Determining the Depth of Endotracheal Tube Insertion

1. Airway length from the medial incisor to carina is divided into four segments ; the length from medial incisor to mouth angle, mouth angle to epiglottis, epiglottis to vocal cords and vocal cords to carina.
2. Determining the mean length of each segments with the direct laryngoscope, videolaryngoscope and fiberoptic bronchoscope at the time of endotracheal intubation.
3. Making a new formula to determine the proper individualized depth of intubation on the basis of the length of segments
4. Virtual experiment : comparing the new formula with conventional method of determining the depth of endotracheal intubation

Study Overview

• Status: Completed
• Conditions: Endotracheal Intubation; Individualized Depth of Endotracheal Intubation

• Study Type: Observational
• Enrollment (Actual): 176

Contacts and Locations

Study Locations

• Korea, Republic of
  • Daejeon, Korea, Republic of, 301-723
    • Department of Anesthesia and Pain Medicine, Daejeon St Mary's hospital

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 20 years to 90 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

• Sampling Method: Probability Sample

Study Population

Patients who are taking operation in the university hospital

Description

Inclusion Criteria:

• Patients who are scheduled to take general anesthesia with endotracheal intubation

Exclusion Criteria:

• Patients undergoing general anesthesia with face mask ventilation or laryngeal mask airway

Study Plan

How is the study designed?

Number of groups / cohorts

1

Cohorts and Interventions

Group / Cohort
Conventional group, Touch and Read group

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Comparison of Airway Length Between Male and Female	Airway length is defined the distance from medial incisor to carina. It is divided into four parts. It is medial incisor to mouth angle, mouth angle to epiglottis tip, epiglottis tip to vocal cords and vocal cords to carina.	Endotracheal intubation time
Airway Length vs Height in Male		Endotracheal intubation time
Airway Length vs Height in Female		Endotracheal intubation time

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Comparison Between Conventional Method and Touch and Read Method for Risk Group of Male	Normal group is defined as the patients whose airway length from medial incisor to carina is below 25cm. Conventional method : depth of intubation is 23cm at the medial incisor for male. Touch and read method : depth of intubation is calculated as follow : length from mouth angle to epiglottis tip plus 12.5cm for male.	Endotracheal intubation time
Comparison Between Conventional Method and Touch and Read Method for Normal Group of Male	Normal group is defined as the patients whose airway length from medial incisor to carina is over 25cm. Conventional method : depth of intubation is 23cm at the medial incisor for male. Touch and read method : depth of intubation is calculated as follow : length from mouth angle to epiglottis tip plus 12.5cm for male.	Endotracheal intubation time
Comparison Between Conventional Method and Touch and Read Method for Risk Group of Female	Risk group is defined as the patients whose airway length from medial incisor to carina is below 23cm. Conventional method : depth of intubation is 21cm at the medial incisor for female. Touch and read method : depth of intubation is calculated as follow : length from mouth angle to epiglottis tip plus 11.5cm for female.	Endotracheal intubation time
Comparison Between Conventional Method and Touch and Read Method for Normal Group of Female	Normal group is defined as the patients whose airway length from medial incisor to carina is over 23cm. Conventional method : depth of intubation is 21cm at the medial incisor for female. Touch and read method : depth of intubation is calculated as follow : length from mouth angle to epiglottis tip plus 11.5cm for female.	Endotracheal intubation time

Collaborators and Investigators

• Sponsor: The Catholic University of Korea

Study record dates

Study Major Dates

• Study Start: January 1, 2012
• Primary Completion (Actual): July 1, 2012

Study Registration Dates

• First Submitted: June 5, 2014
• First Submitted That Met QC Criteria: June 5, 2014
• First Posted (Estimate): June 6, 2014

Study Record Updates

• Last Update Posted (Estimate): July 22, 2014
• Last Update Submitted That Met QC Criteria: June 23, 2014
• Last Verified: June 1, 2014

More Information

Terms related to this study

• Other Study ID Numbers: DJSMAN-01