Cardio3- Endocarditis

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  1. What distinguishes endocarditis from other valvular diseases?
    causes multisystemic disease- fever, lethargy, etc
  2. What is the most common location and source of endocarditis in cattle?
    • right-sided- tricuspid valve 
    • source- translocation of bacteria from liver/ GI tract important
  3. What is the most common location of endocarditis in dogs and why?
    left-sided valves- subvalvular aortic stenosis predisposes to aortic endocarditis
  4. Endocarditis doesn't really occur in _________ [species].
    cats
  5. What is a classic gross lesion assocaited with endocarditis?
    vegetative- cauliflower valve leaflets
  6. Describe the pathogenesis of bacterial endocarditis.
    bacteremia--> bacteria adhere to valves (depending on virulence of microorganism)--> bacteria agglutinate and inoculate valve surface--> infection begins of surface facing normal blood flow--> vegetations form--> consist of bacterial colonies, thrombi, inflammatory cells, granulation tissue, fibrosis
  7. Where on the valve does endocarditis begin?
    on the surface FACING normal blood flow (ex. MV- atrial surface)
  8. The first thing that happens to a valve with endocarditis is it starts to _______, so you hear....
    leak; murmurs of insufficiency first (after healing attempts, you hear murmurs of stenosis)
  9. What gross lesions appear with chronic endocarditis? (3)
    contractions of lesions (fibrosis) and often calcification, jet lesions
  10. Describe the microscopic pathologic findings with infective endocarditis. (3
    • bacteria, platelets, fibrin, and inflammatory cells
    • valvular destruction
    • localized agranulocytosis (thrombin layers)
  11. What kind of antimicrobial do you need to treat endocarditis and why?
    • bactericidal drugs that can penetrate fibrin (agranulocytosis)
    • fibrin isolates bacterial colonies from host defenses so bacteriostatic won't work (no immune cells get in to kill existing bacteria)
  12. What is unique about Bartonella endocarditis?
    aortic endocarditis in dogs, will culture negative on blood culture, have to use PCR or immunological methods to isolate
  13. Describe the pathophysiology of how endocarditis causes multisystemic disease.
    • infection of the valve—> shed bacteria—>predisposed to systemic inflammation and fever—> vegetations get big and friable—> break off—> emboli bland (no bacteria) or septic (bacteria)—> seed infection downstream—> body mounts immune reaction—> immune complexes form Ab-Ag—> filtered in kidney and joint—> immune mediated polyarthritis (common sign of infectious endocarditis) and glomerulonephritis
    • Inflammation and thrombi- embolic pneumonia, lung abscesses, metastatic infections, vasculitis
  14. What cardiac injuries can occur secondarily to infective endocarditis? (6)
    valve injury, myocarditis, myocardial infarction, arrhythmias (secondary to inflammation), cardiomegaly from volume overload (valve leakage), CHF (chronic)
  15. What are historical findings that predispose to infective endocarditis? (3)
    prior or current infection, immunosuppressive drugs, shaking/shivering
  16. What clinical findings are often associated with endocarditis? (9)
    new heart murmur, hemorrhages/ thrombosis (vasculitis), tachycardia, hyperkinetic pulses, arrhythmia, signs of CHF, fever, polyarthritis, neurologic signs
  17. What are potential causes of heart murmurs with endocarditis? (3)
    regurg of leaky valves, functional ejection murmur due to fever, stenotic valves (if chronic)
  18. Embolic pneumonia usually occurs in the _____________, just like ____________.
    caudodorsal lung field; noncardiogenic edema
  19. What lab findings are consistent with endocarditis? (6)
    • CBC: anemia, leukocytosis (increased neuts or monos), thrombocytopenia (DIC), elevated plasma fibrinogen (LA)
    • Chem: azotemia, increased globulins
  20. What specific lab test are usually run to identify endocarditis and guide the antimicrobial plan?
    • blood cultures (often neg, esp with Bartonella or if animal was recently on an atb)
    • PCR (if culture negative)
  21. With clinical findings __________ is confirmatory of endocarditis.
    echocardigraphy
  22. What echo findings can you use to diagnose endocarditis?
    • thick, irregular, hyperechoic, valve leaflets may oscillate, scarring, SAM
    • cardiac size and function used to prognosticate
  23. What may cause you to suspect right-sided endocarditis? (6)
    bovine, fever, lab signs (fibrinogen), murmur of TR, signs of pneumonia +/- R-CHF
  24. What may cause you to suspect left-sided endocarditis? (4)
    fever, lab signs of inflammation (leukocytosis, inc globulins), murmur of mitral or aortic regurg, polyarthritis
  25. What triad of signs is VERY suggestive of endocarditis in a dog?
    fever, polyarthritis, aortic regurgitation
  26. What are the principals of therapy of endocarditis?
    • antibiotic therapy based on cultures (if neg, based on common isolates for that species)- must be bactericidal and penetrate fibrin, IV initially, long term (6-8weeks)
    • if evidence of thrombosis, aspirin or plavix
  27. Why is the prognosis for endocarditis guarded to poor?
    usually ends with heart failure, permanent valvular lesions always result
  28. What is the "Duke Criteria" for diagnosing infectious endocarditis?
    major + minor clinical signs, laboratory findings, and imaging findings= score for likelihood of IE

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Author:
Mawad
ID:
319063
Filename:
Cardio3- Endocarditis
Updated:
2016-04-30 22:53:55
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vetmed cardio3
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vetmed cardio3
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