Viral CNS Infection Flashcards

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2
Q

important physical exam findings to rule out when suspecting viral meningitis

A

pulmonary: rule out pneumonia; dermatological: rash could indicate bacterial

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3
Q

important lab tests to rule out when suspecting viral meningitis

A

test for syphilis, HIV; looks at WBC count and determine if monocyte or neutrophil predominance (neutrophil means bacterial); urine; chest x-ray for TB; CSF glucose and protein, CSF gram stain

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4
Q

when a person presents with fever and headache, what are our two largest concerns?

A

meningitis & encephalitis (or combination)

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5
Q

if it is acute meningitis, what organisms would we suspect?

A

enterovirus, strep pneumo, neiss meningitidis

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6
Q

if it is chronic meningitis, which organisms would we suspect?

A

mycobacteria TB, fungal, sarcoid, malignancy

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7
Q

encephalopathy

A

altered consciousness with no evidence of inflammation in the CNS on imaging or CSF analysis

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8
Q

encephalitis

A

altered consciousness, evidence of CNS inflammation or imaging (virologically confirmed if pathogen identified in CSF by culture/PCR)

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9
Q

meningism

A

headache with neck stiffness and/or photophobia; NO evidence of altered consciousness or inflammation

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10
Q

purulent meningitis

A

meningism (headache, photophobia and/or stiff neck) with high WBC, predominance of PMNs, low glucose, high protein (microbiologically confirmed if pathogen identified)

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11
Q

aseptic meningitis

A

meningism with moderately high WBC (lymphocyte predominance), normal CSF glucose, high CSF protein (viral, TB)

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12
Q

prisoner, homeless, or immigrant is at greatest risk for what type of meningitis?

A

chronic from mycobacterium TB

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13
Q

Ohio River Valley is associated with what bacterial meningitis?

A

subacute histoplasma

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14
Q

agammaglobulinemia is associated with what form of meningitis?

A

chronic enterovirus meningitis

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15
Q

NSAID use is assoc. with what form of meningitis?

A

drug-induced acute meningitis

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16
Q

HIV is assoc with what meningitis organisms?

A

toxoplasma abscess, cryptococcal meningitis, HIV/CMV meningoencephalitis

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17
Q

splenectomies increase susceptibility to meningitis with what organisms?

A

encapsulated orgs like n. meningitidis

18
Q

what organism causes recurrent meningitis?

A

HSV-2

19
Q

what are the 4 ways in which viruses can enter the CNS?

A
  1. directly across cerebral capillary endothelial cells (infect endo cell, infect glial cell, carried by infected monocyte), 2. infect choroid plexus epithelium (more permeable), 3. along olfactory nerves, 4. along peripheral sensory nerves
20
Q

name 2 noninfectious causes of meningitis

A

auto-immune diseases (looks like viral), NSAIDS, sulfa drugs (looks like bacterial)

21
Q

emergency management for a patient with suspected meningitis

A

1) drop/air precautions, 2) resuscitate if necessary, 3) blood cultures from 2 locations, 4) lumbar puncture within 30 min, 5) empiric antibiotics, 6) CT or MRI if lesion expected

22
Q

74% of aseptic meningitis cases in children were a result of _____________.

A

enterovirus

23
Q

the top 3 bacterial causes of meningitis in children were?

A

strep pneumo, neiss meningitidis, GBS

24
Q

major causes of viral meningitis

A

enterovirus (very common, in the summer, coxsackie, echo, dx by PCR) & herpesviruses (HSV, VZV, CMV, HHV6); also influenza A, HIV, West Nile

25
Q

bacterial causes of aseptic meningitis

A

spirochetes, mycoplasma, mycobacteria

26
Q

evidence of enteroviral meningitis

A

exanthem, conjunctivitis, pericarditis, HFM disease, herpangina, pleurodynia in late summer/early fall

27
Q

CEMA

A

(rare) chronic enteroviral meningoencephalitis in agammaglobulinemia: HA, seizures, hearing loss, coma, weakness, ataxia, loss of cognitive skills

28
Q

who dies from enteroviral meningitis?

A

the very young and the old (about 5% of each)

29
Q

what is the greatest cause of encephalitis in the US?

A

UNKNOWN (as much as 86% of deaths, 60% of hospitalizations)

30
Q

symptoms of HSV encephalitis

A

abnormal CSF with high protein, normal glucose, lymphocyte predominance, and RBCs in CSF; focal EEG or MRI positive necrotizing, usually temporal lobe lesion

31
Q

what % of West Nile virus infections are asymptomatic, fever, or neuroinvasive?

A

80% asymptomatic, 20% fever, less than 1% neuroinvasive disease (usually elderly)

32
Q

diagnosing CMV encephalitis

A

acute deterioration in mental status with elevated protein in CSF (HIV, transplant patients)

33
Q

subacute sclerosis panencephalitis

A

acute encephalitis secondary to measles; causes personality changes, myoclonic jerks, recurrent falls, rigidity – death within 3 years

34
Q

JC virus

A

polyoma virus, 90% sero+ by middle age, causes PML in immunocompromised due to reactivation

35
Q

PML

A

cytolytic replication of JC polyomavirus in oligodendrocytes of brain (demyelinating) – focal motor and sensory deficits, gait abnormalities, speech, HA, visual impairment

36
Q

how do you dx PML?

A

brain biopsy (invasive), JC DNA in CSF, MRI shows lesions in white matter

37
Q

spongiform encephalopathy

A

prion disease: Kuru, Creutzfelt-Jakob disease; prions cause protein aggregation and fibril formation