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Dermatology (Otitis (The August classification system (Predisposing…
Dermatology
Otitis
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Diagnosis
Complete PE and history - esp, derm history
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Otitis externa in cats : ear mites(50% or more of otitis, adults)
Tx
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Agent selection
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Anti-septic cleaners : betadine, ethanol, isopropyl alcohol, weak acids, CHX, TrisEDTA
Ceruminolytic cleaners : propylene glycol, dioctyl sodium sulfosuccinate(DSS), dioctyl calcium sulfosuccinate, toluene
Medications
Topical medications : antibiotic(AG, neomycin은 이독성 주의), anti-fungal, anti-inflammatory, miticides
Systemics : antibiotics, anti-fungal, anti-inflammatory
Immune-Mediated Skin Dz
Autoimmune skin dz
due to genetics, drugs, UV, chronic skin dz, infections, neoplasia, hormone
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Drugs
Steroids : prednisone, methylprednisolone(oral), dexamethasone, triamcinolone
Cytotoxic agents
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Azathioprine
부작용으로 골수 억압(>90% anemia, lymphopenia)
장기간 치료 시 demodicosis, recurrent bacterial pyoderma or dermatophytosis in 10%
고양이에 사용x(leukopenia, thrombocytopenia)
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Alkylating agents
Chlorambucil
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useful in pemphigus, bullous pemphigoid, SLE, DLE, immune-mediated vasculitis, cold agglutinin dz, lymphocytes/plasma cell malignancies
Cyclophosphamide : 골수 억압, sterile hemorrhagic cystitis(in dogs 30%, usually chronic therapy)
Cyclosporine : gingival hyperplasia, papillomatosis, anorexia, renal toxicity(human)
Anti-inflammatory
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Tetracycline/Niacinamide
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T+N combination : DLE, PE, PF in dogs(25~65% of excellent response)
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Pemphigus complex
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Pemphigus foliaceus
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Dogs
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Clinical features
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Footpads contain pustules or are cracked, crusted, hyperkeratotic.
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Secondary lesions : superficial erosions, crusts, scales, epidermal collarettes, alopecia
Distribution of lesions
initially on face, pinnae, nasal planum
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Cats
병변은 개와 비슷한 양상이나, pustule이 더 일시적
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Dx
DDx : exfoliative superficial pyoderma, pustular dermatophytosis
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DLE
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DDx : mucocutaneous pyoderma, vitiligo, PE or PF, drug rxn, SLE
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Tx
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Protopic(0.03%, 0.1% tacrolimus)
SLE
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Lesions : face, ears, distal limbs, groin, axillae, mucous membranes
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Other signs : polyarthritis, fever, proteinuria(renal failure), oral ulceration, lymphedema, etc.
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Vasculitis : foreign Ag에 대한 type3 과민화 반응. purpura, ulcers, arthritis, myositis 등 나타남.
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