Does laryngoscopic view after intubation predict laryngoscopic view before intubation?

Area of Science:

• Anesthesiology
• Airway Management
• Surgical Procedures

Background:

• Direct laryngoscopy is crucial for airway management.
• The modified Cormack-Lehane (MCL) scale assesses laryngeal view quality.
• Endotracheal tube (ET) intubation can potentially alter this view.

Purpose of the Study:

• To evaluate the impact of endotracheal tube placement on the laryngeal view using the modified Cormack-Lehane scale.
• To determine if ET intubation distorts the laryngoscopic view.

Main Methods:

• Observational, single-arm study conducted at University of Calgary teaching hospitals.
• 173 adult patients undergoing elective surgery were analyzed.
• Laryngeal view was assessed using the MCL scale before and after ET intubation.

Main Results:

• The ET tube altered the MCL grade in 58 (33%) of 173 patients.
• A worsened laryngeal view (higher MCL grade) occurred in 30 patients (17.34%).
• An improved laryngeal view (lower MCL grade) occurred in 28 patients (16.18%).

Conclusions:

• Endotracheal tube presence significantly changes the laryngeal view during direct laryngoscopy.
• Postintubation MCL grades may not be reliable predictors of the initial laryngeal view.
• Clinical interpretation of postintubation laryngoscopy requires caution.