SA derm Flashcards Preview

VSCI300 MOD > SA derm > Flashcards

Flashcards in SA derm Deck (110)
Loading flashcards...
1

when looking for parasites down the LM what does the iris diaphragm do?

alter the appearance. if closed - more dark and 'contrasty' if open paler

2

name the 2 cat flea identifiable combs

genal comb - on head/'nose'
pronotal comb - 1st thoracic segment

3

name 2 lice of the dog (one biting, one chewing) and a cat louse

dog
- biting = trichodectes canis
- chewing - linognathus setosus

cat
- biting = felicola subrostratus

4

how many legs do fleas and lice have

6

5

how many legs do mites have. which mite only has 6?

8
trombicula

6

which mites have long legs

surface dwellers (otodectes, cheyletiella, trombicula)

7

what do most mite eggs look like, except demodex canis

oval
d. canis = lemon

8

what is characterisitic about louse eggs

attached to hairs + operculum

9

what 4 tests are used for ectoparasite finding

collect the scale - flea comb, tape, light scrape
direct smear
skin scrape
hair pluck

10

what might you find on scale exaination

felicola subrostrata
trichodectes canis
linognathus spp
cheyletiella
lice eggs

11

what ectoparasites might you see on a smear

otodectes (if in the ear..)
or demodex from any ruptured pustule

12

what mite are you looking for with a trichogram

demodex

13

what else can a trichogram show you

what stage hair is at
- anagen (growing), fat bulb
- telogen (resting) - tapered bulb

14

why is liquid paraffin used for mite, lice, etc prep and collection

mites stay alive
tolerated on skin

15

why would KOH be used instead of paraffin

to visualise better, but kills mites

16

desc how to do both a superficial scrap and a deep one

superficial - from lesions no oozing. put paraffin/KOH on skin, scrape and more oil/KOH on slide

deep - squeeze skin and add oil/KOH, +++ scrapes from new lesions, until capillary ooze

17

are sarcoptes ELISA results reliable

not really. false -ves early in dz and false + in atopic dogs

18

name 4 cytology tests

tape
cotton smear
impression smear
FNA

19

when should you culture a sample

if you see rods
degenerative PMNs
of dont find any bacteria
recurring in fection
all deep infections

20

culture samples are swabs and biopsies. what areas are they each best at getting samples from

swabs - intact lesions, ears, sinus

biopsy - deep inf, acral lick, discharging lesions

21

what does wood's lambs and DTM test for

dermatophytes

22

what are the pros/cons with dermatophyte culture

dont ID spp
contami/infection
cheap, easy, reliable

23

what are the different biopsy tech

punch
tru cut
wedge
sx

24

what conditions do WHWT commonly suffer fro

atopic derm
malassezia derm
demodecosis
ichthyosis

25

why do sertoli cell tumours cause alopecia

oestrogenising effects/lack of testosterone

26

why would color of dog skin matter with SCC

often UV-induced --> depig skin, white coat or alopecic areas +++

sponaneous forms are oral or ungual

27

what is a good way of assessing 'itchiness' from owners

visual analogue score - 1--> 10. as in 1 - never
10 - keeps you up at nght, dog not sleeping

28

describing skin lesions, you need what elements

- distrubution (focal)
- description - 1ry or 2ry lesion (alopecia)
- location (cd-d rump)
- evolution (eg papules --> crusts)

29

how can you assess whether cutaeneous haem of erythemia

press slide on it - if blanches = erythema (blood in vessels)

30

desc where fleas, cheyletiella and sarcoptic mange nfection usually occur

fleas = dorsal lumbar/L-S and inner thigh
cheyletiella= dorsal back
sarcoptes = ventral thorax/abdo and eyes and ears