Aseptic meningitis

definition: When the CSF culture was negative.

CSF:

pressure mmh2o: normal or slightly elevated. leukocytes : PMN early mononuclear later.rarly >1000Protein mg /dl:20-100Glucose mg/dl: generally normal may be depressed to40. (15-20%) Entroviruse recoverd by CSF culture or PCRHSV by PCR.

CSF

Aseptic meningitis

Refer principally to viral meningitis.

Other infection.( Lyme disease,syphlis,TB)

Parameningeal infection:(brain abscess, epidural abscess,venus sinus empyema)

Chemical (NSAID,anti-inflamatory, IVig) Autoimmune disorders

Encephalitis

Inflammatory of brain parenchyma lead to cerebral dysfunction .

May be diffuse , or localized

1. Acute 2. Post infection encephalomyelitis3. Chronic degenerative ,slow viral infection.

Encephalitis

it has 2 mechanism.

1. Direct infection. 2. Immune mediated response in the CNS that begins

several days after the extraneural manifestation of infection .

Encephalitis

Viruses are the principal causes of acute infection encephlitis.

Metabolic. Toxic. Neoplastic disorder. HIV is an important cause of enceplalitis more

commonly insidious in onset.

ADEM ( Acute disseminated encephalomyelitis)

ADEM abrupt development. mutiple neurologic signs related to an inflammatory

and demyelinating disorder of brain and spinal cord .

Childhood viral infection. ( measles , chickenpox, or vaccination) Resembles to MS. Relapses occurred in 14% within in 1 year .

Clinical manifestation encephalitis

Prodrome of nonspecific symptoms.(cough, sore throat, fever, headache, abdominal

complaint)

Progressive lethargy, behavioral change, neurologic deficits.

Seizures are common. Maculopapular rash. Coma, transverse myelitis, Polio- like illness, periferal

neuropathy.

Laboratory

CSF shows:

lymphocytic pleocytosis.Slight elevatin protein.Normal glucose.The CSF occasionally may be normal. In HSV protein and RBC increased . Extreme elevated of protien and reduction of glucose(TB, carcinomatoseis, cryptococcal infection)

Laboratory

EEG: temporal lobe characteristic HSV

infection .

Serologic studies.(arbovirus, EBV, mycoplasma, cat-scratch, Lyme)

culture stool and CSF ,nasopharyngeal. PCR test for HSV,entrovirus and other virus. The cause of encephalitis In 1/3 of cases is

undetermined.

Laboratory

Brain biopsy may be necessary for definitive diagnosis.

1. in patients with focal neurologic finding2. Severe encephalopathy with no clinical improvement

if diagnosis is obscure.3. HSV,rabis encephalitis ,prion related disease (kuru,

jakob) diagnosed with culture of brain biopsy.4. Identify arbovirus, entrovirus, TB, fungal infection .5. Non infection illness ( primary CNS

vasculopathies ,malignancies)

Differential diagnosis

Diagnosis established with :

Neurologic signs. epidemiology, evidence of infection in CSF, EEG, brain imaging

brain biopsy diagnostic but seldom performed.

Treatment

There is no specific therapy exception of HSV and HIV. Treatment is supportive

(siezure, electerolyte abnormality, airway monitoring, increased ICP

ADEM:high-dose IV corticosteroids.

IV acyclovir is choice for HSV. M,pneumonia may be trated with doxycycline,

erythromycin, azithromycin, clarithromycin??

complication

Symptoms resolve over several days to 2-3 weeks. Recover without sequelae in 2/3 before dischrge from

hospital. neurologic sequelae(spasticity,cognitive impairment,

weakness, ataxia, seizure. ( gradually recover some or all) death. Mortality is 5%

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