infections of CNS - brain abscess Flashcards Preview

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Flashcards in infections of CNS - brain abscess Deck (9)
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1

most common source of bacterial brain abscess

- pulmonary pathology, particularly bronchiectasis
- cyanotic congenital heart disease
- arteriovenous malformations

2

why are congenital heart and vascular issues risk factors for brain abscess?

tend to shunt directly into left side of heart and miss filtration by pulmonary macrophage system

3

typical quality of bacteria that cause brain abscess

anaerobic or microaerobic (from bowel)

4

when are aerobic bacteria involved in brain abscess

- usually when directly connected to sinuses, middle ear, skull fractures

5

most like locations for hematologically spread abscesses

- areas of ischemic injury

6

locations of abscesses based on origin

ear infection - middle third of temporal lobe, cerebellum
sinuses and dental infections - frontal lobe
hematological - any location, often multiple

7

describe first stage of brain abscess and treatment

- cerebritis
- febrile, still active primary infection
- inflammation, tissue breakdown
- raised intracranial pressure
- abnormalities on imaging but no defined mass on angiography
- antibiotics alone can often resolve it

8

describe second stage of brain abscess and treatment

- cerebritis walls off and becomes true abscess
- afrebrile
- expanding mass
- surgical drainage may be needed

9

complications of untreated brain abscess

- cerebral herniation
- rupture into ventricles causing severe meningitis (WBC count over 10,000/cu mm