Zoster oticus (Ramsay Hunt syndrome)

What is Zoster oticus (Ramsay Hunt syndrome)?

Zoster oticus, also known as Ramsay Hunt syndrome (RHS), is a neurological disorder caused by the reactivation of the varicella‑zoster virus (VZV) in the facial nerve (cranial nerve VII) near the inner ear. The virus is the same one that produces chickenpox and later, shingles. When it reawakens in the facial nerve’s geniculate ganglion, it can inflame the nerve, producing a painful rash around the ear and a combination of facial paralysis, hearing loss, and vertigo. RHS accounts for roughly 12 % of all facial palsy cases and is considered a medical emergency because prompt treatment dramatically improves the chance of full recovery.¹

Common Causes

The condition itself is caused by VZV reactivation, but several factors increase the risk of that reactivation or exacerbate its impact:

• Previous varicella (chickenpox) infection: Almost everyone born before the varicella vaccine era carries latent VZV in nerve tissue.
• Advanced age: Immunity wanes after age 50, raising reactivation risk.
• Immunosuppression: HIV/AIDS, chemotherapy, organ transplantation, or long‑term steroids.
• Stress or severe illness: Physical or emotional stress can trigger viral reactivation.
• Chronic diseases: Diabetes mellitus, chronic kidney disease, and lung disease impair immune surveillance.
• Vaccination status: Lack of shingles (herpes zoster) vaccine in eligible adults.
• Trauma to the ear or facial nerve: Surgery or injury near the temporal bone may reactivate latent virus.
• Other viral infections: Co‑infection with herpes simplex virus (HSV) may potentiate nerve inflammation.
• Smoking: Nicotine reduces cellular immunity and has been linked with higher shingles rates.
• Genetic susceptibility: Certain HLA types appear more prone to VZV reactivation, though research is ongoing.

Associated Symptoms

RHS is a constellation of ENT, neurological, and dermatologic findings. The classic triad includes:

• Peripheral facial paralysis on the same side as the ear involvement.
• Painful vesicular rash (clusters of tiny blisters) on the external ear, auditory canal, or mouth.
• Hearing changes – ranging from muffled hearing to sudden sensorineural hearing loss.

Additional symptoms that frequently accompany the triad are:

• Tinnitus (ringing in the ear).
• Vertigo or imbalance.
• Ear fullness or pressure.
• Dry mouth and loss of taste on the affected side (due to chorda tympani involvement).
• Difficulty closing the eye, leading to dryness or corneal irritation.
• Neck pain and headache.
• Double vision if ocular muscles are affected.
• Rarely, facial nerve involvement can spread to the trigeminal or vestibulocochlear nerves, causing facial numbness or more profound balance problems.

When to See a Doctor

Because facial nerve damage can become permanent, timely medical evaluation is crucial. Seek care promptly if you notice any of the following:

• Sudden facial weakness or drooping on one side of the face.
• Painful, fluid‑filled blisters around the ear, in the ear canal, or on the tongue/roof of the mouth.
• Rapidly worsening hearing loss or ringing in the ear.
• Severe vertigo that interferes with standing or walking.
• Inability to close the eye on the affected side.
• Persistent ear pain that does not improve with over‑the‑counter analgesics.

Even if the rash is mild, the presence of facial paralysis warrants urgent evaluation. Early antiviral and steroid therapy within 72 hours of symptom onset provides the best outcomes.²

Diagnosis

Diagnosis is primarily clinical, but several tests help confirm the condition and assess complications:

1. History & Physical Examination

• Detailed symptom timeline (onset of pain, rash, weakness).
• Inspection of the ear and oral cavity for vesicles.
• Neurologic exam focusing on facial nerve grades (House‑Brackmann scale).
• Assessment of hearing (finger rub, whisper test) and balance.

2. Otoscopic & Audiologic Testing

• Otoscopic exam identifies vesicles in the external auditory canal.
• Pure‑tone audiometry quantifies hearing loss.
• Speech‑in‑noise testing evaluates functional hearing.

3. Laboratory Tests

• Polymerase chain reaction (PCR) of vesicular fluid for VZV DNA – highly specific.
• Serologic VZV IgM/IgG if PCR is unavailable.

4. Imaging

• High‑resolution MRI with gadolinium can show enhancement of the facial nerve and rule out alternative causes such as tumors or stroke.
• CT of the temporal bone may be ordered if there is suspicion of bony erosion.

5. Additional Tests for Complications

• Electro‑diagnostic studies (electroneuronography, EMG) to gauge nerve degeneration if recovery is delayed.
• Balance testing (videonystagmography) when vertigo persists.

Treatment Options

Management focuses on three goals: halt viral replication, reduce inflammation, and protect the eye.

Medical Therapies

• Antiviral agents: Oral acyclovir (800 mg five times daily), valacyclovir (1 g three times daily), or famciclovir (500 mg three times daily) for 7‑10 days. Intravenous acyclovir is reserved for severe cases or immunocompromised patients.³
• Corticosteroids: Prednisone 60‑80 mg daily for 5‑7 days followed by a taper reduces nerve swelling and improves facial‑muscle recovery. Start within 72 hours of symptom onset.
• Pain control: NSAIDs (ibuprofen or naproxen) for mild pain; gabapentin or pregabalin for neuropathic pain; short‑acting opioids only if needed.
• Eye protection: Artificial tears during the day, lubricating ointment at night, and an eye patch or taping to keep the eyelid closed.
• Adjuncts: Antiemetics for vertigo, antihistamines for nausea, and a short course of anti‑vertigo medication (meclizine) if dizziness is severe.

Rehabilitation & Home Care

• Facial‑muscle exercises: Gentle massage and targeted movements (e.g., raising eyebrows, smiling) three times daily to prevent muscle atrophy.
• Physical therapy: A therapist experienced in facial nerve rehab can teach biofeedback and electrical stimulation techniques.
• Hearing rehabilitation: If hearing loss persists, consider a hearing aid or, in severe sudden loss, cochlear implantation after otolaryngology evaluation.
• Balance training: Vestibular rehabilitation exercises (gaze stability, habituation) aid recovery from vertigo.
• Nutrition & hydration: Soft foods and adequate fluids if swallowing is affected.

When Hospitalization May Be Needed

• Severe immunosuppression.
• Rapidly progressive hearing loss or vestibular dysfunction.
• Inability to protect the eye despite conservative measures.
• Complications such as secondary bacterial otitis media.

Prevention Tips

Because RHS stems from VZV reactivation, primary prevention targets shingles risk:

• Shingles vaccine: The recombinant zoster vaccine (Shingrix) is >90 % effective and is recommended for adults ≥ 50 years or earlier for immunocompromised patients.
• Maintain a healthy immune system: Balanced diet, regular exercise, adequate sleep, and stress‑management techniques.
• Control chronic diseases: Keep diabetes, hypertension, and lung disease well‑managed.
• Avoid smoking and excessive alcohol: Both impair immune function.
• Prompt treatment of chickenpox in children: While most children recover, early antiviral therapy in high‑risk cases may reduce latency load.
• Hand hygiene: Reduces spread of VZV to susceptible contacts, especially important in households with infants or immunocompromised members.

Emergency Warning Signs

Key Take‑aways

• Ramsay Hunt syndrome is a medical emergency caused by VZV reactivation in the facial nerve.
• Early antiviral plus steroid therapy (within 72 hours) dramatically improves facial‑nerve and hearing outcomes.
• Protecting the eye, rehabilitating facial muscles, and addressing balance/hearing deficits are essential parts of recovery.
• Vaccination against shingles is the most effective preventive measure.
• Seek immediate care for any rapid change in facial function, hearing, or balance.

References:

1. Mayo Clinic. “Ramsay Hunt syndrome.” Updated 2023. https://www.mayoclinic.org.
2. American Academy of Otolaryngology‑Head and Neck Surgery. “Clinical practice guideline: Facial nerve paralysis.” 2022.
3. CDC. “Shingles (Herpes Zoster) Vaccination.” 2024. https://www.cdc.gov.
4. Cleveland Clinic. “Ramsay Hunt Syndrome (Herpes Zoster Oticus).” 2023.
5. NIH National Institute on Deafness and Other Communication Disorders. “Facial nerve disorders.” 2022.