Damage occurs during direct laryngoscopy?

JIPMER Nursing Officer - 2020

Medical & Surgical Nursing

Easy

Appeared in: JIPMER Nursing Officer - 2020

Explanation

Damage to the maxillary incisors is the most common iatrogenic complication of direct laryngoscopy and tracheal intubation.
The injury typically results from an incorrect technique where the operator uses the upper teeth as a fulcrum or pivot point for the laryngoscope blade.
The correct technique involves lifting the laryngoscope handle forward and upward ('up and away') to expose the glottis, without rocking back on the teeth.
The maxillary incisors are most vulnerable due to their anterior position and direct exposure to the pressure from the laryngoscope blade if used improperly.

Option A: While lacerations to the gums (gingiva) and lips can occur, they are generally considered less severe and are reported less frequently than dental trauma.
Option B: The laryngoscope blade is placed on the tongue to displace it and the mandible anteriorly; it does not typically make contact with or exert force on the mandibular (lower) molars.
Option D: Injury to the arytenoid cartilages, such as dislocation or subluxation, is a known but rare complication of endotracheal intubation, occurring much less frequently than dental trauma.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Complications of Direct Laryngoscopy as background academic context rather than a clinical decision trigger.
A crucial pre-procedure nursing and anesthesia assessment involves checking for loose teeth, dental crowns, bridges, or veneers. This identifies patients at higher risk for dental damage.
A dislodged tooth or dental hardware can be aspirated into the airway, creating a foreign body obstruction, which is a life-threatening emergency requiring immediate intervention.
Documenting the pre-procedure dental assessment is essential for patient safety and medicolegal purposes.

How to Approach the Question

Identify the core of the question, which asks for a common type of damage during a specific procedure: direct laryngoscopy.
Visualize or recall the steps of the procedure. A laryngoscope is a rigid instrument inserted into the mouth to provide a view of the vocal cords for intubation.
Consider the anatomical structures the instrument interacts with: tongue, teeth, epiglottis, and laryngeal structures.
Analyze the mechanics of the procedure. A common error is to use the instrument as a lever. The most natural pivot point for this incorrect action would be the upper front teeth.
Evaluate the options based on this mechanical understanding. Damage to maxillary incisors is highly plausible from using them as a fulcrum. Damage to lower molars is unlikely as the blade is on the tongue. Damage to deeper structures like the arytenoids is possible but requires a different type of error (e.g., advancing the blade too far) and is known to be less common.
Conclude that dental trauma, specifically to the maxillary incisors, is the most frequent and direct complication resulting from common technical errors during laryngoscopy.

Concept Tested & Keywords

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E6 Anatomy Applied Ashalatha 4e p. 96-98

E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 350-352