To study the effect of measurements of the face and neck on difficulty in seeing the larynx during anaesthesia in adults

Active, not recruiting

Conditions: Difficult laryngoscopy

Registration Number: CTRI/2016/09/007313

Lead Sponsor: Safdarjung Hospital

Brief Summary: Unexpected difficult laryngoscopy (DL) or intubationor failed tracheal intubation is an importantaetiological factor in anaesthesia related morbidity and mortality. Severalanthropometric measurements have been proposed to identify potentially difficultairways. Amongst these, the thyromental distance (TMD) has been widely used inthe preoperative airway evaluation. The sensitivity and specificity of TMD as apredictor for difficult laryngoscopy is low and its role as a predictive testis debatable. As TMD will vary withpatient size, the ratio of height to TMD (RHTMD) may have a better predictivevalue than TMD alone, as the TMD cut-off value will be adjusted for patientsize.

The thyromental height (the height between the anterior borders of thementum and thyroid cartilage with the patient in supine position and mouth closed)has been suggested as predictor of difficult laryngoscopy.

The studyhypothesis is that the height between the anterior borders of the mentum andthyroid cartilage, the thyromental height, can be a predictor of difficultlaryngoscopy. The research question is to evaluate and compare the thyromentalheight, ratio of height to thyromental distance and thyromental distance forprediction of difficult laryngoscopy in adult patients undergoingelective surgery under general anaesthesia. The primary outcome measure iscalculation of the prediction index (cut off value) and validity indices for thethyromental height.

Detailed Description: Not available

Recruitment & Eligibility

Status: Closed to Recruitment of Participants

Sex: All

Target Recruitment: 300

Inclusion Criteria

American Society of Anaesthesiologists physical status grade I or II adult patients, scheduled to undergo elective surgery under general anaesthesia with tracheal intubation.

Exclusion Criteria

Patients with obvious abnormality of the airway requiring awake tracheal intubation 2.
Post burn contracture neck, neck swelling 3.
Interâ€‘incisor distance <2.5 cm 4.
Unstable cervical spine.

Study & Design

Study Type: Observational

Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
To determine the prediction index (cut-off value) and validity indices for thyromental height	At time of laryngoscopy and intubation

Secondary Outcome Measures

Name	Time	Method
1. To determine the validity indices for ratio of height to thyromental distance and thyromental distance for prediction of difficult laryngoscopy in adult patients.	2.To compare the thyromental height, ratio of height to thyromental distance and thyromental distance as predictors of difficult laryngoscopy in adult patients

Trial Locations

Locations (1): Safdarjung Hospital
🇮🇳
South, DELHI, India
Safdarjung Hospital
🇮🇳South, DELHI, India
Dr Smita Prakash
Principal investigator
09810347125
drsunilprakash@gmail.com