Management of Meningitis
What is Meningitis?
Meningitis is an acute or chronic inflammation of the meninges, the three membranes that envelop the brain and spinal cord (dura mater, arachnoid mater, pia mater). It is most often of infectious origin (bacterial, viral, tuberculous, fungal, parasitic), but can also be non-infectious (carcinomatous, drug-induced, autoimmune).
Meningitis is an absolute medical emergency, particularly bacterial meningitis, which is life-threatening within hours and can leave severe neurological sequelae if treatment is delayed.
Types of Meningitis
- Bacterial meningitis (purulent): the most severe, high mortality (10-30% even with treatment). Common pathogens: Neisseria meningitidis (meningococcus), Streptococcus pneumoniae (pneumococcus), Haemophilus influenzae type b, Listeria monocytogenes (elderly, immunocompromised, newborns), Streptococcus agalactiae (newborns), Escherichia coli (newborns).
- Viral meningitis (lymphocytic): more common, generally less severe, usual spontaneous recovery. Viruses: enteroviruses (Coxsackie, Echo), Herpes simplex virus (HSV-2 mainly), varicella-zoster, mumps, HIV, CMV, EBV, arboviruses.
- Tuberculous meningitis: caused by Mycobacterium tuberculosis, subacute course (2-4 weeks), severe if diagnosed late.
- Fungal meningitis: rare, occurs in immunocompromised hosts (HIV, transplant patients, corticosteroids). Pathogens: Cryptococcus neoformans, Candida, Aspergillus, Histoplasma.
- Carcinomatous meningitis: meningeal infiltration by cancer cells (leukemias, lymphomas, breast, lung cancer, melanoma).
What are the signs of Meningitis? (Symptoms)
Symptoms of meningitis vary according to age and pathogen, but classic signs include:
Classic Meningeal Triad (Adult)
- Intense headaches: often diffuse, severe, not relieved by usual analgesics, sometimes retro-orbital.
- High fever (> 38.5-39°C) or hypothermia (severe forms).
- Neck stiffness (meningismus): inability to touch the sternum with the chin, resistance to passive neck flexion. Kernig's sign (inability to extend the leg when the thigh is flexed at 90°) and Brudzinski's sign (spontaneous flexion of the legs during neck flexion).
Other Neurological Signs
- Altered consciousness: confusion, drowsiness, agitation, coma (sign of severity).
- Photophobia (intolerance to light).
- Nausea, vomiting (often projectile).
- Seizures (generalized or focal).
- Focal neurological signs (motor deficit, speech disorder, oculomotor palsy – sign of associated parenchymal involvement, meningoencephalitis).
- Purpura (reddish-purple spots): suggestive of meningococcal meningitis (purpura fulminans, absolute emergency).
- Bulging fontanelle in infants (major sign).
- Irritability, whining, refusal to feed in infants.
Signs of Severity (Life-threatening Emergency)
- Purpura fulminans (rapid spread of spots, sign of disseminated intravascular coagulation).
- Coma (Glasgow Coma Scale ≤ 8).
- Repeated seizures (status epilepticus).
- Septic shock (hypotension, tachycardia, mottling).
- Cerebral edema with signs of herniation (miosis, bradycardia, hypertension, respiratory distress).
How is Meningitis Diagnosed in Tunisia?
Diagnosis is based on lumbar puncture (LP), the gold standard, after ruling out contraindications (brain CT scan).
Pre-Lumbar Puncture Examinations
- Brain CT scan (without contrast): essential before LP if there are signs of focalization, decreased consciousness, seizures, immunodepression, age > 60, history of CNS disease, to rule out cerebral abscess, subdural hematoma, tumor, or cerebral edema (risk of herniation during LP).
- Pre-LP biological workup: CBC, platelets, PT/PTT (coagulation), blood glucose, creatinine, electrolytes, CRP, procalcitonin, blood cultures (2 pairs before antibiotics).
Lumbar Puncture (LP) – Cerebrospinal Fluid (CSF) Analysis
Performed in lateral or sitting position, between L3-L4 or L4-L5, after local anesthesia. Routine examinations:
- Macroscopic appearance:
- Normal: clear (crystal clear).
- Turbid, purulent, cloudy: bacterial meningitis.
- Xanthochromic (yellowish): subarachnoid hemorrhage, tuberculous meningitis.
- Hemorrhagic: subarachnoid hemorrhage (traumatic tap if gradient in tubes 1-2-3).
- Biochemistry:
- Protein (proteinorrhachia): normal < 0.45 g/L. Elevated in bacterial (1-5 g/L, sometimes > 10 g/L), tuberculous, and fungal meningitis.
- Glucose (CSF glucose / blood glucose ratio): normal = 0.5-0.66. Decreased (< 0.3-0.4) in bacterial, tuberculous, fungal, carcinomatous meningitis. Normal (> 0.5) in viral meningitis.
- Cytology (leukocyte count):
- Normal: < 5 leukocytes/mm³.
- Bacterial meningitis: pleocytosis > 100-1000/mm³ (often > 1000), polymorphonuclear neutrophils > 80-90%.
- Viral meningitis: moderate pleocytosis (10-500/mm³), lymphocytes > 80%.
- Tuberculous/fungal meningitis: mixed pleocytosis (100-500/mm³), often lymphocytes, sometimes neutrophils at onset.
- Bacteriology:
- Direct examination (Gram stain): looks for bacteria (meningococcus, pneumococcus, bacilli). Rapid (30 min).
- Culture (inoculation on blood agar, chocolate agar, Sabouraud): gold standard. Delay: 24-72h.
- Antibiogram: to guide treatment after isolation.
- Virology:
- PCR (Polymerase Chain Reaction): Herpes simplex (HSV-1, HSV-2), varicella-zoster (VZV), enteroviruses, CMV, EBV, HIV. Result in 2-24h.
- Serologies (CSF and blood).
- Tuberculosis:
- Acid-fast bacilli (AFB) smear (low sensitivity).
- Mycobacterial culture (delay 3-6 weeks).
- Tuberculosis PCR (GeneXpert MTB/RIF) (delay 2h).
- Adenosine deaminase (ADA) assay: elevated (> 8-10 IU/L) suggestive.
- Fungal:
- India ink smear (Cryptococcus).
- Cryptococcal antigen (latex): very sensitive, rapid detection.
- Fungal culture on Sabouraud.
Other Complementary Examinations
- Brain MRI (with gadolinium): looks for complications (abscess, meningoencephalitis, cerebral thrombophlebitis, hydrocephalus, subdural empyema).
- EEG (electroencephalogram): if suspected non-convulsive seizures or encephalitis.
- Blood cultures: systematic (2 pairs), positive in 50-70% of bacterial meningitis before antibiotics.
How is Meningitis Managed in Tunisia?
Meningitis is an absolute emergency. Antibiotic therapy must be initiated within one hour of clinical suspicion, without waiting for LP results (unless there is a formal contraindication to LP, in which case empirical antibiotics are given immediately).
Probabilistic Treatment (Before Pathogen Identification)
Suspected bacterial meningitis (adult and child > 3 months)
- Standard protocol (recommendations): Cefotaxime (200-300 mg/kg/day IV in 4-6 doses) or Ceftriaxone (50-100 mg/kg/day IV 1-2 times/day) + Vancomycin (15-20 mg/kg IV every 8-12h, after loading dose 15-20 mg/kg) (covers pneumococcus with reduced susceptibility to cephalosporins).
- Alternative: Meropenem (40 mg/kg/day IV 3 times/day) (if severe β-lactam allergy).
- Add Ampicillin (200 mg/kg/day IV in 4-6 doses) for patients who are elderly, immunocompromised, pregnant (covers Listeria monocytogenes), or neonates (< 3 months).
- Corticosteroids (dexamethasone): 0.15-0.2 mg/kg IV every 6h for 2-4 days, started before or simultaneously with the first dose of antibiotics (reduces inflammatory response, decreases neurological sequelae and mortality). Indicated for bacterial meningitis (all ages), especially pneumococcal. Contraindicated if tuberculous meningitis (risk of spread) and if LP performed > 4h after antibiotics (less beneficial).
Suspected viral meningitis (negative PCR, viral context)
- Acyclovir (10 mg/kg IV every 8h) while awaiting PCR to cover HSV and VZV, especially if associated encephalitis (confusion, seizures, focal signs).
- Symptomatic treatment: analgesics (paracetamol), antiemetics, hydration, rest.
Suspected tuberculous meningitis (subacute, at-risk population)
- Quadruple therapy: Isoniazid (INH), Rifampicin (RMP), Pyrazinamide (PZA), Ethambutol (EMB) (or streptomycin if < 5 years).
- Corticosteroids (dexamethasone or prednisone): systematic – reduces mortality and sequelae.
- Duration: 12 months.
Management of Complications and Intensive Care
- ICU admission for coma, repeated seizures, purpura fulminans, septic shock, respiratory distress, cerebral edema, acute kidney injury.
- Enhanced neurological monitoring: hourly Glasgow, signs of herniation, pupil size, brainstem reflexes.
- Treatment of cerebral edema: mannitol (20%), hypertonic saline, moderate hyperventilation.
- Hydrocephalus: external ventricular drain (EVD) or ventriculoperitoneal shunt (VPS).
- Subdural empyema or cerebral abscess: neurosurgical drainage plus prolonged antibiotics.
Prophylaxis for Close Contacts (Meningococcal Meningitis)
- People concerned: close contacts (< 1m) within 7 days before symptoms (household, school, daycare, healthcare workers exposed without mask).
- Chemoprophylaxis within 24-48h of diagnosis: rifampicin, ceftriaxone, or ciprofloxacin.
- Vaccination: quadrivalent meningococcal vaccine (ACYW135) or vaccine B according to epidemiology.
What are the Risks and Complications of Meningitis?
- Neurological complications: focal deficit, sensorineural hearing loss, encephalopathy, epilepsy, hydrocephalus, subdural empyema, cerebral abscess, cerebral thrombophlebitis, persistent vegetative state.
- Systemic complications: septic shock (purpura fulminans), DIC, multiorgan failure (MODS), extremity amputation, nosocomial infection.
Prognosis of Meningitis
Hospital mortality is 10-30% (bacterial meningitis). Unfavorable prognostic factors include pneumococcal origin, extremes of age, coma on admission, septic shock, and delayed treatment.
What to Do After Meningitis? Rehabilitation and Follow-up
- Physical therapy: motor rehabilitation for deficits.
- Speech therapy: language and cognitive rehabilitation, swallowing.
- Neuropsychology: cognitive and behavioral management.
- Audiology: hearing screening and potential cochlear implants.
- Follow-up imaging: brain MRI at 3-6 months, EEG if epilepsy.
- Post-meningitis vaccination: pneumococcal or meningococcal vaccines as indicated.
Why Choose Tunisia for Meningitis Management?
Tunisia has high-level neurologists, infectious disease specialists, intensivists, and neurosurgeons, trained in the best European centers. Emergency and intensive care services are modern with 24/7 CT scan, MRI, rapid PCR (2-8h), ultrasound-guided lumbar puncture, ICP monitoring, and neurosurgery.
Advantages of Tunisia:
- Rapid diagnosis: Brain CT scan within < 1h, lumbar puncture within 2-4h of admission, results in 1-2h, PCR in 2-24h.
- Early antibiotic therapy: first dose within one hour of clinical suspicion.
- Complete technical platform: CT, 1.5T/3T MRI, EEG, 24/7 bacteriology/virology/mycobacteriology lab, neuro-ICU, ICP monitoring.
- Compliance with international guidelines: protocolized treatment (antibiotics, dexamethasone), management of complications.
- All-inclusive packages: diagnostic and therapeutic packages available in some private clinics.
- Management of foreign patients: simplified administrative procedures, coordination with international insurance companies, multilingual reception (French, English, Arabic, Italian).