Clinical Approach to Pruritus Flashcards
what triggers acute itch in the brain?
histaminergic nerves
what triggers chronic itch in the brain?
non-histaminergic nerves
how does pain affect itch?
inhibits itch
what infectious diseases cause pruritus in equines?
dermatophytosis
bacterial folliculitis
dermatophytosis
coital exanthema
what makes pruritus chronic?
> 6 weeks
what triggers chronic itch in the brain?
non-histaminergic nerves
what do subcutaneous diseases usually induce?
pain
not itch
what is pruritic threshold?
particular individual able to withstand a certain level of pruritus without scratching
are pruritic stimuli additive?
usually
what happens with time with pruritus?
lichenification
hyperpigmentation
what are the clinical manifestations of itch?
rubbing
licking, chewing, nibbling
scratching
weight loss, sleep disturbances, lethargy, decreased appetite, decreased performance
what is the order of rule-outs for an itchy dog?
rule out/treat ectoparasites
rule out/treat secondary infections
allergies: food trial if nonseasonal
what parasitic diseases can cause pruritus in equines?
culicoides
stomoxys- haematobia
chorioptes
lice
oxyuriasis
what can cause facial pruritus in equines?
atopic dermatitis
food allergy
black flies
what are the cutaneous reaction patterns in the allergic horse?
symmetrical pruritus
urticaria
sterile esoinophilic folliculitis
eosinophilic granuloma
combination
