A patient with a prosthetic hea valve develops endocarditis eight months after Valve replacement. Most likely organisms responsible is
Staphylococcus aureus
Streptococcus Viridians
Salmonella faecalis
HACEK Group
Ref Harrison 19 th ed pg 816 Prosthetic valve endocarditis (PVE) arising within 2 months of valve surgery is generally nosocomial, the result of intraoperative contami- nation of the prosthesis or a bacteremic postoperative complication. This nosocomial origin is reflected in the primary microbial causes: S. aureus, CoNS, facultative gram-negative bacilli, diphtheroids, and fungi. The poals of entry and organisms causing cases beginning >12 months after surgery are similar to those in community-acquired NVE. PVE due to CoNS that presents 2-12 months after surgery often represents delayed-onset nosocomial infection. Regardless of the time of onset after surgery, at least 68-85% of CoNS strains that cause PVE are resistant to methicillin.
General anatomy