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What is herpes simplex encephalitis?

Although rarely occurring, herpes simplex encephalitis is a neurological condition with a high death rate and morbidity rate. It is caused by herpes simplex virus and manifests as fever, hyperactivity, drowsiness, and/or general weakness.

What are its main signs and symptoms?

  • Early symptoms include:
    • Headache
    • Fever
    • Seizures
    • Drowsiness with general weakness
    • Confusion
    • Disorientation
  • Late symptoms include:
    • Difficulty in communicating through speech or writing
    • Loss of sense of smell
    • Memory loss
    • Hyperactivity
    • Psychotic episodes
  • Additional severe symptoms include:

What are the main causes?

  • The most common cause of herpes simplex encephalitis is a herpes simplex virus type I infection.
  • Other uncommon causes include:
    • Herpes simplex virus type II infection (more common in the newborns).
    • Some of the symptoms of herpes simplex encephalitis may arise as a result of tissue degeneration associated with haemorrhagic necrosis (death of the tissue) in the brain.
    • Herpes simplex encephalitis occurs when an inactive, dormant herpes simplex virus lying in the nerve tissue becomes reactive as a result of stress or trauma. The latent virus has the potential to become reactive years after initial exposure to herpes simplex virus.

How is it diagnosed and treated?

Diagnosis of herpes simplex encephalitis is based on clinical examination and investigations.

Investigations include:

  • Blood test
  • Cerebrospinal fluid examination
  • Electroencephalogram
  • Magnetic resonance imaging (MRI)
  • Brain biopsy

Early treatment with antiviral medications has shown to be beneficial in recovering from herpes simplex encephalitis.

The doctor may prescribe a 14-day course of acyclovir tablets as needed.

Depending on the severity of the condition, the doctor may administer intravenous acyclovir.

Anticonvulsants will be necessary in the case of seizures associated with herpes simplex encephalitis.

Elevation of the head, mannitol or glycerol administration and hyperventilation may be advised in order to maintain a reduced arterial partial pressure of carbon dioxide.

  1. Medicines for Herpes Simplex Encephalitis (HSE)

Medicines for Herpes Simplex Encephalitis (HSE)

Medicines listed below are available for Herpes Simplex Encephalitis (HSE). Please note that you should not take any medicines without doctor consultation. Taking any medicine without doctor's consultation can cause serious problems.

Medicine NamePack SizePrice (Rs.)
HerpexHerpex 100 Mg Tablet64
Lysatone PlusLysatone Plus Syrup61
ClovirClovir 5% Ointment29
OpthovirOpthovir 3% Ointment36
SetuvirSetuvir 5% Cream28
ToxinexToxinex 3% Eye Ointment52
ViraVira Eye Ointment30
VirinoxVirinox 3% W/W Eye Ointment34
VirucidVirucid 3% Eye Ointment39
YavirYavir 3% Eye Ointment30
AcyclovirAcyclovir 5% W/W Eye Ointment53
ClovidermCloviderm 5% Ointment0
EyevirEyevir 3% Eye Ointment36
Primacort PlusPrimacort Plus 5% Cream52
LycypLycyp Syrup50
Peritol GPeritol G Drop12
Acicet TabletAcicet 200 Mg Tablet Dt39
AciherpinAciherpin 200 Mg Tablet45
AcivexAcivex 200 Mg Tablet Dt62
AxovirAxovir 250 Mg Injection224
Lovir (Eli Lilly)Lovir 400 Mg Tablet99
NeoclovirNeoclovir 250 Mg Injection174
TriclovirTriclovir 400 Mg Tablet96

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References

  1. National Organization for Rare Disorders. Encephalitis, Herpes Simplex. [Internet]
  2. Sköldenberg B. Herpes simplex encephalitis.. Scand J Infect Dis Suppl. 1996;100:8-13. PMID: 9163027
  3. P G E Kennedy, A Chaudhuri. Herpes simplex encephalitis . Neurology, Neurosergery and Psychiatry; [Internet]
  4. R Whitley. Diagnosis and Treatment of Herpes Simplex Encephalitis. Vol. 32:335-340 (Volume publication date February 1981); [Internet]
  5. Michael J. Bradshaw, Arun Venkatesan. Herpes Simplex Virus-1 Encephalitis in Adults: Pathophysiology, Diagnosis, and Management. Neurotherapeutics. 2016 Jul; 13(3): 493–508. PMID: 27106239
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