Abstract
Introduction: Necrotising otitis externa (NOE) is a severe infection of
the external auditory canal and the incidence in the UK has risen
dramatically in recent years. Treatment options for NOE remain
contentious and can confer substantial risks. Osteomyelitis at other
anatomical sites has shown promising outcomes when treated with early
debridement and short-course antimicrobial therapy. Application of this
paradigm in NOE may offer distinct advantages for patients but this
remains to be demonstrated. Methods: A prospective cohort analysis of
patients with NOE admitted to Sunderland Royal Hospital between
January-September 2019. Previous treatment, examination findings,
medical history, relevant microbiology and imaging results were
document. Results: A total of eight patients were included (age 58-87,
male:female 6:2). Most (6/8) patients had type 2 diabetes; 5/6 had poor
glycaemic controls (HbA1c > 48mmol/mol). 4/8 patients had
undergone previous ear syringing. Pain was present on average for 40
days prior to admission (range 14-60 days). Otoscopy and CT findings
were highly variable between cases. Most (5/8) patients grew P.
aeruginosa on bacterial swabs. 5/8 patients were treated with short
course antimicrobial therapy (3/8 prolonged). 5/8 received early
surgical debridement. 7/8 patients were successfully treated – 1
patient died of concurrent haematological malignancy. Conclusion: A
standardised protocol for NOE has facilitated a consistent approach to
treatment at our centre. Selected cases have good outcomes with short
course antimicrobial therapy and early surgical debridement, but this
analysis was not powered to determine statistical significance. A
randomised trial with more patients would confirm non-inferiority of
short course antimicrobial therapy and early surgical debridement in
NOE.