Small Animal Diseases/Care Flashcards
What is vasculitis?
(Inflammation of blood vessels)
Is vasculitis localized or systemic?
(Could be either)
Is vasculitis primary or secondary?
(Could be either, primary rare in animals)
Why do antibodies produced by plasma cells in response to viruses found in blood vessels sometimes instead cross-react to blood vessel walls?
(Molecular mimicry)
What two things are released by neutrophils that are triggered by antibodies?
(Chemokines that attract more neutrophils and reactive oxygen species)
What occurs subsequently to the narrowing of the affected vessel’s lumen due to occlusion with inflammatory cells, thrombosis, hyperplasia, and/or fibrosis if chronic? Two answers.
(Tissue ischemia and organ dysfunction)
What are the common sites for vasculitic lesions in small animals? Six answers.
(Limbs, paws, ear pinnae, lips/oral mucosa, tip of tail, and scrotum)
What clinical sign results from increased vascular permeability due to vasculitis?
(Edema)
What lung patterns are associated with vasculitis?
(Diffuse interstitial to alveolar pattern)
What blood work abnormalities are associated with vasculitis in small animal patients? Four answers.
(Anemia, thrombocytopenia, hypoalbuminemia, other changes depending on organs affected)
What two drugs are used for the treatment of less severe cases of vasculitis?
(Doxycycline and pentoxifylline)
What drug is used if treatment with doxycycline or pentoxifylline doesn’t work or in more severe cases of vasculitis?
(Corticosteroids)
What is the term for the reduction in red blood cell mass?
(Anemia)
Anemia leads to a decrease/increase in oxygen delivery to tissues.
(Decrease)
One of the physiologic responses to anemia is to increase cardiac output, below are ways that the body increases cardiac output, give the component of cardiac output (heart rate or stroke volume) that they alter:
- Hypoxia stimulates chemoreceptors
(Increases heart rate)
One of the physiologic responses to anemia is to increase cardiac output, below are ways that the body increases cardiac output, give the component of cardiac output (heart rate or stroke volume) that they alter:
- Catecholamine release increases left ventricular contractility
(Increases stroke volume)
One of the physiologic responses to anemia is to increase cardiac output, below are ways that the body increases cardiac output, give the component of cardiac output (heart rate or stroke volume) that they alter:
- Anemia reduces blood viscosity
(Increases stroke volume)
Where does the body redistribute blood flow when responding to anemia? Away from where and towards what.
(Away from the periphery and towards cardiac and cerebral)
What do the kidneys excrete in response to anemia that stimulates the proliferation and differentiation of RBC precursors in bone marrow?
(Erythropoietin)
How does the body improve oxygen extraction in response to anemia?
(Increases production of 2,3 DPG which promotes the release of oxygen from hemoglobin)
The heart rate of an anemic patient will be increased/decreased.
(Increased)
The respiratory rate of an anemia patient will be increased/decreased.
(Increased)
Why might you hear a heart murmur in a patient with anemia?
(Altered blood viscosity)
Do chronic or acute anemia patients have more clinical signs?
(Acute)
What are the three causes of anemia?
(Hemorrhage, hemolysis, and hypoplasia)
What is the main difference between hematocrit and packed cell volume?
(HCT is calculated, PCV is directly measured)
What blood value tells you that your patient has regenerative anemia?
(Increased reticulocytes)
What two things do normal or decreased reticulocytes suggest in an anemia patient?
(Bone marrow hypoplasia or pre-regenerative anemia)
What is the time period between anemia onset and bone marrow release of reticulocytes?
(2-5 days)
How do you get an absolute reticulocyte count when reticulocytes are reported in a percentage?
(Multiply reticulocyte % by RBC count)
What is the minimum value of canine reticulocytes that indicates if your patient has regenerative anemia?
(>95 thousand cells/microliter)
What is the minimum value of feline reticulocytes that indicates if your patient has regenerative anemia?
(>60 thousand cells/microliter)
What two blood smear findings indicate the presence of reticulocytes?
(Polychromasia and anisocytosis)
What are classic RBC indices changes that are seen with reticulocytosis?
(Macrocytosis and hypochromasia)
Nucleated RBCs on a blood smear are called what term that when present without reticulocytosis is associated with bone marrow disease or injury, splenic diseases, or lead poisoning?
(Metarubricytosis)
You have a patient that has non-regenerative anemia and the following RBC indices changes, give the disease/deficiency that can cause these changes (some have multiple):
- Macrocytic and normochromic
(FeLV and B12 or B1 deficiency)
You have a patient that has non-regenerative anemia and the following RBC indices changes, give the disease/deficiency that can cause these changes (some have multiple):
- Microcytic and hypochromic
(Iron deficiency)
You have a patient that has non-regenerative anemia and the following RBC indices changes, give the disease/deficiency that can cause these changes (some have multiple):
- Microcytic and normochromic
(Portosystemic shunt)
Of the gastrointestinal tract sources of blood loss (melena, hematochezia, and hematemesis) which is more likely to result in anemia?
(Melena)
What are the three common causes of acute blood loss?
(Trauma, coagulopathy, and neoplasia)
What are the four common causes/locations of chronic blood loss?
(GI tract, fleas, urinary tract, and respiratory tract)
Describe the pulse of a dog with acute blood loss and associated hypovolemia.
(Weak and thready)
Why will your externally hemorrhagic anemic patient also have a decreased total protein?
(Plasma protein is being lost with the RBCs)
Why can chronic external hemorrhage cause non-regenerative anemia?
(Loss of iron leads to non-regenerative anemia)
What RBC cell types are the results of RBC fragmentation? Three answers.
(Keratocytes, acanthocytes, and schistocytes)
A blood transfusion should be given to an anemic patient when there are signs of poor _____________________ such as weakness and/or depression, tachycardia, tachypnea, and bounding or weak femoral pulses.
(Tissue oxygenation)
What are the two indications for the use of fresh whole blood prior to refrigeration?
(Blood loss anemia and coagulopathy)
Why are packed red blood cells more appropriate for hemolytic or hypoplastic anemias?
(Those patients tend to have normal plasma proteins so don’t need that from whole blood)
What is the formula for determining the amount of blood you should administer when doing a blood transfusion?
(((Patient body weight in kgs multiplied by blood volume in ml/kg)*(Desired PCV - patient PCV))/Donor PCV)
What is the most clinically relevant dog blood type?
(DEA 1.1)
A DEA 1.1 negative dog who has never received a blood transfusion before can be given DEA 1.1 + blood for their first transfusion but will no longer be able to receive DEA 1.1 + blood in the future, why is that?
(They will develop antibodies to the DEA 1.1 + blood from the first transfusion, will have to use DEA 1.1 - blood for any future blood transfusions)
What type of blood should type A cats receive only?
(Type A)
What type of blood should type B cats receive only?
(Type B)
What substances do you use for cross-matching between a patient and a donor?
(Patient → serum; donor → RBCs)
When should you perform a cross-match? Two scenarios.
(When transfusion hx is unknown and when it has been greater than three days since their last transfusion and you want to give them another)
What are the clinical signs of volume overload induced by transfusion associated circulatory overload?
(Tachypnea, serous nasal discharge, and pulmonary crackles)
Patients receiving a transfusion can commonly show signs of a nonhemolytic febrile reaction to the blood, what can be done to minimize this reaction?
(Slow the transfusion rate)
What is done to treat hemolytic transfusion reactions after stopping the transfusion? Four answers.
(IV fluids, oxygen, corticosteroids, and vasopressors if they have hypotension)
What is the term for the form of hemolysis that occurs by phagocytosis of RBCs by macrophages in the spleen, liver, and bone marrow?
(Extravascular)
What substance being abnormally present in the blood and urine is a result of and indicative of extravascular hemolysis?
(Bilirubin)
What is the term for the form of hemolysis that occurs within the blood vessels?
(Intravascular)
What substance being abnormally present in the blood and urine is a result of and indicative of intravascular hemolysis?
(Hemoglobin)
(T/F) Extravascular hemolysis is always present in cases of intravascular hemolysis.
(T)
What can the partial phagocytosis by macrophages of an RBC result in that be seen on a blood smear for an extravascular hemolytic patient?
(Spherocytes)
What type of cell do you see on the cytology of blood from an intravascular hemolytic patient?
(Ghost cells)
Hemolytic patients will have weak/thready or bounding pulses?
(Bounding)
What is the most common cause of extravascular hemolysis in dogs and cats?
(Immune mediated hemolytic anemia)
The activation of what system causes the concurrent intravascular hemolysis in some cases of IMHA?
(Complement system activation)
Is primary or secondary IMHA more common?
(Primary aka idiopathic)
What are the four potential triggers for secondary IMHA?
(Drugs, vaccination, infections, and neoplasia)
What three things are considered strong evidence for IMHA?
(Autoagglutination, spherocytosis, and positive Coombs test)
What is the first line treatment for IMHA?
(Prednisone/prednisolone)
What is the immunosuppressive dose of prednisone/prednisolone?
(2 mg/kg/day)
In what two situations would you consider secondary immunosuppressants in combination with corticosteroids?
(If the patient is refractory to corticosteroid tx and/or if the patient may not tolerate corticosteroids well long term)
Does azathioprine have a slower or faster onset of action when compared to prednisone?
(Slower)
What are the three side effects of azathioprine?
(Bone marrow suppression, hepatotoxicity, and pancreatitis)
Why should azathioprine not be used with mycophenolate?
(They have similar mechanisms of action → worse side effects)
What are the two side effects of mycophenolate?
(GI → diarrhea, vomiting, and anorexia; bone marrow suppression)
Does cyclosporine have a slower or faster onset of action when compared to prednisone?
(Faster)
Is the vegetable oil based Sandimmune formula of cyclosporine recommended or not recommended? What about the ultra micronized Atopica formula?
(Sandimmune → not recommended; Atopica → recommended)
Should cyclosporine be administered with a full meal or on an empty stomach?
(Empty stomach)
Immunosuppressants exacerbate risk of infection but cyclosporine increases the risk for what type of infection particularly?
(Fungal)
What two drugs can be used to prevent systemic thromboembolisms, a common complication of IMHA?
(Low dose aspirin or clopidogrel)
What is the bacterial agent for infectious anemia in cats?
(Hemotropic mycoplasma)
Of laboratory findings, what might be present in infectious anemia cases that is not typically present with IMHA (so you can potentially use this to differentiate between the two)?
(Thrombocytopenia)
What are the feline risk factors for hemotropic mycoplasma infections? Three answers.
(Male, outdoor access, FeLV/FIV positive)
What is the highly sensitive diagnostic test for hemotropic mycoplasma?
(PCR)
What two drugs are used for treatment of hemotropic mycoplasma?
(Doxycycline or fluoroquinolones)
What dog breed has a high seroprevalence of B. canis vogeli but that also often lacks clinical signs?
(Greyhounds)
What dog breed has a high prevalence of B. gibsoni but that also often lacks clinical signs?
(American pit bull terriers)
Which of the babesia species is considered the small one?
(Babesia gibsoni)
What are the two forms of cytauxzoonosis clinical disease?
(Tissue phase and erythrocyte phase)
What antioxidant does the intracellular systems that reverse hemoglobin oxidation utilize?
(Glutathione)
(T/F) All patients with hemolysis should have abdominal radiographs performed.
(T)
How is zinc toxicity diagnosed?
(Take a radiograph)
What type of hemolytic anemia does zinc toxicity induce in animals?
(Heinz body anemia)
What type of hemolytic anemia does acetaminophen ingestion induce in animals?
(Methemoglobinemia)
Why is methemoglobinemia called a ‘physiologic anemia’?
(RBCs are present and not decreased, just unable to carry oxygen appropriately)
What does N-acetylcysteine do to intracellular glutathione levels that makes it useful in treatment for oxidant-induced hemolytic anemia?
(Increase intracellular levels of glutathione)
What is another term for microangiopathic hemolytic anemia?
(Fragmentation hemolytic anemia)