcome Measures

Primary Outcomes (2)

• Adequate Bag-Mask Ventilation

  When an anesthetized patient is being manually ventilated by an anesthesia bag and a face mask and achieving a tidal volume of 5 ml/kg, it will be called adequate mask ventilation. * Easy if a single anesthesiologist achieves visible adequate chest rise and an end-tidal CO₂ graph. * Moderately difficult, if there is a slight chest rise, a low end-tidal CO₂ graph, but peripheral oxygen saturation is maintained above 97%. * Difficult if there is no visible chest rise, minimal or no end-tidal CO₂ graph, or if peripheral oxygen saturation drops to less than 95% but becomes normal with use of an oral airway (Guedel airway) or a laryngeal mask airway (LMA), or if two anesthesia providers are required for adequate mask ventilation. * Very difficult if peripheral oxygen saturation drops to 90% or less despite the use of airway adjuncts (Guedel airway or LMA).

  Only once, after giving general anesthesia but before an endotracheal tube is put in the trachea

• Difficult Tracheal Intubation

  Difficult tracheal intubation will be defined as, one that requires external laryngeal manipulation, laryngoscopy requiring more than 3 attempts at intubation, intubation requiring nonstandard equipment or approaches, or the inability to intubate at all

  Only once, after giving general anesthesia and 3-minute bag-mask ventilation for adequate muscle relaxation effect, then direct laryngoscopy will be performed to put the endotracheal tube in the trachea

Eligibility Criteria

• Age: 18 Years - 60 Years
• Sex: all
• Age Groups: Adult (18-64)
• Sampling Method: Non-Probability Sample

Study Population

* Male \& Female aged 18-60 years. * Body mass index 30 or more * American Society of Anesthesiologists (ASA) status II-III. * Scheduled for elective surgery under general anesthesia with endotracheal intubation.

You may qualify if:

• Male \& Female aged 18-60 years.
• Body mass index 30 or more
• American Society of Anesthesiologists (ASA) status II-III.
• Scheduled for elective surgery under general anesthesia with endotracheal intubation.

You may not qualify if:

• Patients' refusal to participate.
• American Society of Anesthesiologists (ASA) IV \& V.
• Neuromuscular diseases or facial abnormalities.
• Cardiothoracic, head and neck, or emergency surgery.
• Previously diagnosed with OSA (by polysomnography) will be excluded.
• Any airway-related anatomical deformity (e.g., Down's syndrome).
• History of radiation exposure.
• Patient with mouth opening \<2 fingers

Sponsors & Collaborators

• Sindh Institute of Urology and Transplantation: lead

Study Sites (1)

Sindh Institute of Urology and Transplantation

Karachi, Sindh, 74200, Pakistan

RECRUITING

Study Officials

• Syed M Abbas, FCPS

  Sindh Institute of Urology and Transplantation

  PRINCIPAL INVESTIGATOR

Central Study Contacts

Syed M Abbas, FCPS

CONTACT

02199215718; smabbas69@hotmail.com

Study Design

• Study Type: observational
• Observational Model: COHORT
• Time Perspective: CROSS SECTIONAL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Professor

Study Record Dates

• First Submitted: March 19, 2026
• First Posted: March 25, 2026
• Study Start: March 9, 2026
• Primary Completion (Estimated): September 8, 2026
• Study Completion (Estimated): September 8, 2026
• Last Updated: March 25, 2026

Record last verified: 2026-03

Data Sharing

• IPD Sharing: Will not share

Locations

PA (1)