Objectives To summarise current practices in the diagnosis and management of Deep Neck Space Infections (DNSIs) To inform future studies in developing a framework in the management of DNSIs Design This review was registered on PROSPERO (CRD42021226449) and reported in line with PRISMA guidelines. All studies from 2000 that reported the investigation or management of DNSI were included. The search was limited to English language only. Databases searched included AMED, Embase, Medline and HMIC. Quantitative analysis was undertaken with descriptive statistics and frequency synthesis with 2 independent reviewers. A qualitative narrative synthesis was conducted using a thematic analysis approach. Setting Secondary or Tertiary Care centres that undertook management of Deep Neck Space Infections. Participants All adult patients with a deep neck space infection. Main outcome measures The role of imaging, radiologically guided aspiration and surgical drainage in DNSIs. Results 60 studies were reviewed. 31 studies reported on imaging modality, 51 studies reported treatment modality. Aside from a single RCT all other studies were observational (n=25) or case series (n=36). CT was used to diagnose DNSI in 78% of patients, Mean percentage of management with open surgical drainage was 81% and 29.4% for radiologically guided aspiration. Qualitative analysis identified 7 major themes were identified on DNSI. Conclusion There are limited methodologically rigorous studies investigating DNSIs. CT imaging was the most used imaging modality. Surgical drainage was commonest treatment choice. Areas of further research on epidemiology, reporting guidelines and management are required.

Key Points • Sepsis is associated with high morbidity and mortality and is a known complication of infections of the head and neck. Screening for sepsis should be conducted on admission in order to identify patients at risk and provide early intervention. • Our audit on an ENT ward in a district general hospital found that sepsis screening is poor, however this can be improved further by education and visual reminders such as poster or a clerking proforma. • The most common head and neck infections admitted to a district general hospital were tonsillitis, peritonsillar cellulitis and peritonsillar abscesses. • The incidence of sepsis as a complication of head and neck infections is very rare if diagnosed according to the updated qSOFA criteria. • Using SIRS criteria may result in falsely high rates of diagnosis of sepsis and may lead to excessive and inappropriate clinical management in patients who could otherwise be managed less aggressively.