Oxygenation and Lens Preservation Strategies for Tracheal Intubation in the Contaminated Emergency Airway

Abstract

Emergency tracheal intubation is often performed in patients whose airway conditions are unstable before the laryngoscope is inserted. Blood, emesis, secretions, or gastric contents may impair preoxygenation, obscure the laryngeal inlet, contaminate visualization devices, and compress the time available for safe decision-making. This paper examines the clinical and technical problem of contaminated airway intubation, with particular attention to first-pass success, video laryngoscope performance, apneic oxygenation, suction-assisted decontamination, and emerging device concepts that combine optical preservation with oxygen delivery. The central argument is that soiled-airway failure is not only a matter of poor glottic exposure, but also a combined physiological, optical, ergonomic, and procedural problem. Evidence from emergency department, intensive care, operating room, simulation, and prehospital studies suggests that repeated attempts are associated with adverse events, that video laryngoscopy improves several airway outcomes but remains vulnerable to lens obstruction, and that apneic oxygenation may reduce desaturation in selected contexts. Suction-assisted techniques remain necessary, although they do not fully address camera contamination once liquid or particulate material reaches the lens. An integrated approach that treats suction, laryngoscope optics, oxygen insufflation, operator workload, and staged validation as linked design problems may provide a more realistic research pathway than isolated device evaluation. Future studies should avoid assuming that improved visibility alone will translate into better clinical outcomes and should test integrated systems in contamination models, high-fidelity simulation, and carefully monitored patient cohorts.