Severe odontogenic deep neck space infections: risk factors for difficult airways and ICU admissions

The purpose of this retrospective study was to evaluate perioperative risk factors concerning difficult airway management, primary tracheostomy, and need for intensive care unit (ICU) admission in severe odontogenic space infections.

Perioperative risk factors were retrospectively analyzed in 499 cases. Fisher's exact test and analysis of variance were performed to analyze associations between categorical and continuous variables. Univariate regression analysis was used for estimating predictors for ICU admission. A risk model for ICU admission was performed using multivariate regression analysis. Area-under-the-curve (AUC) was calculated by receiver-operating-characteristic (ROC) curve.

Airway securing in patients with restricted mouth opening led to significant use of the video laryngoscope (p < 0.001) or fiberoptic bronchoscope (p < 0.001). The use of fiberoptic bronchoscopy was significantly increased in patients with dysphagia (p = 0.005) and dyspnea (p = 0.04). Four patients (0.8%) needed primary tracheostomy. ICU admission was significantly associated with higher levels of C-reactive protein (CRP, p = 2.78 × 10^-5), white blood cell count (WBC, p = 0.003), dyspnea (p = 9.95 × 10^-6), and higher body mass index (BMI, p = 0.0003). American Society of Anesthesiologists physical status (ASA PS) class III patients (p = 0.04) and the need for the use of a video laryngoscopy (p = 0.003) or fiberoptic bronchoscopy (p = 6.58 × 10^-5) resulted in a more frequent ICU admission. The AUC of the model was 0.897.

Difficult airway management was mainly dependent on limited mouth opening and elevated CRP. Elevated CRP, BMI, ASA PS III, and dyspnea were important risk factors for ICU admission. These predictors should be considered preoperatively for proper planning and preparation.