King Vision vs Macintosh Laryngoscopy for Intubation Time in Novice Users

NCT ID: NCT07174050

Last Updated: 2025-09-15

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 70 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2023-01-01
• Study Completion Date: 2024-01-01

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

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: NONE

Study Groups

Group K

Channelled blade of KVVL

Group Type: EXPERIMENTAL

King Vision Channeled Video Laryngoscope

Intervention Type: 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 M

Macintosh laryngoscope

Group Type: ACTIVE_COMPARATOR

Macintosh Laryngoscopy

Intervention Type: 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.

Interventions

King Vision Channeled Video Laryngoscope

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 .

Intervention Type: DEVICE

Macintosh Laryngoscopy

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.

Intervention Type: DEVICE

Eligibility Criteria

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

• Minimum Eligible Age: 18 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Izmir City Hospital

OTHER_GOV

Sponsor Role: collaborator

Hitit University

OTHER

Sponsor Role: lead

Responsible Party

Murat KAYKAC

M.D.

Responsibility Role: PRINCIPAL_INVESTIGATOR

Locations

Izmir City Hospital

Izmir, , Turkey (Türkiye)

Countries

Turkey (Türkiye)

Other Identifiers

2018/5

Identifier Type: OTHER

Identifier Source: secondary_id

KINGVISON1

Identifier Type: -

Identifier Source: org_study_id