Factors associated with complications of submental intubation in 339 patients with facial fractures: A German retrospective cohort study.

Purpose: For nearly four decades, submental intubation (SI) has been introduced and employed to avoid tracheostomy in facial trauma cases where nasal/oral intubation is infeasible or associated with possible risks. The purposes of this study were to estimate the frequency and to identify variables associated with complications of SI (CSI).

Methods: The authors organised a retrospective cohort study and enrolled a group of patients with facial trauma and SI during a seven-year interval at two German level one trauma centres where SI has routinely been used in complex facial trauma cases. The predictor variables included demographic, medical, dental, fracture-related, operative, and postoperative parameters. The outcome variable was CSI. We used descriptive, bivariate, and multivariate analyses at the 0.05 significant level.

Results: The sample included 339 patients (24.5% females, 9.4% had complications) with an average age of 58.2 ± 12.0 years (range, 17-89). Bivariate analyses revealed nine significant variables. However, forward stepwise multiple logistic regression modelling identified three variables statistically associated with CSI: smoking (OR, 691.8; 95% CI, 75.9 to 6303.9; P < 0.0001; number needed to harm [NNH], 6), moderate to high gingival inflammation (OR, 786.7; 95% CI, 66 to 9378.9; P = 0.002; NNH, 12), and postoperative use of chlorhexidine mouthwash (OR, 0.03; 95% CI, 0.001 to 0.77; P = 0.0003; number needed to treat [NNT], 2).

Conclusions: smokers and subjects with gingivitis were more likely to experience CSI. Postoperative chlorhexidine rinsing was the potentially modifiable, albeit low-OR, factor. These findings could help to draw an effective guideline against the CSI.