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Infections of the External Ear Bastaninejad Shahin, MD, Otolaryngologist Prof. Cummings
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Otitis Externa Bacterial infection of external auditory canal Categorized by time course –Acute –Chronic
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Acute Otitis Externa (AOE) Swimmer’s ear Preinflammatory stage: first stage starts with: –Symptoms: pruritus and sense of fullness –Signs: mild edema
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AOE: Mild to Moderate Stage Progressive infection Symptoms –Pain –Increased pruritus Signs –Erythema –Increasing edema –Canal debris, discharge
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AOE: Severe Stage Severe pain, worse with ear movement Signs –Lumen obliteration –Purulent otorrhea –Involvement of periauricular soft tissue
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AOE: Treatment Most common pathogens: P. aeruginosa and S. aureus Four principles –Frequent canal cleaning –Topical antibiotics –Pain control –Instructions for prevention
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Chronic Otitis Externa (COE) It’s a chronic inflammatory process Persistent symptoms (> 2 months) Bacterial, fungal, dermatological etiologies
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COE: Symptoms Unrelenting pruritus Mild discomfort Dryness of canal skin
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COE: Signs Dry, flaky skin
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COE: Treatment Similar to that of AOE Topical antibiotics, frequent cleanings Topical Steroids Surgical intervention
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Furunculosis Acute localized infection Lateral 1/3 canal Obstructed apopilosebaceous unit S. aureusPathogen: S. aureus
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Furunculosis Symptoms: pain and diminished hearing level Signs: –Edema –Erythema –Tenderness –Occasional fluctuance
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Furunculosis: Treatment Local heat Analgesics Oral anti-staphylococcal antibiotics Incision and drainage reserved for localized abscess IV antibiotics for soft tissue extension
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Otomycosis Fungal infection of EAC skin Primary or secondary Most common organisms: Aspergillus and Candida
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Otomycosis: Symptoms Often indistinguishable from bacterial OE Pruritus deep within the ear Dull pain Hearing loss (obstructive)
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Otomycosis: Signs Canal erythema MildMild edema White, gray or black fungal debris (wet newspaper)
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Otomycosis
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Otomycosis: Treatment Thorough cleaning and drying of canal Topical antifungals Canal Acidification Treat coexisted bacterial superinfection
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Granular Myringitis (GM) Localized chronic inflammation of pars tensa with granulation tissue Sequela of primary acute myringitis, previous OE, perforation of TM Common organisms: Pseudomonas, Proteus
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GM: Symptoms Foul smelling discharge from one ear Often asymptomatic Slight irritation or fullness No hearing loss or significant pain
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GM: Signs TM obscured by pus Granulations No TM perforations
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GM: Treatment Careful and frequent debridement Topical anti-pseudomonal antibiotics Occasionally combined with steroids At least 2 weeks of therapy May warrant careful destruction of granulation tissue if no response
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Bullous Myringitis Due to the Virus or Mycoplasma Confined to tympanic membrane Primarily involves younger children
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Bullous Myringitis: Symptoms Sudden onset of severe pain No fever No hearing impairment Bloody otorrhea (significant) if rupture
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Bullous Myringitis: Signs Inflammation limited to TM & nearby canal Multiple reddened, inflamed blebs Hemorrhagic vesicles
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Bullous Myringitis: Treatment Self-limiting Analgesics Topical antibiotics to prevent secondary infection Incision of blebs is unnecessary Azithromycin or AOM antimicrobial therapy
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Necrotizing External Otitis(NEO) Potentially lethal infection of EAC and surrounding structures Typically seen in diabetics and immunocompromised patients Pseudomonas aeruginosa is the usual culprit
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NEO: Symptoms Poorly controlled diabetic with OE Deep-seated aural pain Chronic otorrhea Aural fullness
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NEO: Signs Inflammation and granulation Purulent secretions Occluded canal and obscured TM Cranial nerve involvement
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NEO: Imaging Plain films Computerized tomography – most used Technetium-99 – reveals osteomyelitis Gallium scan – useful for evaluating RxGallium scan – useful for evaluating Rx Magnetic Resonance Imaging
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NEO: Diagnosis Clinical findings Laboratory evidence Imaging Physician’s suspicion
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NEO: Treatment Intravenous antibiotics for at least 4 weeks (Ceftazidim) – with serial gallium scans monthly Local canal debridement until healed Pain control Use of topical agents Surgical debridement for refractory cases
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NEO: Mortality Death rate essentially unchanged despite newer antibiotics (37% to 23%) Higher with multiple cranial neuropathies (60%)
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Herpes Zoster Oticus Viral infection caused by varicella zoster Infection along one or more cranial nerve dermatomes (shingles) Ramsey Hunt syndrome: herpes zoster of the pinna with otalgia and facial paralysis
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Herpes Zoster Oticus: Symptoms Early: burning pain in one ear, headache, malaise and fever Late (3 to 7 days): vesicles, facial paralysis
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Herpes Zoster Oticus: Treatment Oral steroid taper (10 to 14 days) Antivirals
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