King Vision vs Macintosh Laryngoscopy for Intubation Time in Novice Users

NCT07174050 | Completed

• 2 other identifiers: KINGVISON12018/5
• Study Type: interventional
• Target: 70
• Locations: 1 country
• Sites: 1

Brief Summary

This study evaluated two different devices used for placing a breathing tube (endotracheal intubation) in adult patients undergoing elective surgery. The aim was to compare the King Vision videolaryngoscope, which has a camera and a guiding channel for the tube, with the traditional Macintosh laryngoscope, which allows doctors to look directly at the vocal cords. The study focused on how long it takes to successfully insert the tube, the need for additional maneuvers during the procedure, and the overall success rate of first attempts. The procedures were performed by novice operators under supervision.

Conditions

Airway Management; Endotracheal Intubation; Tracheal Intubation, Elective Surgery

Outcome Measures

Primary Outcomes (1)

• Time to successful endotracheal intubation (seconds)

  Measured from insertion of the laryngoscope blade between the patient's incisors until removal of the blade after correct placement of the endotracheal tube, confirmed by capnography.

  During intubation (intraoperative period, approximately 1-2 minutes)

Study Arms (2)

Group K

EXPERIMENTAL

Channelled blade of KVVL

Device: King Vision Channeled Video Laryngoscope

Group M

ACTIVE COMPARATOR

Macintosh laryngoscope

Device: Macintosh Laryngoscopy

Interventions

King Vision Channeled Video Laryngoscope DEVICE

King Vision Videolaryngoscope (KVVL) is one of the new indirect laryngoscopes with disposable (either with channeled or non-channeled) blades .Both designs include an anti-fog lens coating . The channelled KVVL has a rigid blade with an integrated channel for introducing the endotracheal tube. The height and width of the standard non-channeled and channeled blades are 13 mm and 26 mm vs 18 mm and 29 mm, respectively. The KVVL has a unique design and high-quality image . It has a camera that enables a clear view of the glottis. It is a solid, portable, battery-operated device with an organic LED display for video laryngoscopy . It allows better glottis visualization and Cormack Lehane score than DL. Compared with Airtraq, the KVVL has wide field of view (160° vs 80° respectively) and potentially shortens the time to tracheal intubation .

Group K

Macintosh Laryngoscopy DEVICE

In clinical practice, direct laryngoscopy (DL) with either a curved (Macintosh) or straight (Miller) blade is a well-known and reliable technique in the hands of an experienced operator.

Group M

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Adult patients (≥18 years old) scheduled for elective surgery under general anesthesia requiring orotracheal intubation
• American Society of Anesthesiologists (ASA) physical status I-II
• Mallampati airway classification I-II
• Written informed consent obtained from the patient

You may not qualify if:

• Predicted or known difficult airway: Mallampati III-IV, inter-incisor distance \<2.5 cm, thyromental distance \<6 cm, limited cervical spine mobility
• History of difficult intubation or need for awake/rapid-sequence intubation
• Upper airway pathology (tumour, trauma, infection), limited mouth opening, or craniofacial anomalies
• Emergency surgery, high aspiration risk, or full stomach
• Severe cardiopulmonary instability (e.g., shock, severe hypoxaemia)
• Pregnancy or breastfeeding
• BMI \>35 kg/m² (if your protocol excludes obesity; remove if not applicable)
• Participation refusal or inability to consent

Sponsors & Collaborators

• Hitit University: lead
• Izmir City Hospital: collaborator

Study Sites (1)

Izmir City Hospital

Izmir, Turkey (Türkiye)

Location

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: M.D.

Study Record Dates

• First Submitted: September 8, 2025
• First Posted: September 15, 2025
• Study Start: January 1, 2023
• Primary Completion: July 31, 2023
• Study Completion: January 1, 2024
• Last Updated: September 15, 2025

Record last verified: 2025-09

Locations

TU (1)