here - Australian College of Veterinary Scientists

More documents

Recommendations

Info

Erythema multiforme Rare, acute, self-limiting, urticarial, maculopapular or vesico-bullous dermatosis. Other triggering influences such as drugs, infections (especially Herpes virus), and tumours - especially lymphoreticular neoplasms. Many cases are classified as idiopathic. Aetiology / Pathophysiology Can be considered a type of allergic response, being very similar to graft versus host reaction. Clinical presentation Lesions tend to have a symmetrical distribution. Asymptomatic cutaneous eruptions. Characteristic 'donut like' skin urticarial lesions develop rapidly from initial urticaria and plaques. Occasionally involves mucous membranes of mouth. Persist from days to weeks. No scaling, crusting or alopecia in many horses. These plaques do not pit on pressure Differential diagnosis Urticaria, amyloidosis, mastocytoma, lymphosarcoma, fixed drug reaction, toxic epidermal necrolysis. Diagnosis Skin biopsy. Management Runs benign course over 2-3 months. Recurrence reported in some cases. Prognosis Guarded to poor for permanent recovery. 46 ACVSC Proceedings Dermatology Chapter Science Week 2005
Introduction: Equine Chronic Urticaria Greg Burton Urticaria (hives) are relatively common in horses. Chronic urticaria is an ill-defined syndrome in the horse whereby transient urticarial eruptions occur in a recurrent fashion over a period of greater than 6 to 8 weeks. Chronic urticaria in people is more clearly defined as urticarial eruptions that occur at least twice weekly for greater than 6 weeks. Pathogenesis: The pathogenesis is poorly understood. Both immunological and nonimmunological mechanisms are considered likely. The major effector cell is likely to be the mast cell however basophils, mononuclear cells, platelets and endothelial cells may also play a role. Increased IgE bearing cells have been identified in skin biopsies of horses with urticaria. Potential triggers - type 1 and type III hypersensitivity reactions (atopy, adverse food reactions, contact reactions, arthropod bites, parasites) - physical triggers (sunlight, pressure, heat, cold and exercise) - psychological stress - drugs (ivermectin, various antibiotics, NSAIDs) - idiopathy Clinical features: There is no reported age, breed or sex predisposition in horses with urticaria. Urticarial lesions appear suddenly, are often generalised and somewhat symmetrical, are associated with variable pruritus and usually not associated with oozing of serum or haemorrhage. They are variable sized from a few millimetres to several centimetres with sharply demarcated edges and flat tops. The lesions are not painful, have normal body temperature and pit on pressure. They are effervescent and resolve within 24 hours. A clinical classification exists and may have some aetiological significance. I. Conventional urticaria: papules and wheals of 2-5mm diameter II. Papular urticaria: uniform 3-6mm papules and often associated with insect bites, especially mosquitoes III. Giant urticaria: up to 40cm diameter ACVSC Proceedings Dermatology Chapter Science Week 2005 47
Page 1 and 2: Australian College of Veterinary Sc
Page 3 and 4: Australian College of Veterinary Sc
Page 5 and 6: 3.00 Afternoon tea 3.30 How I treat
Page 7 and 8: Dr Jennifer A. Charles BVSc MVS Dip
Page 9 and 10: Scientists in Feline Medicine in 19
Page 11 and 12: IgE-bearing cells have been demonst
Page 13 and 14: years, median age 6.5 years, with a
Page 15 and 16: dusts, grain smuts, moulds, danders
Page 17 and 18: References: Evans AG, Paradis MR, &
Page 19 and 20: Comparatively simple, cheap and eff
Page 21 and 22: TABLE 1: CURRENT ALLERGENS SELECTED
Page 23 and 24: AmericanCockroach Cockroach mix
Page 25 and 26: Patient Preparation Drug Withdrawal
Page 27 and 28: Each injection site is visually exa
Page 29 and 30: References 1. Scott DW, Miller WH:
Page 31 and 32: Intradermal Testing (IDT) in Horses
Page 33 and 34: TABLE 2 Additional allergens used i
Page 35 and 36: Allergen Positive reactions Mosquit
Page 37 and 38: much higher and corresponded to the
Page 39 and 40: and this and other uncontrolled tri
Page 41 and 42: Introduction Diagnostic Approach to
Page 43 and 44: Wheals vary in size and shape and q
Page 45: References Evans AG, Paradis MR & O
Page 49 and 50: Acute treatment - Epinephrine 1:100
Page 51 and 52: anecdotal success with use of human
Page 53 and 54: an 80:20 mixture of evening primros
Page 55 and 56: Clinical approach to the horse with
Page 57 and 58: identify plants in a pasture that m
Page 59 and 60: Equine sarcoidosis Sonya Bettenay T
Page 61 and 62: described as a possible feature of
Page 63 and 64: others 2001), isotretinoin(Waldinge
Page 65 and 66: 12. LeGall, F., Loeuillet, L., Dela
Page 67 and 68: Introduction The equine sarcoid: an
Page 69 and 70: Clinical Presentation Small fibrous
Page 71 and 72: Assessment should be made on the fo
Page 73 and 74: (ix)Bone becomes devitalized if inc
Page 75 and 76: and mitomycin C have been used. All
Page 77 and 78: Owen LN & Barnett KC (1983) - Treat
Page 79 and 80: any anatomic location but commonly
Page 81 and 82: epidermis may be histologically nor
Page 83 and 84: References D.C. Knottenbelt, S. Edw
Page 85 and 86: indicated. Each sample for culture
Page 87 and 88: Proper dosage and proper duration a
Page 89 and 90: 2. Affect on the horse and 3. Affec
Page 91 and 92: Affected horses usually scratch and
Page 93 and 94: • Cattle ear tags impregnated wit
Page 95 and 96: How I treat: equine pemphigus folia
Page 97 and 98:
Treatment of pemphigus foliaceus in
Page 99 and 100:
SCOTT, D.W., WALON, D.K., SLATER, M
Page 101 and 102:
Diagnosis History of access of hors
Page 103 and 104:
These vaccines are not manufactured
Page 105 and 106:
References Alfaro AA & Mendoza L (1
Page 107 and 108:
y a variety of fungal metabolites.
Page 109 and 110:
Authors recommendations: 1. Both Im
Page 111 and 112:
chorioptic mange by the author (Lit
Page 113 and 114:
Clinical Disease The clinical resul
Page 115 and 116:
treatment options have been used. P
Page 117 and 118:
Notes ACVSC Proceedings Dermatology
show all

here - Australian College of Veterinary Scientists

Create successful ePaper yourself

Delete template?

Save as template?