Western Canada Veterinary Dermatology Information Newsletter

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Western Canada Veterinary Dermatology Information Newsletter

  1. 1. Western Canada Veterinary Dermatology Information Newsletter Western Canada Veterinary Dermatology Information Newsletter Volume 1 Issue 4 Fall 2008 Compiled by Kinga Gortel, DVM, MS, Dipl. ACVD and Vincent Defalque, Dr. med.vet., Dipl. ACVD We hope that you enjoyed a great summer! Ours was fun but not as relaxing as one might hope. Vincent moved into a new home and took his parents on a tour of western Canada. I adopted Barley, a lovable but high- maintenance Lab mix. Between moving, family visits, and obedience classes, the summer seemed to fly by. In this issue, we hope to share some websites we visit, our referral information, and an update on house dust mites and storage mites from the Veterinary Dermatology journal. We continue to welcome your referrals at the following practice locations: Vincent Defalque Kinga Gortel Canada West Veterinary Specialists Westbank Animal Care Hospital C.A.R.E. (Calgary Animal Referral & & Critical Care Hospital Emergency) Centre Phone: 604 473 4882 Phone: 250 768 4688 Phone: 403 520 8387 FAX: 604 473 4898 FAX: 250 768 9731 FAX: 403 692 4350 1988 Kootenay Street 2429 Drought Road 7140 12th Street SE Vancouver BC V5M 4Y3 Westbank BC V4T 1P7 Calgary AB T2H 2Y4 www.accg.com www.westbankanimalcare.vetsuite.com www.carecentre.ca
  2. 2. Western Canada Veterinary Dermatology Information Newsletter WEB S I T E S W E L I K E ... www.carecentre.ca You will find archived (color!) copies of this newsletter by clicking on Veterinary Community → News → West- ern Canada Veterinary Dermatology Information Newsletter. No need to search for those lost back issues... www.acvd.org The newly updated website of the American College of Veterinary Dermatology features a handy Find a Derma- tologist link. Snowbird clients can locate a dermatologist before heading south. www.vetmed.wsu.edu/depts-vcpl The WSU Veterinary Clinical Pharmacology website features great information about the MDR1 mutation, which imparts drug sensitivity to dogs (e.g. ivermectin). Information about affected breeds (approximately 3/4 of US Col- lies have a mutant gene), testing, and drugs to be avoided in affected dogs. www.greerlabs.com Can’t tell pigweed from plantain? Greer’s Botanical Information Sheets feature photos and descriptions of common allergenic plants. www.heska.com/allercept/client_info.asp Printable client PDFs pertaining to the control of house dust mites, storage mites, molds, and other common al- lergens. www.grassmere-animal-hospital.com/greyhounds.htm These folks know their greyhounds. Bald thighs? Sloughing nails? Footpad corns? An excellent resource for the unique “Greyhound things” affecting the skin, and a guide to how a Greyhound’s labwork is different. www.histiocytosis.ucdavis.edu A comprehensive, vet- and client-friendly site by the authority in the confusing world of histiocytic diseases, Dr. Peter Moore. www.vin.com How did we ever find information before VIN? How long does my itchy patient have to stop medications before a dermatology referral? One of the most common questions referring veterinarians ask is “How long does my patient have to be off medi- cations before seeing you?” The simple answer is: not at all. We can arrange for any appropriate withdrawal times, if needed, at the time of the consultation. Allergy testing can then be scheduled at the most appropriate time of year for the pet. In steroid-dependent patients, we can try to manage pruritus with antimicrobials, bathing, cyclosporine, and other means that do not interfere with allergy testing. It is not necessary to stop steroids or anti- histamines in patients who do poorly without them. Withdrawal of bathing IS very useful - at least 5 days before the appointment to allow us to identify primary lesions, and to collect representative cytology samples. Drug Withdrawal Times for Intradermal Allergy Testing Oral steroids: 1 month Topical steroids: 1 month preferred, minimum 10 days Injectable long acting steroids: 6 weeks to 3 months Antihistamines: 10 days Fatty acid supplements: prefer 10 days Other: Cyclosporine (Atopica): no withdrawal required Acepromazine: interferes with testing so not recommended as a sedative for travel These withdrawal times can also be found on Vincent’s handout at: www.accg.com//sites/accg/files/Dermatology/YourPetandSkinTesting.pdf
  3. 3. Western Canada Veterinary Dermatology Information Newsletter quantities to cause symptoms, or are they simply cross-reacting with the more ubiquitous house dust mites? Several recent studies have added to what we known about these mysterious mites. Saridomichelakis et al’s Assessment of cross- reactivity among five species of house dust and storage mites in the April 2008 Vet. Derm. showed extensive co-sensitization to house dust and storage mites. Both naturally atopic dogs, and dogs experimen- tally sensitized to D. farinae showed ≥50% co- sensitization the various species of mites studied. Another recent (Vet. Derm. August 2008) paper, Evaluation of storage mite contamination of com- mercial dry dog food by Brazis et al assessed 10 dif- ferent dry premium dog food bags in Europe. Prior MORE THAN YOU EVER WANTED studies in Germany and the northern US had failed to TO KNOW ABOUT HOUSE DUST show storage mite contamination in dog food. This study showed a different story. It was the first report to MITES AND STORAGE MITES demonstrate that low numbers of storage mites could be found in some unopened bags of food. When the Allergy testing in human and veterinary patients has dog food bags were stored open for 6 weeks in a labo- traditionally included the two house dust mites, Der- ratory setting, no contamination was seen. However, matophagoides pteronyssinus and Dermatophagoides almost all bags stored in a kennel setting became con- farinae. More recently, many serum and skin allergy taminated by 3 to 5 weeks. The most common culprit tests have included the prehistoric-sounding storage was the mould storage mite, Tyrophagus spp. Interest- mites: Tyrophagus putrescensiae, Acarus siro, and/or ingly, the one bag with an airtight closure did not show Lepidoglyphus destructor. What are these mites and contamination. This study suggests that dry dog food why are they important? may represent a relevant source of storage mite expo- sure, but further investigation is needed to assess dog House dust mites are ubiquitous and found at highest foods in household settings. concentrations in bedding, carpets, sofas, and pet beds. They feed on human and animal dander and Recommendations for controlling house dust mites in produce large amounts of allergenic feces. Storage the home environment are easily found, and we rec- mites (sometimes also called forage mites) live on ommend checking Heska’s website listed on the previ- various food sources, most notably on dry grains, ous page. It is more difficult to assess whether control stored dry foods, and mould. measures for storage mites are necessary, but in dogs who react to storage mite allergens, consideration The two species of house dust mites are important and should be given to the following: very common sources of allergens responsible for the sensitization of dogs with atopic dermatitis. Approxi- • store food in airtight container in a dry area mately 50-60% of dogs reacting on allergy testing • if possible, freeze dry food and thaw enough for 1-2 show positive reactions to these mites. Positive serum days at a time or skin allergy test reactions to storage mites are also • buy small bags of dog food, do not stockpile large common, and in our experience, often found in asso- amounts ciation with house dust mite reactions. What remains • never use outdated food poorly understood is the true role of the storage mites • consider a trial period (1-2 months) of feeding only in a clinical setting. In humans, they are a cause of al- canned food or a grain-free home cooked diet lergic symptoms due to occupational exposure in • check for and remove any mould in the home farms, grain stores, and bakeries, and can cause se- • wash food containers in hot water vere allergic reactions after ingestion of contaminated • do not store dog food with other dry foods, fruit, or foods. Less is known in allergic pets. Are these mites vegetables truly present in the patient’s environment in sufficient • use the same precautions for treats and supplements
  4. 4. Western Canada Veterinary Dermatology Information Newsletter Calendar of dermatology events Okanagan Veterinary Medical Association: Tuesday October 28, 2008 Kelowna, BC Mistakes and Misconceptions in Veterinary Dermatology - 2 hr - Kinga Gortel Canada West Veterinary Specialists and Novartis Animal Health: Thursday October 23, 2008 Vancouver, BC The Use of Cyclosporine for the Treatment of Atopic Dermatitis - 1.5 hr - Vincent Defalque George F. Muller Veterinary Dermatology Seminar: October 29-November 5, 2008 Big Island, Hawaii www.vetmed.ucdavis.edu/CE/mullerderm.html The theme of this year's program is "Voting for Success: Electing the Best Candidates for Therapy!" Best available therapy will be emphasized along with the latest information on many skin diseases seen commonly in general and referral practice. 6th World Congress of Veterinary Dermatology: November 19-22, 2008 Hong Kong www.vetdermhongkong.com This amazing meeting takes place in a different part of the world every 4 years and features content from various international experts. Sampling the local culture is a highlight of the World Congress. Nestle Purina Petcare: Sunday March 1, 2009 Saanich, BC Food Allergy in Dogs and Cats - 1.25 hr - Vincent Defalque Calgary Academy of Veterinary Medicine: March 11, 2009 Calgary, Alberta Mistakes and Misconceptions in Veterinary Dermatology - 2 hr - Kinga Gortel North American Veterinary Dermatology Forum: April 15-18, 2009 Savannah, Georgia www.navdf.org The annual meeting of the American College of Veterinary Dermatology and the American and Canadian Academies of Veterinary Dermatology. This well-attended meeting provides specialists and practitioners with an interest in dermatology with a wealth of information. Sci- entific sessions are presented alongside practical concurrent sessions. Veterinary Dermatology Information Newsletter c/o Dr.Vincent Defalque Canada West Veterinary Specialists 1988 Kootenay Street Vancouver, BC V5M 4Y3

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