Prospective Trial to Compare Direct and Indirect Laryngoscopy Using C-MAC PM® with Macintosh Blade and D-Blade® in a...

Area of Science:

• Anesthesiology
• Airway Management
• Medical Device Technology

Background:

• Securing a clear view of the glottis is critical for successful tracheal intubation.
• Difficult airways pose a significant challenge in clinical practice, necessitating advanced tools.
• Evaluating new laryngoscope technologies for improved glottic visualization is essential.

Purpose of the Study:

• To evaluate the C-MAC PM® laryngoscope with a standard Macintosh blade (size 3) versus the D-Blade® in simulated difficult airways.
• To compare direct and indirect laryngoscopy techniques for glottic view assessment.
• To determine the impact of blade geometry and the BURP maneuver on intubation outcomes.

Main Methods:

• Prospective observational study involving 48 adult patients undergoing orthopedic surgery.
• A simulated difficult airway was created using a cervical collar preoperatively.
• Direct and indirect laryngoscopy with Macintosh blade and indirect laryngoscopy with D-Blade® were performed, assessing Cormack-Lehane scores.

Main Results:

• The D-Blade® with C-MAC PM® provided superior glottic views compared to the Macintosh blade in both direct and indirect laryngoscopy.
• Transitioning from Macintosh blade direct laryngoscopy to D-Blade® indirect videolaryngoscopy improved Cormack-Lehane scores from IIb, III, or IV to I or II in 31 patients.
• The C-MAC PM® system, particularly with the D-Blade®, demonstrated enhanced visualization capabilities.

Conclusions:

• The C-MAC PM® laryngoscope combined with the D-Blade® offers a significant advantage in visualizing the glottis in simulated difficult airway scenarios.
• This combination facilitates better assessment and potentially improved intubation success rates compared to conventional Macintosh blade laryngoscopy.
• The study highlights the utility of advanced videolaryngoscopy technology for challenging airway management.