How neck measurements relate to airway checks to help in intubation

Is this trial a fit for you?

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

In this observational study, researchers will measure thyromental distance (TMD) and mandibular triangle perpendicular length (MTPL) and compare them with incisor vallecula distance (IVD) to see which correlates more strongly. The goal is to develop a regression equation that can predict IVD from external measurements and help select the appropriate laryngoscope blade size. The study focuses on preoperative airway assessment to improve the safety and ease of direct laryngoscopy and intubation. Eligible participants are adults 18–65 undergoing elective surgery with controlled ventilation and no predicted difficult airway. Exclusions include significant dental issues, tobacco use, or an anticipated difficult airway.

Why it matters

Who can join: the full rules

Inclusion Criteria:

1. Age 18-65 years
2. Males and females
3. ASA (American Society of Anaesthesiologists) physical status I and II
4. Patients scheduled for elective surgery with controlled ventilation through orotracheal tube conduit

Exclusion Criteria:

1. Smokers (those who have smoked ≥100 cigarettes in their lifetime), chewing tobacco dependence or substance abuse
2. Submucous fibrosis: progressive fibrosis of the submucosal tissue leading to rigidity, relative trismus, and progressive decrease of mouth opening
3. Anticipated difficult airway
4. Patients requiring intubation with MacIntosh blade #4 or #5
5. Dental issues:

   * missing tooth (upper/lower incisors, upper/lower premolar)
   * crowded dentition: - irregular, misaligned, or overlapping teeth within a relatively small oral cavity
   * presence of artificial teeth and/or dental implants

     • Mandible/mandibular structure related issues:
   * Retrognathia: - posterior displacement of the mandible relative to the maxilla or cranial base
   * Prognathia: - anterior displacement of the mandible relative to the maxilla or cranial base
6. Emergency Surgery
7. Those requiring urgent rapid-sequence intubation due to the presence of a full-stomach status secondary to gastro-esophageal reflux disease, diaphragmatic hernia, among others.
8. Refusal to informed consent

Where it's running

• Sir Ganga Ram Hospital
  New Delhi, National Capital Territory of Delhi, India Recruiting

Study contacts

• Principal investigator: Amitabh Dutta, MD — Sir Ganga Ram Hospital, New Delhi-110060, India
• Study coordinator: Amitabh Dutta, MD
• Email: duttaamitabh@yahoo.co.in
• Phone: 00919810848064

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

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How to take part

1. Review the eligibility criteria above with your treating physician.
2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.