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This Concept Map, created with IHMC CmapTools, has information related to: PRURITUS, Atopic allergy is diagnosed by animal's responsiveness to steroids, Environment by Vacuuming, Morphology & distribution where Dogs, PRURITUS What is pruritus? It is the sensation that elicits the desire to scratch. It is one of the most common complaints you will encounter in practice. We can believe the presentation to be pruritus due to observing self-trauma or noting etythema, excoriations, lichenification and alopecia from self-mutilation. PATHOPHYSIOLOGY The sensation of pruritus and pain are carried centrally by nomyelinated slow conducting C fibers and ever along myelinated A delta fibers. The message eventually arrives at the post-central gyrus of the cerebral cortex. Message is then interpreted as the sensation of pruritus. we do not know why scratching aids in relieving an itch however it is postulated that scratching may disturb the amplified, reverberating spinal circuits that perpetuate the sensation of itch. Diffusable chemical mediators induce the sensation to itch. Endogenous mediators that have been implicated include histamine, peptides, proteases, prostaglandins, leukotriens, monohydroxy fatty acids and opioid peptides. Bacterial and fungal endopeptidases also initiate pruritus. A certain pruritic load may be tolerated in an animal without initiating clinical signs. A small increase can provoke clinical signs. At night, when sensory inputs are diminished, you will note a decrease in itching however, "summation of effect" occurs when additive pruritic stimuli from coexistent skin diseases raise an animal above threshold., Drugs using prednisone, Major cause of alopecia in dogs and cats is self-trauma associated with PRURITIS Most forms of alopecia have a significant component of pruritis with associated inflammation. The inflammatory mediators often present within or surrounding the follicle can produce hair loss. PRURITUS, Flea allergy diagnosis by Morphology & distribution, Morphology & distribution where Pruritus with papules and crusts, PRURITUS can be caused by Allergies, PRURITUS What is pruritus? It is the sensation that elicits the desire to scratch. It is one of the most common complaints you will encounter in practice. We can believe the presentation to be pruritus due to observing self-trauma or noting etythema, excoriations, lichenification and alopecia from self-mutilation. PHYSICAL FINDINGS Pay close attention to the skin (obviously), the mucocutaneous junction, oral cavity, ears, genitals and lymph nodes. Chronic flea allergy dermatitis can be noted simply by observing the ware of the incisors and canine teath. YOU CAN HAVE PRURITUS WITHOUT PRIMARY SKIN LESIONS. The primary hair is going to be removed due to the itching. One must note the lichenification, alopecia and excoriation and even pustules as lesions to be sampled from., PRURITUS What is pruritus? It is the sensation that elicits the desire to scratch. It is one of the most common complaints you will encounter in practice. We can believe the presentation to be pruritus due to observing self-trauma or noting etythema, excoriations, lichenification and alopecia from self-mutilation. DIAGNOSIS, Flea control in Environment, Allergies references http://www.macarthurvet.com.au/PetCare/GeneralPetCare/AtopicDermatitis/tabid/24728/Default.aspx#.VBxKyfldWsk The Small Animal Veterinary Nerdbook 3rd Ed. – Sophia Yin, Pg:153-55 Small_Animal_Dermatology: AColour and Therapeutic Guide, 2nd Ed. - Linda Medlaeu, Avoiding allergens by Isolating the animal from house-chores, Flea control in Animal, Avoiding allergens by Keeping the animal indoors, Alopecia Alopecia is the partial or complete lack of hair in areas where it is normally present. Occurs due to the hair being lost from the follicle or lack of hair production. Major cause of alopecia in dogs and cats is self-trauma associated with PRURITIS, Allergies such as Atopic allergy, Allergies such as Flea allergy, Drugs using chlorpheniramine