IMHA and Immune Mediated Diseases (E2) Flashcards Preview

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Flashcards in IMHA and Immune Mediated Diseases (E2) Deck (43)
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1

What type of HS rxn is IMHA and against what does the reaction occur?

Type II (2)

Glycophorin on Erythrocytes 

2

What are the clinical signs accompanying IMHA due to tissue hypoxia?

Tachypnea

Tachycardia

Grade II-III systolic hemic murmur

S3 gallop

Increased CO

Vomiting, diarrhea 

 

3

What antibody mainly causes extracascular hemolysis in IMHA? Which causes intravascular hemolysis? Which one activates the compliment system?

IgG

IgM- activates compliment system 

4

What drugs can cause secondary IMHA?

Penicillins

Cephalosporins

Sulfas

Methimazole

Levamisole

Dipyrone

Chlorpromazine

5

How does Feline neonatal isoerythrolysis occur?

When a type A or AB kitten consumes colostrum from a type B cat 

6

What should you include in your clinical exam to ensure no secondary cause of IMHA is present?

3 view thoracic rads

Abdominal US

Heartworm antigen test

PCR (e.g.4Dx)

Fecal exam for hookworm 

7

If you have a low hematocrit but a normal [Hb] what does this indicate?

Hemoglobinemia 

8

What does a Coobs test look for?

Auto-antibodies against RBCs

9

What does an Osmotic Fragility Test confirm?

Hemolysis 

10

What would warrent administration of packed RBCs for a dog with IMHA?

Elevated respiratiojn rate, dyspnea 

Elevated cardiac rate 

11

How do you calculate the amount of blood a patient needs to get via transfusion?

BW (kg) x K x [(25-recipient PCV)/ PCV of doner blood] 

K in dogs = 90

K in cats= 66

12

A 18kg dog is diagnosed with primary IMHA. The current PCV is 12% and the donor blood PCV is 70%. How much blood is required (mL) ? 

300.8mL

BW=18kg

K=90

PCV(recipient)= 12

PCV(doner)=70

18kg x 90 x [(25-12)/70]

13

What is the best treatment for idiopathic IMHA? What second line therapies can be given for immunosuprresion in combination with prednisone?

 

Prednisolone (2mg/kg BID) +Azathioprine (2mg/kg SID then EOD) 

Second line: Cyclosporin SID or Mycophenolate mofetil BID

14

What can be given to a dog with IMHA to prevent a coagulopathy?

Aspirin (low dose)

Clopidogrel

Individually adjusted unfractionated heparin 

15

Hypoalbuminemia is a negative prognostic indicator for a dog with IMHA, what does this indicate?

Severe hepatopathy 

16

What is the hallmark of immune-mediated thrombocytopenia (ITP)?  

Surface bleeding: petechiae, ecchymosis, epistaxis 

17

What is the typical platelet count in a dog with ITP?

<150,000/ mcL 

(N= 200,000-500,000)

18

 Where is the most common place for petechial hemorrhage? What does prolonged surface bleeding eventually lead to?

Gums

Pinna

Anemia

19

Which ITP disease rarely causes petechiae, but does cause bleeding post-op or from trauma?

Von Willebrands Disease

20

You are spaying a young, healthy dog and note inappropriately long clotting times and intra-op bleeding when there should not be any. You check the PTL count, which was normal. What other test should you perform, which would if negative strongly indicate that the dog has Von Willebrands Disease?

PT/aPTT

21

What factors are decreased in a dog with vWB disease? Depletion of which factor causes the most severe bleeding?

Type 1, 2, or 3 vWB factors 

Type 3 is most severe (no circulating vWBF)

22

A BMBT time over _____ is abnormal. List a few breeds predisposed to vWB disease.

4 minutes 

Doberman, Bernese Mnt Dog (get type 1, sometimes 2 dz)

Dutch Kooiker (gets type 3 dz)

Goldendoodle (get type 2 dz)

23

What 2 diagnostics exist for vWB disease?

ELISA plasma vWB

DNA testing 

24

What therapies exist for vWB Disease?

Desmopressin (ADH, Vasopressin...)

Blood components: FWB, FFP, Cryp 

25

What do antibodies target in pripary ITP? How does secondary ITP occur? Which is more common?

Fibrinogen receptor (GpIIb/IIa)

Antigenic stimulation (drug, disease, neoplasia) leading to Ab formaiton 

Secondary is most common, specifically due to neoplasia

26

Name one inflammatory diseaase and one toxin that can cause ITP.

Pancreatitis (SIRS)

Africna bee envenomation 

27

What must you do in addition to a CBC when diagnosing ITP?

Blood smear (count PTLs)

28

What is the downside of the PTL-bound antibodiy test from Kansas university?

Does not differentiate between primary and secondary ITP 

29

How many PTL should you see per high power field? What does it indicate if you count <2 PTL per field?

 

6-8+

<2PTL/ hpf = <50000 total PTLs

30

In addition to removing the offendng cause, what can be given to treat secondary ITP (i.e. what is the best line therapy)? How long does it take to take effect?

Glucocorticoids (immunosuppressive) + Vincristine (anti-mitotic)

7 days