Infrahyoid involvement may be a high-risk factor in the management of non-odontogenic deep neck infection: Retrospective study.

OBJECTIVES: This study sought to investigate the impact of involvement of the infrahyoid neck space on the management of non-odontogenic DNI.

METHOD: Eighty-one patients treated for non-odontogenic DNI over 5 years were retrospectively recruited into this study. Demographics, etiology, radiology results, treatments, duration/cost of hospital stay, and complications were recorded. Differences between DNIs with and without infrahyoid involvement, as defined based on an anatomical chart, were analyzed.

RESULTS: Sixty-two male and 19 female patients with a median age of 46.22 years were included. Fifteen patients had cellulitis, and 66 patients had abscesses. Streptococcus was the most commonly observed bacterium. Compared with DNIs only in suprahyoid spaces (n = 60, 74.07%), DNIs with infrahyoid space involvement (n = 21, 25.93%) were associated with higher incidences of the involvement of ≥3 spaces (85.71%, P = 0.000), mediastinitis (38.10%, P = 0.000), tracheostomy (28.57%, P = 0.008), surgery using a transcervical approach (66.67%, P = 0.000), and intensive care unit therapy (19.05%, P = 0.004), as well as longer hospital stays (16 days, P = 0.000) and higher costs ($2872, P = 0.000).

CONCLUSION: Infrahyoid involvement should be regarded as a high-risk factor in the management of deep neck infection (DNI). A relatively aggressive plan that includes transcervical surgery and tracheostomy should be considered at earlier stages for DNI with infrahyoid involvement.