CNS Infections Flashcards

(31 cards)

1
Q

Types of CNS infections

A

abscess
empyema
meningitis
encephalomyelitis

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2
Q

sites of CNS infections

A

brain

cord

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3
Q

etiology of CNS infxns

A

bacterial, viral, fungal

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4
Q

oral sequence of CNS infxn

A
DIRECT extension of acute oral infection
-caries-pulpitis 
-apical periodontitis 
-phlegmon/abscess
-necrotizing ulcerative gingivitis 
bacteremia(uncommon)
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5
Q

what is the most common CNS infection secondary to dental pathology/procedure?

A

CNS abscess

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6
Q

symptoms of CNS abscess

A
changes in consciousness
-focal neurologic signs
speech
visual field defects
paresis
-vomiting
-fever
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7
Q

risk factors for bacterial abscess

A
oral pathology
oral procedure
immunocompromised
chronic illness
chronic heart disease
skull facture
meningitis
sinus infxns
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8
Q

diagnosing CNS abscess

A

symptoms
physical exam
IMAGING
lab results

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9
Q

Tx of bacterial abscess

A

antibiotics and surgery

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10
Q

pathology of bacterial abscess

A

liquefactive

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11
Q

etiology of dental CNS infections

A

87% had intra-oral pathology(caries, gingivitis, periodontitis)
70% ipsilateral
most related to molar removal

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12
Q

where do most abscess happen in the CNS that are related to dental procedures

A

frontal and parietal lobes

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13
Q

organisms that cause CNS abscess

A

gram+ cocci (most)
anaerobes
Gram - bacillus
Gram + bacillus

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14
Q

T/F oral cultures matched with 61% of CNS cultures for microbiology

A

True

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15
Q

can you get a good blood culture of a CNS abscess

A

no 89% negative

*remember most are causes by direct advancement of microbes

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16
Q

Order the microbiology of CNS abscess based on polymicrobial, monomicrobial, and negative.

A

monomicrobial 49%
polymicrobial 47%
negative 4%

17
Q

polymicrobial cultures

A

Actinomyces spp. dominant

  • branching filamentous bacteria
  • gram positive
  • non acid fast
  • normal flora
  • aerobic/microaerophilic
18
Q

mycoses CNS infections

A

immunocompromised patients

  • aspergillus
  • zygomycetes
  • candida spp
  • cryptococcus neoformans
  • dimorphic fungi
19
Q

aspergillus

A
  • **most common fungal pathogen of CNS
  • oral->sinus->CNS in immunocompromised host
  • focal symptoms
20
Q

Pathology of aspergillus

A

septate hypae
single/multiple abscess
granulomata
infarcted brain

21
Q

tx of aspergillus

A

aggressive surgical excision

-amphotericin B + flucytosine (antifungals)

22
Q

Zygomycetes aka mucormycosis

A

*diabetes and immunocompromised

will have rapidly progressive facial swelling

23
Q

species that causes zygomycosis

A

mucor spp.
rhizomucor spp.
rhizopus spp.

24
Q

morphology of zygomycetes

A

wide/ ribbon-like aseptate

90 degree branching

25
candidial infections
uncommon oral etiology unproven immunocompromised
26
forms of candidal infxns
meningitis encephalitits absecess
27
Tx of candidal CNS infections
multimodal antifungals
28
parasitic CNS pathogens
``` Helminths -neurocystercercosis ---Taenia solum (pork tape worm) Protozoa -Toxoplasmosis ---Toxoplasma gondii ```
29
Spirochetes CNS pathogens
``` uncommon Dental related CNS infection not known -Neurosyphilis ----Treponema pallidum -Lyme disease ---borrelia burgdoferi ---Gumma ```
30
Viral CNS pathogens
``` Herpetic gingivostomatitis -HSV1 or HSV2 very common in 6 mos-5 yrs and 20yrs -Herpes simplex encephalitis rare ```
31
Prion disease aka slow virus
``` misfolded protein types: -CJD -CJD new variant -Gerstmann-Straussler syndrome (GSS) -Kuru (extinct) ```