NC/TMD Ratio as a Difficult Airway Predictor in Obese Patients

Neck Circumference to Thyromental Distance Ratio as a Reliable Indicator for Predicting Difficult Intubation in Obese Patients for Elective Surgery Under General Anesthesia

To assess accuracy of NC/TM distance ratio in terms of sensitivity, specificity, negative predictive value (NPV) and positive predictive value (PPV) for predicting difficult intubation in obese patient with Intubation difficulty score (IDS) as gold standard.

Study Overview

• Status: Recruiting
• Conditions: Difficult / Failed Intubation

Detailed Description

At Preanaesthesia clinic patients , neck circumference to Thyromental distance ratios of obese patients with BMI >30Kg/m2 will be calculated and patients will be divided into two groups on the basis of Nc/TMD ratio as anticipated easy intubation ( NC/TMD<5) And anticipated difficult intubation ( NC/TMD ≥5).

Intra-operatively, patients Intubation difficulty scale score will calculated and the data obtained from IDS score will be compared with NC/TMD ratio as a predictor of difficult Intubation and diagnostic accuracy of NC/TMD as a reliable indicator of difficult intubation in obese patients will be calculated by statistical analysis.

• Study Type: Observational
• Enrollment (Anticipated): 220

Contacts and Locations

• Study Contact: Name: Mahnoor Shabbir; Phone Number: +923315306277; Email: mahnoorbukhari94@gmail.com

Study Locations

• Pakistan
  • ICT
    • Islamabad, ICT, Pakistan, 44090
      • Recruiting
      • KRL Hospital
      • Contact: Dr Humaira Jadoon, Consultant Anesthetist; Phone Number: +923335241254; Email: drhumairajadoon@gmail.com
      • Principal Investigator: Mahnoor Shabbir, MBBS

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 65 years (Adult, Older Adult)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: All

• Sampling Method: Non-Probability Sample

Study Population

Obese patients (BMI ≥30Kg/m2) of all genders, between age of 18 to 65 years, belonging to ASA class I-III, Undergoing elective surgery under general anesthesia

Description

Inclusion Criteria:

1. ASA physical status I to III
2. Body Mass Index (BMI) of 30kg/m2 or more
3. age 18-65 years

Exclusion Criteria:

1. non consenting
2. ASA class greater than III,
3. patients undergoing general anesthesia without tracheal intubation or under regional anesthesia,
4. patients with upper airway pathology such as maxillofacial fractures, upper airway tumors or cervical spine fracture, obstetric patients, refusal of the patient, previous head and neck surgery or radiotherapy.

Study Plan

How is the study designed?

Number of groups / cohorts

2

Cohorts and Interventions

Group / Cohort
Group A (predicted easy intubation); Group A labelled as predicted easy intubation on the basis of NC/TM distance ratio <5
Group B (predicted difficult intubation); Group B labelled as predicted Difficult intubation on the basis of NC/TM distance ratio ≥ 5

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Predictability of difficult airway	At the preanaesthetic examination neck circumference to thyromental distance ratio will be caculated in obese patients with BMI ≥ 30KG/m2 and the predictability of difficult airway will be evaluated by statistical analysis	During anaesthesia induction

Collaborators and Investigators

• Sponsor: KRL Hospital, Islamabad
• Investigators: Principal Investigator: Mahnoor Shabbir, KrlH Islamabad

Study record dates

Study Major Dates

• Study Start (Actual): October 21, 2021
• Primary Completion (Anticipated): February 21, 2023
• Study Completion (Anticipated): February 21, 2023

Study Registration Dates

• First Submitted: February 9, 2023
• First Submitted That Met QC Criteria: February 9, 2023
• First Posted (Actual): February 21, 2023

Study Record Updates

• Last Update Posted (Estimate): February 23, 2023
• Last Update Submitted That Met QC Criteria: February 20, 2023
• Last Verified: February 1, 2023

More Information

Terms related to this study

• Keywords: difficult intubation; NC/TM distance ratio; intubation difficulty score
• Other Study ID Numbers: NC/TMD1

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No