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Malignant external otitis: further considerations
Abstract:
Malignant external otitis is an infection which begins in the external auditory canal. It is uniformly caused by the Gram negative Pseudomonas aeruginosa organism and mainly affects elderly diabetics. It spreads to the soft tissues beneath the temporal bone and, if not properly treated leads to facial nerve palsy, mastoiditis, sepsis, osteomyelitis of the base of the skull, sigmoid sinus thrombosis, multiple cranial nerve palsies and death. Experience with 72 patients in varying stages of the disease is summarized. Stressed are the diagnostic criteria of nonresponsiveness to the usual methods of treatment, continued suppuration, and the continuing reformation of granulation tissue in the floor of the external auditory canal. Medical treatment is recommended with hospitalization and intravenous carbenicillin and gentamicin. Minor surgical debridement is helpful. All patients should be treated medically for as long as improvement continues, reserving surgical intervention only in the event a plateau is reached or symptoms and signs become worse under treatment. With or without a major surgical procedure, it is imperative to continue treatment for at least seven days after apparent cure in order to avoid recurrent disease possibly at a site distant from the canal.
Insights
Malignant external otitis, a severe Pseudomonas aeruginosa infection, primarily affects elderly diabetics. Early medical treatment with hospitalization and antibiotics is crucial for managing this condition and preventing severe complications.
Area of Science:
- Infectious Diseases
- Otolaryngology
- Critical Care Medicine
Background:
- Malignant external otitis (MEO) is a serious Gram-negative bacterial infection.
- It originates in the external auditory canal and predominantly affects elderly individuals with diabetes mellitus.
- Untreated MEO can lead to severe complications, including cranial nerve palsies, sepsis, and mortality.
Observation:
- This study summarizes experience with 72 patients at various disease stages.
- Key diagnostic indicators include treatment non-responsiveness, persistent suppuration, and recurrent granulation tissue formation.
- The causative agent is consistently Pseudomonas aeruginosa.
Findings:
- Intravenous carbenicillin and gentamicin, coupled with hospitalization, are recommended medical treatments.
- Minor surgical debridement can be beneficial.
- Medical management should continue as long as improvement is observed, with surgery reserved for treatment plateaus or worsening symptoms.
Implications:
- Prompt and aggressive medical management is vital for MEO patients.
- Extended treatment (at least seven days post-cure) is necessary to prevent disease recurrence.
- Understanding MEO's pathophysiology and treatment nuances is critical for improving patient outcomes.