Midterm 2 Flashcards
If an animal has a high relative erythrocytosis, what may be occurring?
- Hemoconcentration
2. Splenic contraction in horses
If an animal has a high absolute erythroctysosis, what may be occurring?
- Physiological response to chronic hypoxia
2. Neoplastic production
What are the clinical sign of anemia?
- Pale mucous membranes
- Lethargy/obtunded
- Anorexia
- Exercise intolerance
- Tachycardia
- Tachypnea
- Systolic murmur
What are the necropsy findings of an anemic large animal?
- Pale tissues
- Thin blood
- Scenic contraction/splenomegaly
- Centrilobular hepatic necrosis
What are the causes of anemia?
- Loss of RBCs from hemorrhage
- Destruction of RBCs due to intra or extravascular hemolysis
- Decreased production of RBC’s
What will you see with RBC morphology when looking at regenerative anemia in ruminants?
- Anisocytosis
- Polychromasia
- Macrocytosis
- Basophilic stippling
- Reticulocytes
What would auto-agglutination suggested on RBC morphology?
Immune Mediated Anemia
What do Howell-jolly bodies on a blood smear suggest?
RBC regeneration except in a horse
What do Heinz bodies suggest on a RBC smear?
Oxidative damage (red maple or onion ingestion )
What common hemoparasites can be evident on a blood smear in large animals?
- Babesia bovis
- Babesia caballi (Equine)
- Anaplasma marginale
What are some unique features of the equine erythron (RBC)?
- Unstable PCV due to scenic contraction
- No peripheral signs of regeneration aka no macrocytosis, polychormasia, or reticulocytes
- Rouleaux formation
- Icteric plasma
- Howell-holy bodies as a normal morphological characteristic
How can non-regenerative anemia be characterized?
Evaluation of the iron status through:
- Serum iron concentration
- Serum ferritin
- Total iron binding capacity (TIBC)
What would a normal ferritin level in a horse suggest?
Bone marrow dysfunction
A horse has a low total iron binding capacity (TIBC) level with a low serum iron concentration..what does this suggest?
Anemia of chronic disease
What would iron deficiency anemia looks like on a iron panel?
Low serum iron concentration and high total iron binding capacity (TIBC) OR
A low serum iron concentration, normal TIBC, and low ferritin levels
If a horse presents with a normal TIBC, a low FE, and a low ferritin level, what does this suggest?
Iron deficiency
A horse presents with low Fe values, normal ferritin, and normal TIBC, what does this suggest?
Anemia of chronic disease
A ruminant presents with anemia, there are immature RBC’s present and the TP is low…what does this suggest?
Acute blood loss anemia
What parameters would be abnormal in a ruminant with hemolytic anemia?
There would be immature red blood cells present indicating regeneration and the TP levels would be normal.
What type of anemia will a ruminant likely have if there are no immature red blood cells present and the TP is low?
Acute blood loss anemia that needs to be reevaluated in 72 hours.
A cow presents with anemia. There are no immature RBC’s present,the TP is normal, and there is no evidence of hemolysis ..what is going on?
A non-regenerative anemia
What are the steps in the diagnosis when an animal is anemic?
- CBC
- Urinalysis
- Feces for occult blood
- U/S or PE of body cavities
- Coomb/s test/flow cytometry
- Coggin’s test if a horse
- Bone marrow aspirate or biopsy
- Coagulation assays
- Evaluation of bleeding time
- AT-III levels
If a large animal has non-regenerative anemia of chronic disease, what will be on the CBC?
Neutrophilic leukocytosis due to stress or inflammation
What tests can be used to evaluate hemorrhage in an animal with anemia?
- Urinalysis with a dipstick, microscope to look for RBCs and to distinguish between hemoglobin and myoglobin
- Feces for occult blood
- Body cavities with U/S
What tests can be used to evaluate hemolysis in a large animal with anemia?
- Coombs test with flow cytometry
2. Coggins test (horse)
If a horse has a positive coggins test, what does this mean?
Equine Infectious Anemia
If a large animal has a positive coomb’s test, what does this mean?
Immune mediated anemia
What is needed to demonstrate a regenerative anemia response when the M:E ratio is normal (1:1 to 2:1)?
Bone marrow aspirate or biopsy
What is the M:E ratio when a large animal has a regenerative anemia?
< 0.5:1
What tests are part of a coagulation assay in large animals?
- PT
- APTT
- ACT
- Fibrin/fibrinogen degradation products
What are the steps in treating anemia?
- Control hemorrhage
- Treat underlying cause
- Support tissue oxygen volume with IV fluid therapy
- Reasses and determine is blood transfusion needed
What is the main indication in an anemic large animal for a blood transfusion?
- 10 L blood lost ( more than 25%)
2. PCV < 15% and Lactate > 4mmol/L
What is the universal blood donor for horses?
Aa & Qa negative
Which diseases should a donor horse/ruminants blood be free of?
- EIA
- EVA
- BLV
How long will transfused RBC’s stay in a recipient for?
2-4 days
You need to do a blood transfusion in a horse, but there is no universal donor and the patient has received a previous transfusion..what do you do?
Do a major and a minor cross match
What is the difference between a major and minor blood cross match?
Major: Donor’s RBC’s with recipients serum
Minor: Recipients RBC’s with donor serum
What is the safe blood donor volume from an adult large animals?
1.6% donor BW
How do you determine the blood volume needed in a patient?
Patient BW x 0.08 x (desired PCV-receipent PCV/Donor PCV)
What is the target PCV for a large animal needing a blood transfusion?
15-20%
What premedication should be administered prior to a blood transfusion?
- Antihistamine
2. NSAIDS
What is the rate at which you should give a blood transfusion in large animals and what steps are involved ?
- Start slow at 0.1ml/kg/hr
- Monitor TPR, attitude and watch for hives
- Increase rate gradually every 5-10 min if no Rxn
- Limit to 20ml/kg/hr
When and why does a tranfusion reaction usually occur?
Due to donor-recipient blood group incompatibilities and can occur during the first transfusion
What are the clinical signs of a blood transfusion reaction?
- Tachypnea
- Tachycardia
- Urticaria
- Pyrexia
- Pulmonary edema
- Colic
- Shock/collapse
What are the steps when dealing with a blood transfusion reaction?
- Slow/stop transfusion and give crystalloid fluids instead
- NSAIDS or antihistamines
- Dexamethason/prednisone
- Epinephrine if there is anaphylaxis
What are some blood substitutes that can be used in a blood transfusion?
- Oxyglobin
What is TRALI and when does it occur?
Transfusion-associated lung injury occuring 1-2 days after a blood transfusion
What are blood transfusion reactions that can occur “late”?
- TRALI
- Hemolysis
- SIRS
- Serum hepatitis (Theiler’s diease )
What disease in horses is commonly associated with the administration of tetanus antitoxin given 4-6 weeks before clinical signs occur?
Theiler’s disease ( serum hepatitis)
A horse is suffering from anemia…other than a blood transfusion, what can you treat with?
- Iron supplements
- Vitamin B12
- Copper glycinate
- Anabolic steroids
- Oral therapy with RED CELL
What are some important causes of acute hemorrhage?
- Coagulopathies
- Thrombocytopenia
- DIC
- Guttural pouch mycosis in horses
What are some important causes of chronic hemorrhage?
- Coagulopathies
- Thrombocytopenia from EIA and BVD
- GI loss
- Internal parasites
- Aromas always ulcers in ruminants
- Caudal vena cava syndrome in ruminants
- Jejunal hemorrhage syndromes in ruminants
How would you diagnose guttural pouch mycosis?
Endoscopy
How is guttural pouch Mycosis treated?
Surgically, as there is not time for medical treatment since it can take 6 months
What is the main clinical sign of vena caval thrombosis and in what species?
Bilateral epitaxis in cattle
What is the pathogenesis behind vena cava thrombosis ?
Ruminal Acidosis- lliver abscess-thrombus in the caudal vena cava -metastatic pneumonia- erosion of pulmonary veins
How is vena canal thrombosis diagnosed and treated?
Endoscopy and U/S
It is fatal
A high producing dairy cow presents with hyperglycemia, hypermagnesemia hyponatremia, hypochloremia, hypokalemia along with anorexia, tachycardia, and hypothermia. She is bleeding from her rectum. What may be going on?
Jejunal hemorrhage syndrome
What causes jejunal hemorrhage syndrome?
Poor diet and management
What will jejunal hemorrhage syndrome look like on ultrasound?
Distended loops of intestine
How is jejunal hemorrhage syndrome treated?
Surgery , but prognosis is guarded
What are the most common causes of hemoperitoneum in large animals?
- Spleen trauma in mares
- Reproductive tract injury with uterine artery rupture
- Neoplasia
What clinical signs are seen in a horse with hemoperitoneum?
- Anemia
2. Colic
How is hemoperitoneum diagnosed?
- Swirling echogenic fluid on U/S
2. Abdominocentisis
How is hemoperitoneum treated?
- Fluid therapy
- Blood transfusion
- Antifibrinolytics and procoagulant agents
- Restricted physical activity
What is a signal that a horse will have a poorer prognosis with hemoperitoneum?
Prepartum hemorrhage
What is the prognosis for a large animal with hemoperitoneum?
Fair with 54 to 74% survival rate
What large animal species is more susceptible to nematode infection?
Goats
What type of abomasal ulcer is most often associated with anemia in cattle?
A grade 2 ( bleeding,non-perforation)
What are the causes of a anemia causing ulcer in cattle?
- Lymphosarcoma
How are abomasal ulcer diagnosed?
Fecal occult blood tests
What it’s the treatment for abomasal ulcers?
Treat the underlying disease that is leading to ileus, feeed more fiber and less grain, and don’t used oral gastroprotectants as they don’t work
What causes hemophilia A?
It is a sex linked recessive traits affecting males that involves a factor VIII deficiency
What diagnostic signs will you see with hemophilia A?
Prolonged PTT dues to the intrinsic pathway being compromised from a factor VIII deficiency
What diseases are associated with vasculitis in horses?
- Equine Purpura hemorrhagica (EPH)
- Equine Viral arthritis (EVA)
- Equine Infectious Anemia (EIA)
- Equine Anaplasmosis
- Idiopathic
What disease are associated with vasculitis in ruminants?
- Malignant catarrhal fever (cattle)
2. Bluetongue (sheep)
What is the definitive diagnosis for vasculitits?
Full thickness punch biopsies at least 6 mm of the skin analyzed with histopathology
What is the cause of purpura hemorrhagica?
Type III hypersensitivity response to bacterial/viral antigens
What are the clinical signs of purpura hemorrhagica?
- Limb edema
- Purpura
- Myositis
- Colic
- Reluctance to move
What bacteria/viruses can cause purpura hemorrhagic in horses?
- Streptococcus spp.
- Corynebacterium
- Influenza virus
- Strangles vaccination
How is purpura hemorrhagica treated?
- Treat underlying cause
- Corticosteroids for 2-4 weeks
- Treat edema
What is the cause of Equine anaplasmosis?
Anaplasma phagocytophilum
Where does anaplasma replicate?
Granulocytes- neutrophils
What are the clinical signs of equine anaplasmosis?
- Vasculitis with fever and limb edema
2. Secondary IMHA
How is Equine anaplasmosis treated?
- Oxytetracycline
- NSAIDS
- IV fluid therapy
T/F: Equine anaplasmosis patients have the ability to spontaneously recover in 2-3 weeks
True
How is anaplasmosis diagnosed?
- Morulae in neutrophils after 3 days of fever
- PCR positive for three weeks
- Seroconversion after 12 days
What is the vector for equine anaplasmosis?
Ixodes Pacificus
I. Scapularis
What are the 3 mechanisms of thrombocytopenia?
- Abnormal sequestration
- Shortened platelet survival
- Decreased/absent platelet production
What are the clinical consequenes of thrombocytopenia?
1Petechial hemorrhage and bruising
What are the causes of Immune-mediated thrombocytopenia?
Primary causes are idiopathic. Secondary:
- Penicillin or ceftiofur administration
- Lymphosarcoma
- EIA or BVD infections
- Alloimmune in foals
- Autoimmune
A patient has thrombocytopenia and the platelet level is < 40,000/ul, what does this indicate?
Hemorrhage in response to trauma
A patient has thrombocytopenia and the platelet level <10,000/ul , what does this indicate?
Spontaneous bleeding
How is immune mediated thrombocytopenia diagnosed?
- CBC- Platelet counts <100,000/u, mild anemia, and hypoproteinemia
- Coagulation panel: prolonged bleeding time with normal PT, PTT and fibrinogen
- Bone marrow biopsy: megakaryocytic and erythropoietin hyperplasia
- Flow cytometry: Ig on platelet surface
What is the gold standard diagnosis for immune mediated thrombocytopenia?
Flow cytometry with Ig on platelet surfaces
What is the treatment for immune mediated thrombocytopenia?
- Stop triggering medications and treat underlying disease
- Immunosuppresion with corticosteroids ( dexmethasone/prednisone)
- Blood transfusion
How long would you treat a horse with immune mediate thrombocytopenia with corticosteroids
10-21 days with a platelet count normal for at least 5 days
What would you see on a bone marrow biopsy with immune mediated hemolytic anemia?
Megakaryocytic and erythyroid hyperplasia…aka a regerative response
What infectious agents are likely to cause immune mediated thrombocytopenia in large animals?
- Type II BVD in cattle
- Equine infectious anemia in horses
- Anaplasma phagocytophila in horses
- Enzootic lymphosarcoma in cattle
What are the clinical signs of DIC?
- Generalized thrombosis and/or hemorrhage
2. Multiple ischemia organ failure (MODS)
How is DIC diagnosed?
- Thrombocytopenia
- Prolonged PT, PTT, reduced fibrinogen and elevated D-Dimers
- Clinical signs
Need 3 or more lab changes and C/ S to diagnose
What is the cornerstone of treatment for DIC?
manage/treat the underlying disease
Besides treating the underlying cause of DIC, what other treatments can be used?
- IV fluid therapy
- NSAIDS like flunixin meglumine
- Heparin for At-III
- Whole blood/plasma transfusions
What toxin is a common cause of DIC in large animals?
Moldy sweet clover
What is the toxic principle of moldy sweet clover?
Dicoumarol from improperly cured hay or silage
How does moldy sweet clover cause DIC?
The toxin is a vitamin K antagonist with interferes with production of factors II, VII, IX, and X
How is moldy sweet clover poisoning treated?
- Stop feeding clover
- Administer vitamin K1
- Whole blood/plasma transfusion as required
What diseases in large animals are caused by RBC loss?
- GP mycosis
- Vena Caval Thrombosis
- Jejunal Hemorrhage syndrome
- Hemoperitoneum
- Intestinal parasites
- Abomasal ulcers
- Hemophilia A
- Purpura hemorrhagica
- Equine anaplasmosis
- EIA
- IMTP
- Moldy sweet clover poisoning
- Warfarin toxicosis
Which diseases in large animals are associated with intravascular hemolysis?
- Equine Piroplasmosis
- Bovine Babesiosis
- Bacillary hemoglobinuria
- Leptospirosis
- Heinz body anemia’s
- Copper toxicity of ruminants
- Water intoxicating of calves
- Post-parturient hemoglobinura
What disease in large animals are associated with extravascular hemolysis?
- Immune-Mediated hemolytic anemia
- Equine infectious Anemia
- Anaplasmosis in ruminants
- Mycoplasma haemolame in camelids
What anemia in large animals are associated with decreased RBC production?
- Depression anemia
2. Anemia of chronic disease
What are the causes of depression anemia in large animals?
- Vitamin/mineral deficiency
- Inflammatory chronic disease
- Renal or hepatic failure
What vitamin/mineral deficiencies can cause depression anemia in large animals?
- Iron
- Copper
- Cobalt (B12)
Hemoglobinemia and hemoglobinuria are associated with ________ hemolysis, while hyperbilirubinema is associated with ________ hemolysis.
Intravascular
Extravascular
What causes equine piroplasmosis and how is it transmitted?
- Babesia caballi
- Theileria equi
Both spread by tick vectors
What is the equine piroplasmosis infectious agent that is reportable?
Theileria equi
What are the clinical signs of equine piroplasmosis?
- Fever
- Obtunded
- Anorexia
- Incoordination
- Nasal/ocular discharge
- Hemoglobinemia/Uria
On blood smears, what is seen with babesia caballi versus theileria equi?
Large piroplasms with B. caballi and small piroplasms with T. Equi…the piroplasms are in RBC’s
How is Equine piroplasmosis treated?
Imidocarb
Which infectious agent that causes equine piroplasmosis is harder to clear and has more severe Clinical signs?
T. Equi
Wher does bovine babesiosis occur?
Not in the USA
What is the other name for bacillary hemoglobinura and what clinical signs are seen?
Red Water
- Sudden death
- Port wine urine form hemoglobinuria (intravascular hemolysis)
- Fever
- Bloody nasal/rectal distract 5. Palor/icterus
What causes bacillary hemoglobinuria?
Clostridium hemolyticum B toxin
What parasite is bacillary hemobloginuria associted with?
Faciola hepatica
How is bacillary hemoglobinuria treated?
- Penicillin or oxytetracycline IV or IM
2. Blood transfusion
How is bacillary hemoglobinuria diagnosed?
- Post Mortem with necrotic hepatic infarction with clostridium overgrowth
What are the clinical signs of leptospirosis infection in large animals?
- Hemorrhage in the kidney, eyes, reproductive tract and lungs
- Abortion
- Uveitis
What two lepto serovars are associated with acute hemolytic syndrome?
- L. Pomona
2. L. Icterohaemorrhagicae
What are the causes of Heinz body anemia?
- Phenothiaine tranquilizers
- Toxic plants
- Selenium deficiency
What type of hemolysis does Heinz body anemia cause?
Intra and extravascular
What clinical signs are seen with Heinz body anemia?
- Methemoglobinemia
2. Hemoglobinemia
What toxic plants can cause Heinz body anemia?
- Red maple (equids)
- Brassica spp.
- Wild onion
What is the toxic principle of brassica and wild onion toxicity?
S-methylcysteine sulfoxide metabolize to dimethyl disulfide which causes RBC oxidation
How is Heinz body anemia treated?
- Remove toxic source
- Activated charcoal
- Methylene blue in ruminants
- Vitamins C
- IV fluid therapy
- Blood transfusion
- Don’t give NSAIDS if kidney disease an can cause colic
Why would you want to be careful giving an NSAID in an animal with Heinz body anemia?
It can cause colic and kidney issues
What can cause primary copper toxicity in ruminants?
Excessive ingestion/injection of copper
What can cause secondary copper toxicity in ruminants?
- Molybdenum deficiency
2. Hepatotoxic plants
Which large animal species is most susceptible to copper toxicity?
Sheep
How is copper toxicity diagnosed?
High serum and liver copper levels
If a sheep is in the acute hemolytic phase of copper toxicity, how it is diagnosed?
Non-regenerative anemia with high serum/liver copper levels
If a sheep is in the pre-hemolytic phase of chronic copper toxicosis, how it it diagnosed?
Elevate liver enzymes and high copper in liver biopsy
How is copper toxicity treated?
- Measure copper levels in liver
- Identify/ remove sources of copper
- Supplement with zinc and iron and decrease molybdenum
A calf presents with serum hypo-osmolarity, mild anemia, and hemoglobinemia/nuria..what is likely going on?
Water intoxication
How does water intoxicating lead to clinical signs in calves?
Rapid ingestion of water causes osmotic lysis of RBC’s
A dairy cow presents with hypophosphatemia and hemoglobinemia/uria 1 month after calving..what is going on?
Post-parturient hemoglobinuria
What may post-parturient hemoglobinuria be associated with?
Copper and selenium deficiency
What can cause secondary immune mediated hemolytic anemia?
- Penicillin
2. Lymphosarcoma
What are the clinical signs of immune mediated hemolytic anemia?
- Fever
2. Tachycardia with pallor-anemia
How is immune mediated hemolytic anemia diagnosed?
- Saline agglutination test
- Direct Coomb’s test
- Flow cytometry
How is immune mediated hemolytic anemia treated?
- Treat underlying cause
- Dexamethasone
- Blood transfusion if needed
This disease is lifelong in horses, causes extravascular hemolysis, is transmitted via blood and is caused by a lentivirus…what is it?
Equine infectious anemia
How does a persistent infection of equine infectious anemia occur?
The virus persists in monocytes
T/F: Equine infectious anemia is reportable.
True
What are the c/s of equine infectious anemia?
- Vasculitis
- Glomerulonephritis
- Hepatitis
- Thrombocytopenia
- Anemia in subacute to chronic cases
What is the difference between acute and chronic equine infectious anemia?
Acute occurs within 7-30 days while chronic is > 30 days. Acute has no anemia.
How is EIA diagnosed?
Coggins test with AGID and ELISA
When can EIA be diagnosed via a coggins test?
10 days post-infection (seroconversion)
What is the treatment for EIA?
None, must be euthanized or permanently quarantined
How do ruminants become infected with anaplasmosis?
The blood of carrier animals taken up by tick or flies
How does anaplasmosis in ruminants cause clinical signs?
Auto-antibody production leading to extravascular hemolysis
What are the different phases of anaplasmosis in ruminants ?
- Acute
- Convalescent
- Chronic carrier
How is anaplasmosis in ruminants diagnosed (acute versus chronic phase) ?
- Inclusion bodies in RBC’s on fresh blood smear (acute phase)
- PCR
- cELISA (chronic)
What are the clinical signs of an acute phase of anaplasmosis in ruminants?
- Fever
- Late term abortion
- Severe anemia with no hemoglobinuria
What are the clinical signs of an chronic phase of anaplasmosis in ruminants?
- Weight loss
2. Icterus