NEUROLOGY Flashcards
(326 cards)
what are the complications of bacterial meningitis?
- Sensorineural hearing loss (most common).
- Cerebral infarction.
- Seizures.
- Cognitive impairment.
- Motor deficits.
- Hydrocephalus.
what are the clinical features of bacterial meningitis?
- Headache.
- Neck stiffness.
- Fever.
- Altered consciousness.
- Vomiting.
- Confusion.
- Photophobia.
- Seizures.
- Petechial rash in meningococcal disease (red or purple non-blanching macules smaller than 2 mm)
- Haemorrhagic rash in meningococcal disease (blanching macules larger than 2mm) which is absent in early phase and indicative of progression.
- Kernig’s sign (unable to fully extend at knee when hip is flexed).
- Brudzinski’s sign (person’s knees and hips flex when neck is flexed).
- Children present with non-specific symptoms such as fever, vomiting, and irritability.
how should suspected meningococcal disease be managed pre-hospital?
- Arrange emergency medical transfer to hospital by telephoning 999.
- Give parenteral antibiotics (intravenous benzylpenicillin 1200 mg or cefotaxime 1g) when a non-blanching rash is present and meningococcal disease is suspected.
- Do not give parenteral antibiotic treatment when a non-blanching rash is absent and suspected bacterial meningitis is suspected.
what investigations should be performed in suspected bacterial meningitis?
- blood cultures
- CT head
- lumbar puncture
what are the CSF features of bacterial meningitis?
- Opening CSF pressure: Raised.
- Appearance: Turbid; Cloudy; Purulent.
- WCC: Raised; Predominantly neutrophils.
- CSF protein: Raised.
- CSF glucose: Very low.
what are the contraindications to lumbar puncture in bacterial meningitis?
- meningococcal meningitis diagnosed clinically
- space occupying lesion on CT
- signs of raised ICP
- local infection
- coagulation abnormalities
- respiratory insufficiency
how is bacterial meningitis managed?
- IV dexamethasone
- IV ceftriaxone in adults and children older than 3 months
- IV cefotaxime and amoxicillin in children under 3 months
what are the clinical features of viral meningitis?
- Headache.
- Nausea and vomiting.
- Photophobia.
- Neck stiffness.
- Fever.
- Rash (maculopapular rash with echovirus-9).
- Kernig’s sing.
- Brudzinski’s sing.
what are the CSF features of viral meningitis?
- Opening pressure: Normal.
- Appearance: Clear.
- CSF WBC: Elevated; Predominantly lymphocytes.
- CSF protein: Normal may be elevated.
- CSF glucose: Normal may be low.
how is viral meningitis managed?
- Offer empirical antibiotic therapy and dexamethasone for acute ill patients as the presentation may be indistinguishable from that of acute bacterial meningitis.
- Offer supportive care (hydration, antipyretics, anti-emetics, analgesia) for confirmed enterovirus infection.
- Offer aciclovir plus supportive care for confirmed HSV or varicella zoster infection.
- Offer ganciclovir plus supportive care
what are the clinical features of fungal meningitis?
- Progressive headache over several weeks.
- Severe headache.
- Nuchal rigidity (impaired neck flexion).
- Photophobia.
- Reduced visual acuity and papilloedema.
what are the CSF features of fungal meningitis?
- CSF opening pressure = raised.
- CSF appearance = Clear or cloudy.
- CSF WCC = Raised; Predominantly lymphocytes.
- CSF protein = Raised.
- CSF glucose = Low.
how is fungal meningitis managed?
- Offer induction combination therapy (amphotericin B and flucytosine) for 2 weeks.
- Offer immediate initiation of antiretroviral therapy inpatients with HIV
- Consider ventriculoperitoneal shunt if CSF opening pressure exceeds 20 cm H2O.
- Offer consolidation therapy (fluconazole) for 8 weeks to prevent relapse.
- Offer long-term maintenance therapy (fluconazole) for 1 year for HIV-associated cryptococcal meningitis following consolidation therapy.
what are the clinical features of tuberculous meningitis?
- Vague headache.
- Neck stiffness.
- Vomiting.
- Drowsiness.
- Focal signs (diplopia, papilloedema, hemiparesis).
- Seizures.
what are the CSF features of tuberculous meningitis?
- CSF opening pressure = Raised.
- Appearance: Clear or cloudy.
- CSF ECC: Raised; Predominantly lymphocytes.
- CSF protein: Markedly raised.
- CSF glucose : Very low.
how is tuberculous meningitis managed?
- Offer treatment with antituberculosis drugs (rifampicin, isoniazid and pyrazinamide) for 10 months. Ethambutol should be avoided because of the eye complications.
- Offer adjunct corticosteroids (prednisolone 60 mg) for 3 weeks.
what is encephalitis?
inflammation of the brain parenchyma
what are the risk factors for encephalitis?
- Age <1 or >65
- Immunodeficiency
- Post-infection
- Exposure to blood or bodily fluid
- Organ transplant
- Animal or insect bites
- Location
- Season
- Swimming or diving in warm freshwater or nasal/sinus irrigation
what are the clinical features of encephalitis?
- Fever
- Rash
- Altered mental state
- Focal neurological deficit
- Meningismus
- Parotitis in mumps
- Lymphadenopathy
- Optic neuritis
- Acute flaccid paralysis
- Movement disorder
how is encephalitis managed?
- Give acyclovir and supportive care if viral aetiology is suspected in an immunocompetent patient
- If the patient is immunocompromised, give ganciclovir, foscarnet and acyclovir
how is non-viral encephalitis managed?
- Add immune-modulating therapy with methylprednisolone, IV immunoglobulin or plasma exchange in autoimmune, ADEM and paraneoplastic encephalitis
- Add benzylpenicillin if confirmed syphilis encephalitis
- Add ampicillin and gentamicin if listeria
- Add doxycycline or erythromycin with immune modulation if mycoplasma
- Add doxycycline if confirmed rocky mountain spotted fever encephalitis
what are the risk factors for neurocysticercosis?
- Living on a farm
- Poor hygiene
- Eating or handling undercooked meat, fish or crustaceans
- Ingestion of contaminated water
- Dog owners
- Children
what are the clinical features of neurocysticercosis?
- Visible worm segments in stool
- Features of raised intracranial pressure and seizures
- Hepatomegaly
- Cough with haemoptysis
- Anaemia
- Allergy symptoms due to lesional rupture
- Headaches and visual disturbances
how is neurocysticercosis diagnosed?
- Perform a stool examination: eggs and proglottids in stool
- Perform an enzyme-linked immunoelectrotransfer blot: Taenia solium with purified glycoprotein antigens
- Perform CT head: Brain calcification
- Perform MRI brain: extraparenchymal cysticerci tapeworm scolex and ring enhancing lesions