Dermatology - Diagnostic Approach and Procedures Flashcards Preview

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Flashcards in Dermatology - Diagnostic Approach and Procedures Deck (34)
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What are the top three dermatology-related problems?

otitis externa, allergies, and pyoderma


What are the key diagnostic tools that should be used to facilitate management of skin problems?

skin scrapings, impression smears of yeast, trichogram, and cytology of appropriate lesions


Dermatology problems are frequently __________. That is, there is often an _______ problem (such as an allergy) that is compounded by secondary problems or factors (such as _____).

multifaceted; underlying; infection


What is the 'key' to diagnosing and treating all dermatological issues?

First, identifying all factors involved and then controlling all secondary issues


After secondary infections are controlled, what is a necessary next step?

a recheck examination


What are the steps to a dermatology case workup?

Step 1: The Initial Visit
Step 2: The Dermatology Data Base
Step 3: Manage Perpetuating Factors
Step 4: The Recheck Examination
Step 5: Identify the Primary Factors


What information is important to get during the initial visit of a patient with dermatological issues? (Non-specific)

signalment, history, and physical examination


True or False: Data base tests are only performed when there is evidence of damage to the epidermis.

False - they should be performed in every case at every visit


What should happen during a dermatology recheck examination?

1. Evaluation of your previous therapy for perpetuating factors revealed at first visit
2. Re-visitation of the dermatologic history
3. Repeat the data base - because things change!


When taking a history for a dermatology case, what information should you make sure to get?

The past medical history, the environmental history, the dietary history, and the history of the present problem


With what type of dermatologic disease should skin scraping techniques be used on?

all types - it should be done on all animals with dermatologic disease


What materials are needed for a skin scrape?

#10 scalpel blade (dull is better), mineral oil, glass slides, clippers, and a microscope


How do you perform a skin scrape?

First, clear the area from hair. Then, squeeze the area gently and release. Place mineral oil on the glass slide. Wipe the blade in oil, scrape the surface of the skin, and hold the plade perpendicular to the skin surface. The area should be 1.5x1.5 cm. Finally transfer to a slide and examine under 10x.


Which mites are easily recovered in skin scraping?

Demodex canis


Which mites are difficult to find in skin scrapings?

Sarcoptes, D. gatoi, and D. injai


When are smears for Malassezia performed?

Whenever yeast are suspected as a primary or secondary cause of pruritis, scaling, erythema, or seborrhea


What materials are needed for an impression smear?

glass sides, scotch tape, clippers, cotton swab, microscope slide, microscope, and appropriate stains


True or False: There should no hair in the area that an impression smear is going to take place.



True or False: You should always heat fix an impression smear in order to get a diagnosis.

False - you do not always need to heat fix it. It is possible to get a diagnosis without heat fixing it, there are just less organisms. You can also ‘cook’ your cells by overheating and ruin your sample. If you use a hairdryer to dry, make sure to use cool air to avoid overheating.


When doing impression smears, where are cotton-tipped applicator swabs useful?

In hard to reach places such as skin fold areas and the ear canal


How do you transfer a cotton-tipped applicator sample to a slide?

roll pressing firmly - do not rub


How can you use regular glass microscope slides to take an impression smear?

press it directly and firmly against the skin several times - make sure to wear gloves


What is the best objective to view Malassezia on?

40x - then the oil objective if needed


What is a trichogram used for?

to evaluate the integrity of hair shafts and also serves as a test for demodicosis and dermatophytosis


What materials are needed for trichograms?

forceps, mineral oil, glass slides, cover slips, and a microscope


How are trichograms performed?

Mosquito forceps are used to firmly grasp several hairs and then pull them from the follicle. The hair samples should be placed in a drop of mineral oil, all in the same direction, on a microscope slide and then covered with a cover slip. They are to be examined immediately


What are hair follicles in trichograms examined for?

Type of hair, structural damage to hairs supporting the presence of pruritus or other abnormalities, evidence of dermatophytosis, ectoparasites, the stage of hair growth, and pigmentary abnormalities


Where should hair samples for trichograms be collected from?

all over the body


When should fungal cultures be done?

In all dermatology cases


What materials are needed for fungal cultures?

forceps, culture media, glass slides, stains, cover slips, and a microscope

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