A patient arrives with sudden-onset facial droop. The rookie fear? Stroke. But not every facial paralysis is a cerebrovascular event. Bell’s palsy, an acute idiopathic facial nerve palsy, is the most common cause — and one that rookies must confidently diagnose and treat without missing stroke.
What Is Bell’s Palsy?
- Acute, unilateral lower motor neuron (LMN) facial nerve paralysis.
- Onset: progressive over hours to days, not seconds.
- Likely viral or autoimmune inflammation of CN VII.
Step 1: Differentiate Bell’s Palsy From Stroke
Bell’s Palsy (LMN pattern)
- Involves entire half of face:
- Forehead (cannot raise eyebrows).
- Eye (cannot close fully, incomplete blink).
- Mouth droop.
- Evolves over hours–days.
- No other focal neuro deficits.
Stroke (UMN pattern)
- Spares the forehead (due to bilateral cortical innervation).
- Sudden onset (seconds–minutes).
- Often associated with limb weakness, speech changes, vision loss.
Rookie pearl: “Can they wrinkle their forehead?” If yes → stroke more likely.
Step 2: Key Clinical Features of Bell’s Palsy
- Sudden unilateral weakness of facial muscles.
- May have:
- Ear pain, hyperacusis.
- Altered taste, decreased lacrimation.
- Drooling, incomplete eyelid closure.
- No limb weakness, no aphasia, no altered consciousness.
Step 3: ED Workup
- Diagnosis is clinical in classic cases.
- No imaging needed unless atypical:
- Forehead sparing.
- Gradual onset over >2 weeks.
- Recurrent episodes, bilateral palsy.
- Additional neuro deficits.
- If atypical → CT/MRI to exclude stroke, mass, infection.
Step 4: ED Treatment
- Corticosteroids: Prednisone 60 mg PO daily × 7 days (start within 72 hrs).
- Antivirals: (acyclovir/valacyclovir) may be added in severe cases, though benefit modest.
- Eye protection:
- Artificial tears during day.
- Lubricating ointment + eye patch at night.
- Ophthalmology referral if corneal exposure severe.
- Analgesia for ear pain if present.
Step 5: Disposition
- Outpatient management in most cases.
- Follow-up in 1–2 weeks with primary care or neurology.
- Refer to ophthalmology if incomplete eye closure severe.
Prognosis
- 70–80% recover fully within weeks to months.
- Poor prognostic factors: complete paralysis at onset, age >60, diabetes, delayed treatment.
Common Rookie Mistakes
- Misdiagnosing stroke as Bell’s palsy → missing thrombolysis window.
- Forgetting steroids — strongest evidence for recovery.
- Not protecting the eye → corneal ulceration and vision loss.
- Overusing antivirals without steroids.
- Discharging without clear follow-up plan.
Rookie Pearls
- Forehead involvement = Bell’s palsy; forehead sparing = stroke.
- Always start steroids within 72 hrs.
- Don’t forget eye care — vision is at stake.
- Most patients recover — reassurance is important.
Take-Home Message
Bell’s palsy is a clinical diagnosis. For rookies:
- Involves entire half of the face (forehead + eye + mouth).
- Treat with steroids, ± antivirals, and eye protection.
- Rule out stroke if atypical or forehead spared.
Remember: You’re not just treating paralysis — you’re protecting the patient’s eye and their quality of life.
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