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Completed

NCT Number: NCT07174050

King Vision vs Macintosh Laryngoscopy for Intubation Time in Novice Users

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.

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Key information

Conditions

Airway Management Endotracheal Intubation Tracheal Intubation, Elective Surgery

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Izmir City Hospital

Izmir, Turkey (Türkiye)

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • 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

Exclusion criteria

  • 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

Treatment and study plan

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 .

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.

Primary outcomes

  1. Time to successful endotracheal intubation (seconds)

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

    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.

Sponsors and collaborators

Lead sponsor

Hitit University

Other

Collaborators

  • Izmir City Hospital

Registry information

Official study title

Comparison of the King Vision Channeled Videolaryngoscope and Conventional Laryngoscopy for Endotracheal Intubation Time in Novice Users: A Prospective, Randomised Controlled Trial

Acronym: KVVL

Important dates

Study start
2023
Primary completion
2023
Study completion
2024
First posted
Sep 15, 2025
Registry last updated
Sep 15, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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