eMedicine Specialties > Emergency Medicine > Infectious Diseases
Herpes Zoster Oticus
Updated: Nov 4, 2008
Introduction
Background
Herpes zoster oticus (HZ oticus) is a viral infection of the inner, middle, and external ear. HZ oticus manifests as severe otalgia and associated cutaneous vesicular eruption, usually of the external canal and pinna. When associated with facial paralysis, the infection is called Ramsay Hunt syndrome.
Pathophysiology
Reactivation of the varicella-zoster virus (VZV) along the distribution of the sensory nerves innervating the ear, which usually includes the geniculate ganglion, is responsible for HZ oticus. Associated symptoms such as hearing loss and vertigo are thought to occur as a result of transmission of the virus via direct proximity of cranial nerve (CN) VIII to CN VII at the cerebellopontine angle or via vasa vasorum that travel from CN VII to other nearby cranial nerves.
Frequency
United States
Ramsey Hunt syndrome accounts for up to 12% of all facial paralyses.
Mortality/Morbidity
Ramsay Hunt syndrome generally causes more severe symptoms and has a worse prognosis than Bell palsy.
- Return-to-baseline neurologic function is predicted partially by severity of paralysis.
- In several studies, only 10-22% of individuals with significant facial paralysis had complete recovery. In one study, however, 66% of patients with incomplete paralysis had complete recovery.
- An additional complication of herpes zoster viral infection is postherpetic neuralgia.
Sex
Incidence in males and females is equal.
Age
Incidence of HZ oticus increases significantly in patients older than 60 years.
Clinical
History
- Typically, patients present with severe otalgia. Complaints include the following:
- Painful, burning blisters in and around the ear, on the face, in the mouth, and/or on the tongue.
- Vertigo, nausea, vomiting
- Hearing loss, hyperacusis, tinnitus
- Eye pain, lacrimation
- Onset of pain may precede the rash by several hours or days. Also, in patients with Ramsay Hunt syndrome, vesicles may appear before, during, or after facial palsy (zoster sine herpete).
- When asked, patients may recall a distant history, perhaps in childhood, of chickenpox (varicella).
- A minority of patients (<10%) give a history of previous herpes zoster viral infection.
Physical
- Physical examination shows a vesicular exanthem, usually of the external auditory canal, concha, and pinna.
- The rash also may appear on postauricular skin, lateral nasal wall, soft palate, and anterolateral tongue.
- Vertigo and sensorineural hearing loss may be noted.
- Paralysis of the facial nerve, mimicking Bell palsy, may be present.
- Complete loss of the ability to wrinkle the ipsilateral brow distinguishes a peripheral lesion of cranial nerve VII from a central lesion of the same nerve, which spares the forehead.
- Associated findings
- Dysgeusia (alteration in taste)
- Inability to fully close the ipsilateral eye, which may lead to the occasional presentation of drying and irritation of the cornea.
Causes
Herpes zoster oticus is caused by the reactivation of latent VZV, which has remained dormant within sensory ganglia (commonly the geniculate ganglion) of the facial nerve.
- Individuals with decreased cell-mediated immunity resulting from carcinoma, radiation therapy, chemotherapy, or HIV infection are at greater risk for reactivation of latent VZV.
- Physical and emotional stress often are cited as precipitating factors.
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Overview: Herpes Zoster Oticus |
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References
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Uscategui T, Doree C, Chamberlain IJ, Burton MJ. Corticosteroids as adjuvant to antiviral treatment in Ramsay Hunt syndrome (herpes zoster oticus with facial palsy) in adults. Cochrane Database Syst Rev. Jul 16 2008;CD006852. [Medline].
Benson CA, Kaplan JE, Masur H. Treating opportunistic infections among HIV-exposed and infected children: recommendations from CDC, the National Institutes of Health, and the Infectious Diseases Society of America. MMWR Recomm Rep. Dec 17 2004;53(RR-15):1-112. [Medline].
Pavan-Langston D. Herpes zoster antivirals and pain management. Ophthalmology. Feb 2008;115(2 Suppl):S13-20. [Medline].
Harpaz R, Ortega-Sanchez IR, Seward JF. Prevention of herpes zoster: recommendations of the Advisory Committee on Immunization Practices (ACIP). MMWR Recomm Rep. Jun 6 2008;57:1-30; quiz CE2-4. [Medline].
Adour KK. Otological complications of herpes zoster. Ann Neurol. 1994;35 Suppl:S62-4. [Medline].
Bauer CA, Coker NJ. Update on facial nerve disorders. Otolaryngol Clin North Am. Jun 1996;29(3):445-54. [Medline].
Murakami S, Hato N, Horiuchi J. Treatment of Ramsay Hunt syndrome with acyclovir-prednisone: significance of early diagnosis and treatment. Ann Neurol. Mar 1997;41(3):353-7. [Medline].
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Further Reading
Keywords
herpes zoster oticus, HZ oticus, viral infection of the ear, Ramsay Hunt syndrome, facial paralysis, varicella-zoster virus, VZV, reactivation of varicella-zoster virus, reactivation of VZV, postherpetic neuralgia, otalgia, hearing loss, vertigo
Overview: Herpes Zoster Oticus