Infections of the Nervous System Flashcards
What is meningitis?
Inflammation and infection of meninges
What are the common symptoms of meningitis?
Headache Fever Neck stiffness Altered mental state Photophobia Nausea/ vomiting Seizures Petechial skin rash
What are the bacterial causes of meningitis?
Meningococcus
Pneumococcus
What is the viral cause of meningitis?
Enterovirus
What is encephalitis?
Inflammation and infection of brain substances
What are the clinical symptoms of encephalitis?
Progressive headache Meningism Confusion Abnormal behaviour Memory disturbance Depressed conscious level Seizures
What are the investigations for meningitis?
Blood cultures
Lumbar puncture
What are the investigations for encephalitis?
Blood cultures
CT/MRI
Lumbar puncture
EEG
What are the antibodies associated with auto-immune encephalitis?
Anti-voltage gated potassium channel
Anti-NMDA
What are the CSF findings for bacterial meningitis?
Opening pressure increased
High cell count, mainly neutrophils
Glucose reduced or zero
High protein
What are the csf findings for viral meningitis or encephalitis?
Opening pressure normal or increased
Cell count high, mainly lymphocytes
Glucose normal
Protein slightly increased
What is the specific investigation for herpes simplex encephalitis?
Lab diagnosis by PCR of CSF for viral DNA
What is the treatment for herpes simplex encephalitis?
Aciclovir
Where is the herpes simplex virus found latent after primary infection?
Trigeminal and sacral ganglion
What is the significance of arbovirus encephalitides?
Relevant to travel history, common in sub/tropics