Veterinary Dermatology: Pruritus Approach

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Questions and Answers

What is the first step in approaching a clinical case of pruritis?

  • List differential diagnoses
  • Create a treatment plan
  • Determine the prognosis
  • Conduct a thorough history and examination (correct)

Which of the following methods is NOT suggested for refining differential diagnoses?

  • Clinical reasoning
  • Pattern recognition skills
  • Trial treatment evaluation
  • Random guessing (correct)

What diagnostic procedure is appropriate for investigating causes of pruritus?

  • Dietary change
  • Radiology
  • Allergy testing (correct)
  • Surgical intervention

Which of the following factors is NOT relevant in the history taking for a pruritis case?

<p>The pet's favorite food (B)</p> Signup and view all the answers

When developing a treatment plan for pruritis, what is a crucial consideration?

<p>Species-specific treatment protocols (B)</p> Signup and view all the answers

What is essential to include in the problem list for a pruritis case?

<p>Signs of systemic illness (C)</p> Signup and view all the answers

What aspect of pruritis management is emphasized in the clinical approach?

<p>Prevention of recurrence (D)</p> Signup and view all the answers

Which of the following is part of the approach to clinical case management for pruritis?

<p>Considering various diagnostic tests (B)</p> Signup and view all the answers

What does an increase in pruritus indicate in animals?

<p>Clinical signs of discomfort may start to show. (D)</p> Signup and view all the answers

Which of the following is NOT a behavioral manifestation associated with pruritic skin disease?

<p>Weight gain (B)</p> Signup and view all the answers

Which of the following is included in the multidimensional approach to treating pruritic skin disease?

<p>Wound management (A)</p> Signup and view all the answers

In the differential diagnosis of pruritic skin disease, which factor is represented by the letter 'I'?

<p>Infections (B)</p> Signup and view all the answers

How can environmental factors influence pruritus in animals?

<p>They may either lower or raise the pruritic threshold. (D)</p> Signup and view all the answers

What is the recommended treatment for neurogenic causes of pruritus?

<p>Immunotherapy (B)</p> Signup and view all the answers

Which of these treatments is primarily used for addressing infections in pruritic skin disease?

<p>Antibiotics (A)</p> Signup and view all the answers

What role do antiparasitics play in treating pruritic skin disease?

<p>They remove underlying parasite infestations causing pruritus. (A)</p> Signup and view all the answers

Flashcards

Signalment

The initial gathering of information about a patient and their history, including details like age, breed, and any ongoing medical conditions.

General clinical examination

A methodical examination of the animal's body, focusing on physical characteristics and any signs of illness or injury.

Dermatological examination

A detailed assessment of the animal's skin, including its appearance, texture, and any abnormalities.

Differential diagnoses

A list of potential causes for the animal's symptoms, based on the information gathered during the initial assessment.

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Diagnostic procedures

Tests conducted to determine the underlying cause of the pruritus, which could include blood work, skin scrapings, or biopsies.

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Treatment options

Strategies used to address the pruritus, such as medications, therapeutic shampoos, or environmental modifications.

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Approach to pruritic skin disease

The initial steps in the diagnostic and treatment plan.

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Pattern recognition skills

The ability to identify and recognize patterns in the animal's symptoms and history.

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Pruritic Threshold

The point at which an animal starts to show signs of itching due to various triggers like parasites, allergies, or infections.

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Multidimensional Approach to Pruritic Skin Disease

A comprehensive approach to treat itchy skin conditions, taking into account various factors including the underlying cause, medications, environmental management, and client communication.

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Behavioral Manifestations of Pruritic Skin Disease

Irritability, depression, lethargy, restlessness, and aggression can be signs of a pet struggling with itchy skin.

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PAIN mnemonic

A mnemonic device representing the possible causes of itching in animals. P – Parasites, A – Allergies, I – Infection, and N – Neurogenic/Neoplastic.

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Treatments for Pruritic Skin Disease

Treatments for pruritic skin disease can include antiparasitics to kill parasites, antibiotics or antifungals for infections, steroids to reduce inflammation, antihistamines to block histamine release, cyclosporin or oclacitinib to suppress the immune system, immunotherapy to desensitize to allergens, wound management, topical treatments, and environmental management.

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Differential Diagnosis for Pruritic Skin Disease

The process of identifying potential causes for a pet's itchy skin by considering factors like parasites, allergies, infections, and neurological or neoplastic conditions.

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Environmental Management for Pruritic Skin Disease

Medications, environmental changes, and other aspects of animal care can all contribute to the overall approach to managing itchy skin problems.

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Complications of Pruritic Skin Disease

Open wounds, skin infections, and hair loss can all be consequences of prolonged, severe itching in pets.

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Study Notes

Approach to Pruritus

  • Students should be able to identify presentations of pruritic skin disease.
  • Students should be able to create a differential diagnosis list for causes of pruritus.
  • Students should be able to determine appropriate diagnostic procedures for pruritus.
  • Students should be able to determine appropriate treatment options for causes of pruritus.

Current Evidence

  • Skin problems are common in small animal practice.
  • Ectoparasites are a major cause of skin problems in dogs and cats.

Approach to the Clinical Case

  • History of the animal
  • Signalment (breed, sex, age)
  • Physical examination (general, dermatological)
  • Problem list
  • Refine problem list
  • Differential diagnoses
  • Diagnostics
  • Clinical pathology
  • Other tests
  • Trial treatment
  • Allergy testing
  • Diagnosis
  • Prognosis
  • Treatment/Management
  • Prevention
  • Muller and Kirk's Small Animal Dermatology, 7th Edition
  • BSAVA Manual of Canine and Feline Dermatology, 3rd Edition
  • Clinical Reasoning in Small Animal Practice
  • BSAVA Small Animal Formulary

Points to remember for exam questions

  • Define and refine your problem list and use all aspects of investigation for a refined problem list
  • Use pattern recognition (check the first two text books)
  • Use clinical reasoning
  • What systems/systems involved?
  • List your differential diagnoses
  • What clinical management would you undertake in the clinic and after?
  • Prognosis: What further tests would you do, and when?
  • Prescribe appropriate treatments for species involved

Approach to Pruritic Skin Disease - History

  • Any other animals or people affected?
  • How long has the problem been going on?
  • Worsening over time?
  • Medications/how medications have helped in the past ?
  • Ectoparasite treatment history
  • Environmental changes
  • Does the animal scratch, lick etc. which areas?
  • Dietary changes
  • Any changes in diet

Problems/Behavioural manifestations with Pruritic Skin Disease

  • Irritability
  • Depression
  • Lethargy
  • Interrupted behaviours
  • Restlessness
  • Threshold (Pruritus threshold):
    • All patients tolerate varying degrees of pruritus
    • Once threshold is exceeded, clinical signs start
    • Threshold level varies depending on individual patient

Pruritic Visual Analog Scale (PVAS)

  • Tool for quantifying pruritus
  • Scale from 0 to 10
  • 0 – Not Itchy; 10 – Extremely Itchy
  • Score relates to observable behaviours

Approach to Pruritic Skin Disease - Diagnostics

  • History, signalment, and clinical examination
  • Lesion distribution
  • Tape strips, impression smears
  • Cytology, bacteria, yeasts, parasites
  • Skin scrapes
  • Wood's lamp (ringworm identification)
  • Hair examination (self-trauma, fungi)
  • Coat brush (flea dirt)
  • Culture and sensitivity
  • Bacteria/dermatophytes
  • Intradermal skin testing (allergens, hypersensitivities)
  • Serology Test results, allergies, etc
  • Biopsy
  • Treatment Trial

Approach to Pruritic Skin Disease – Parasites

  • Fleas (flea allergy dermatitis)
  • Lice
  • Sarcoptic mange/scabies
  • Demodecosis
  • Cheyletiella infestation
  • Trombicula autumnalis (harvest mites)
  • Otodectes
  • Insect bite hypersensitivity
  • Chorioptes
  • Psoroptes (sheep scab)
  • Ticks
  • Flies
  • Midges (horses)
  • Sweet itch

Approach to Pruritic Skin Disease - Allergies

  • Hypersensitivities
  • Urticaria
  • Contact allergy
  • Food allergies
  • Atopy

Approach to Pruritic Skin Disease - Infection

  • Secondary bacterial infections
  • Pyotraumatic dermatitis
  • Malassezia
  • Ringworm
  • Dermatophilosis
  • Anal sac impaction
  • Skin fold dermatitis
  • Greasy pig disease

Approach to Pruritic Skin Disease - Dermatophytosis

  • Cats – Microsporum canis
  • Dogs – Trichophyton mentagrophytes / M. canis
  • Environmental contamination
  • Circular patches
  • Zoonotic, particularly in children
  • Diagnosis: Woods lamp, scrapings, microscopic analysis
  • Treatment: itraconazole (licensed), malazeb
  • Monitoring and continuous testing & cure for treatment

Approach to Pruritic Skin Disease - Neurogenic/Neoplastic

  • Cutaneous T-cell lymphoma
  • Feline orofacial pain syndrome
  • Acral lick dermatitis
  • Feline psychogenic alopecia
  • Scrapie

Approach to clinical disease: Treatment

  • Multidimensional approach
  • Client communication
  • Therapeutics:
    • Antiparasits
    • Antibiotics/Anti-fungals
    • Steroids
    • Antihistamines
    • Cyclosporin
    • Immunotherapy
  • Wound management
  • Topical treatment
  • Environmental management

Prognosis

  • Control the itch (below a “threshold”?)
  • Control of the environment
  • Curable conditions (e.g., ringworm, parasites)
  • Need for lifelong management (e.g., Atopy, hypersensitivity)

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