The risk factors for difficult airway or failed airway: a prospective cohort study Airway management is always the first priority and time-treasures in critical ill-patients. Improper management

of difficult airway or resultant fail airway would bring poor prognosis to patients. We investigated the risk factors of difficult or fail airway from the multiple dimension of factors including patients, healthcare and airway devices. We enrolled 252 intubated patients, including 37 trauma patients, 55 patients (22%) with difficult airway, and 22 patients (8.7%) with fail airway. In analysis of risk factors of difficult airway, factors including obesity, short neck or thickness of soft tissue, facial deformities and oral-nasal bleeding have positive association with fail airway, but the seniority of healthcare providers had no effect. However, experienced healthcare providers have more success rate after the occurrence of fail airway. The most complications of fail airway include airway trauma and hypoxia. As compared with non-trauma patients, trauma patients have more episodes of fail airway, difficult airway, and use of RSI, rescue airway for fail airway, airway trauma and vomiting. Therefore, it is necessary to establish an easy and safe standard guideline in daily practice of difficult and urgent airway management for healthcare providers.