Probability Distribution of Times for Selective Lobar Intubation and Ventilation Using a Novel Subglottic Airway...

Area of Science:

• Critical Care Medicine
• Pulmonary Medicine
• Medical Simulation

Background:

• Acute respiratory distress syndrome (ARDS) presents significant lung heterogeneity, risking ventilator-induced lung injury.
• Selective lobar ventilation offers a targeted approach to manage lung heterogeneity by isolating specific regions.
• The clinical feasibility and time requirements for selective lobar intubation remain unestablished.

Purpose of the Study:

• To evaluate the time required for selective lobar intubation and ventilation using a novel airway device.
• To test the hypothesis that procedural times follow a log-normal probability distribution.
• To assess the probability of the procedure exceeding a five-minute threshold.

Main Methods:

• Prospective observational study in a high-fidelity mannequin simulation center.
• Clinicians performed selective endobronchial intubation of the left lower lobe using a 'tube-thru-tube' technique with video laryngoscopy and fiberoptic bronchoscopy.
• Procedural times were analyzed for fit to log-normal and other probability distributions.

Main Results:

• Among experienced clinicians (n=46), procedural times strongly fit a log-normal distribution (P=0.73).
• The mean time for successful selective lobar intubation was 2.26 minutes.
• The 95% upper confidence limit for exceeding five minutes was 0.02%, indicating high safety.

Conclusions:

• Procedure times for selective lobar ventilation demonstrate statistical predictability via a log-normal distribution.
• This predictability is vital for evaluating safety and designing clinical trials for ARDS therapies.
• The findings support the application of log-normal distribution analysis for advanced airway tasks.