Facial Paralysis and Bell's Palsy: Diagnosis, Early Steroid Therapy and Recovery

The facial nerve (CN VII) arises from its brainstem nucleus, exits in the pons, enters the temporal bone via the internal auditory canal and Fallopian canal, exits at the stylomastoid foramen, and divides into five main branches (temporal, zygomatic, buccal, marginal mandibular, cervical) within the parotid gland. This long, bony, narrow course (particularly the labyrinthine segment) makes the nerve vulnerable to compression from any swelling or inflammation.

Peripheral (lower motor neuron) palsy affects the entire half of the face: forehead creases disappear, the eyebrow cannot be raised, the eye does not fully close (lagophthalmos), the nasolabial fold flattens, and the corner of the mouth droops. The nucleus or peripheral course is damaged — Bell's palsy is the classic example.

Central (upper motor neuron) palsy preserves forehead movement because the forehead muscles receive corticobulbar input from both hemispheres. It suggests stroke or brain tumour. The lower face is affected while the forehead is spared. This distinction is made on history and examination; suspected central lesions demand urgent neurology and imaging.

The House-Brackmann scale (HB) is the standard for clinical grading: I (normal), II (mild dysfunction), III (moderate), IV (moderate-severe), V (severe), VI (total paralysis). Used for treatment planning, prognosis and follow-up. We expand on the clinical framework in our otology and hearing centre.

Definition of Bell's palsy: acute, unilateral, peripheral facial paralysis without any other identifiable cause. "Idiopathic" by definition — pathophysiology has become clearer.

Herpes simplex virus type 1 (HSV-1) reactivation is the most accepted theory. The virus lies latent in the geniculate ganglion; reactivation causes perineural inflammation, oedema and compression in the labyrinthine segment. Supported by autopsy and PCR studies.

Risk factors: pregnancy (especially third trimester and early postpartum — risk tripled), diabetes (4-5-fold), hypertension, obesity, autoimmune diseases, family history, cold exposure (AC draught, open car window), after URI, tension/stress.

Annual incidence: 15-30 per 100,000. All ages, peaking at 15-45 years. Equal sex ratio overall; female preponderance during pregnancy. 8-10% of patients have a history of recurrence; 2% are bilateral simultaneously or sequentially.

Differential diagnosis (critical): Ramsay Hunt syndrome (herpes zoster oticus — vesicles around the ear, pain, vertigo + paralysis — antivirals required), Lyme disease (endemic area), acoustic neuroma (slowly progressive unilateral), parotid tumour, otitis complication (acute or chronic with cholesteatoma), trauma (temporal bone fracture), cerebellopontine angle tumours, multiple sclerosis, sarcoidosis, lymphoma, HIV.

Bell's palsy diagnosis is essentially clinical — exclusion of other reasonable causes. A careful history is critical: onset speed (Bell typically peaks within 72 hours; slowly progressive unilateral paralysis suggests tumour), associated symptoms (ear pain, vesicles, hearing loss, vertigo — Ramsay Hunt; fever, joint pain, tick bite — Lyme), trauma history.

Examination: peripheral or central (forehead movement), complete or partial (HB grade), ear examination (otoscopy — vesicles, otitis, cholesteatoma, perforation), parotid palpation (mass?), cervical lymph nodes, dermatomal examination (zoster vesicles?), neurological exam (other cranial nerves — especially V and VIII; cerebellar function).

Imaging: not routine in typical Bell's palsy. MRI indications: slow onset (>3 weeks), failure to recover or no improvement after 3 weeks, ongoing progression, additional cranial nerve signs, periauricular mass, dominant ear pain, atypical features. Temporal bone CT for suspected trauma, otitis-associated paralysis, suspected cholesteatoma.

Laboratory: not routine; Lyme serology in endemic areas, ANA in clinical suspicion, ACE for sarcoidosis, HIV testing in selected cases. In pregnancy, screen for glucose, blood pressure and pregnancy complications.

Electrophysiologic tests: electroneurography (ENoG) within the first 14 days is valuable — >90% degeneration predicts poor prognosis. EMG after 14 days for reinnervation signs. Used for prognosis; does not change initial treatment. More detail: cholesteatoma page.

Corticosteroid: starting within 72 hours is the gold standard. Prednisolone 60-80 mg/day (or prednisone 1 mg/kg/day, max 80 mg) for 5-7 days, then 4-5 days rapid taper — total 10 days. Cochrane meta-analysis: full recovery 85% on treatment vs 72% without; relative risk increase 15-20%.

Cautions/contraindications: uncontrolled diabetes, active peptic ulcer, severe infection, pregnancy (balance risks — usually recommended, sometimes at reduced dose), prior psychiatric disturbance. Gastric protection (PPI) and glucose monitoring in diabetics.

Antiviral: not effective alone. In severe Bell's (HB V-VI) or Ramsay Hunt suspicion, combine with steroid: valaciclovir 1000 mg three times daily for 7 days, or aciclovir 400 mg five times daily for 10 days. In Ramsay Hunt, antiviral is mandatory — delay worsens prognosis.

Eye protection — THE most critical element: artificial tears (hyaluronic acid, carboxymethylcellulose) every 1-2 hours, ophthalmic ointment (Lacri-Lube or similar) at night + eyelid closure (goggles, transparent tape). Corneal abrasion, exposure keratitis, ulceration and perforation are possible. With significant lagophthalmos, ophthalmology consultation; temporary tarsorrhaphy considered.

Physiotherapy and neuromuscular re-education: starting in the first week is optimal. Mirror exercises, biofeedback, massage. Electrical stimulation benefit is debated (may increase synkinesis in some studies). Controlled exercises preferred to prevent synkinesis.

Surgical decompression: opening the narrow (labyrinthine) segment of the facial nerve in the temporal bone. Efficacy debated; possibly beneficial in ENoG-confirmed >90% degeneration with complete clinical palsy (HB VI) within 14 days. Not routine.

Typical recovery timeline: 85% show meaningful improvement within 3 weeks; 70-85% achieve complete or near-complete recovery in 3-6 months. Total paralysis (HB VI) has worse prognosis — 50-60% full recovery. If recovery is delayed or incomplete, intensify physiotherapy at 4-6 months.

Sequelae: residual weakness (mild facial asymmetry), synkinesis (involuntary coupled movement — e.g. eye closure triggers mouth movement), crocodile-tear syndrome (lacrimation when eating — due to aberrant parasympathetic regeneration), hemifacial spasm, contracture.

Synkinesis treatment: specialised physiotherapy (neuromuscular re-education), biofeedback, botulinum toxin (low dose to involved muscles every 6 months), selective denervation surgery in some cases.

Crocodile tears: sometimes self-limited. Persistent cases benefit from low-dose botulinum toxin to the lacrimal gland.

Late or HB IV-VI residual paralysis: static suspensions (fascial slings), dynamic reanimation (free gracilis transfer, masseter-to-facial nerve transfer), eyelid gold-weight implant for closure. Performed at plastic surgery or ENT reanimation centres.

Psychosocial impact: facial palsy affects self-esteem, social interaction and mental health. Patient education, support, and psychological help when needed are important. We share patient experiences on our patient testimonials.