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Sumario Endocarditis bacteriana aguda y subaguda resumen

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Endocarditis bacteriana aguda y subaguda, factores de virulencia, fisiopatologia, manifestaciones clínicas, diagnóstico, criterios de Duke.

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ENDOCARDITIS BACTERIANA AGUDA Y SUBAGUDA


Endocarditis bacteriana
Es la inflamación del endocardio del corazón ocasionada por bacterias, en el caso de la
endocarditis bacteriana aguda es ocasionado principalmente por el S. aureus, y en el caso de
la endocarditis bacteriana subaguda es ocasionada principalmente por el Streptococcus
viridans.


Endocarditis bacteriana aguda
La duración es de menos de 2 semanas, es más virulento que el Streptococcus viridans, puede
ingresar hacia el torrente sanguíneo a través de agujas como en el caso de los drogadictos,
por lo que la microbiota del S. aureus que se encuentra en la piel es capaz de diseminarse a
través de este medio.


Agente etiológico
El agente etiológico de la endocarditis depende del tipo que se presente:
Endocarditis bacteriana aguda: Es producida por el Staphylococcus aureus. Se presenta
en un corazón sano, y el microorganismo llega por vía intravenosa produciendo lesiones
destructivas y necrosantes.
Endocarditis bacteriana subaguda: Es producida por Streptococcus viridans. Se presenta
en un corazón enfermo previamente (lesión valvular).


Características del microorganismo
Staphylococcus aureus
 Es una bacteria Gram positiva en forma de coco.
 Se agrupa en racimos.
 Es anaerobio facultativo.
 Algunas cepas producen una cápsula externa mucoide que aumenta su capacidad para
producir infección.
Streptococcus viridans
 Cocos Gram positivos.
 Agrupación en cadenas.
 Anaerobios facultativos.

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