Difference between endocarditis and Acute rheumatic fever?

[Transformers]

Both end up producing vegetations although certainly by a different mechanism and bacteria (i..e- platelet-fibrin deposits in endocarditis and type II immune mediated via rheumatic fever)....I guess I ask this because whenever they show a Gross image of the mitral valve and see vegetations, im like which one is it and I assume you need more info, am I correct?

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[MedicineMike]

Both end up producing vegetations although certainly by a different mechanism and bacteria (i..e- platelet-fibrin deposits in endocarditis and type II immune mediated via rheumatic fever)....I guess I ask this because whenever they show a Gross image of the mitral valve and see vegetations, im like which one is it and I assume you need more info, am I correct?

Yes, usually you would make your assumption of the question stem/hx.

Endocarditis:
-post-dental procedure/on an already messed up valve: viridans strep
-out of nowhere on a previously normal valve/IVDU = staph aureus

For Rheumatic fever vegetation they would tell you it was an immigrant or something and give you other symptoms of fever, blah blah, and maybe some other signs of the jones criteria

 

[pvtbacon]

Both end up producing vegetations although certainly by a different mechanism and bacteria (i..e- platelet-fibrin deposits in endocarditis and type II immune mediated via rheumatic fever)....I guess I ask this because whenever they show a Gross image of the mitral valve and see vegetations, im like which one is it and I assume you need more info, am I correct?

Just to add to what MedicineMike posted,

Prosthetic valve endocarditis - Staph epidermidis w/ biofilm production
Culture negative endocarditis - consider HACEK organisms
Lupus - Libman Sacks (both sides of valve)

 

[loveoforganic2]

Couple more

S. bovis - underlying colon ca.
Tricuspid - S. aureus or Pseudomonas w/IVDU
Enterococci and other normal GI flora - Following GU/GI surgery