Correlation of Neck Dimensions of Airway Evaluation
Trial statusRecruiting
Trial phaseNot listed
Trial typeObservational
Biological sexAll
Age18-65
SponsorSir Ganga Ram Hospital
About this trial
The goal of this observational study is to evaluate thyromental distance (TMD) and mandibular triangle perpendicular length (MTPL); to know which correlates better with the incisor vallecula distance (IVD). Based on the direction and strength of the correlation measure, a multiple regression equation can then be created to first predict the IVD with external linear measure, and second, based on IVD length prediction, the appropriate laryngoscope blade size can be ascertained.
Eligibility criteria
This trial does not accept healthy volunteersQualifiers
Age 18-65 years
Males and females
ASA (American Society of Anaesthesiologists) physical status I and II
Patients scheduled for elective surgery with controlled ventilation through orotracheal tube conduit
Disqualifiers
Smokers (those who have smoked ≥100 cigarettes in their lifetime), chewing tobacco dependence or substance abuse
Submucous fibrosis: progressive fibrosis of the submucosal tissue leading to rigidity, relative trismus, and progressive decrease of mouth opening
Anticipated difficult airway
Patients requiring intubation with MacIntosh blade #4 or #5
Trial population
Patients undergoing elective surgery under general anaesthesia
Trial design
Design model
Cohort
Time perspective
Prospective
Treatments tested in this trial
Not listed
Trial groups
No trial groups listed
Trial outcomes
Primary outcomes
1
Correlation of thyromental distance (TMD) and mandibular triangle perpendicular length (MTPL) with incisor vallecular distance (IVD)
In all patients thyromental distance (TMD) and mandibular triangle perpendicular length (MTPL) will be measured. TMD will be measured as a straight line distance between the bony mentum (tip of the chin) and the superior thyroid notch (upper border of the thyroid cartilage). MTPL will be measured as the perpendicular of the mandibular triangle formed by joining the mental protuberence and point at angle of mandible on either side. During direct larygngosocpoy when the tip of the laryngoscope blade lies on the vallecula, the distance between the laryngoscope blade tip and the point of laryngoscope blade flange overlying the lower incisors will be measured. A correlation between TMD and MTPL with IVD if any will be established.
Time frame
From entry into preoperative area (0 minutes) to time patient is shifted to operating room ( 10-minutes)Secondary outcomes
1
Correlation of incisor vallecular distance (IVD), mandibular triangle perpendicular length (MTPL), and thyromental distance (TMD) with Macintosh blade (MCB) size#3 length
Macintosh blade size # 3 length will be determined by measuring the linear distance between the tip of the blade and the point where the concave surface of the blade flange joins the heel of the the laryngoscope blade. A correlation between IVD, MTPL, and TMD with Macintosh blade size # 3 length if any will be established
Time frame
From induction of anaesthesia (0 minutes) to insertion of endotracheal tube ( 10-minutes)2
Cormack and Lehane score
The grade view to the glottic-opening upon direct laryngoscopy will be done using the 4-point Cormack-Lehane grading system (grade 1: entire glottic opening is seen; grade 2: anterior larynx not visualised, only posterior laryngeal aperture is seen; grade 3: only tip of epiglottis is seen; grade 4: neither glottis or epiglottis is visible, only soft palate is seen)
Time frame
From induction of anaesthesia (0 minutes) to insertion of endotracheal tube ( 10-minutes)Sponsors and contacts
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Source ClinicalTrials.gov