A 38-year-old woman with a 2-week history of sudden hearing loss in the left ear presents to the clinic. Otoscopy is normal. Weber test lateralizes to the right ear. Rinne test shows bone conduction > air conduction on the left. Pure tone audiometry confirms unilateral sensorineural hearing loss (SNHL) with threshold of 45 dB. She denies vertigo or tinnitus. What is the most appropriate immediate next step?

Explanation

## Sudden Sensorineural Hearing Loss (SSHL): Urgent Management **Key Point:** Sudden SNHL (onset ≤ 72 hours, ideally within 2 weeks) is an otologic emergency. Immediate corticosteroids + imaging is the standard of care to maximize recovery and exclude retrocochlear pathology. ### Definition & Epidemiology **High-Yield:** Sudden SNHL = ≥ 30 dB hearing loss in ≥ 3 consecutive frequencies within 72 hours. Incidence ~5–20 per 100,000 annually. Idiopathic in ~90% of cases, but retrocochlear lesion must be excluded. ### Diagnostic & Management Algorithm ```mermaid flowchart TD A[Sudden SNHL ≤72 hours]:::outcome --> B[Confirm with audiometry]:::action B --> C[Start oral corticosteroids immediately]:::action C --> D[Arrange MRI temporal bones within 2 weeks]:::action D --> E{MRI findings?}:::decision E -->|Retrocochlear lesion| F[Specialist referral]:::urgent E -->|Normal| G[Continue steroids + supportive care]:::action G --> H[Repeat audiometry at 4 weeks]:::action H --> I{Hearing recovery?}:::decision I -->|Yes| J[Discharge with counseling]:::outcome I -->|No/Partial| K[Consider intratympanic steroids]:::action ``` ### Corticosteroid Regimen | Parameter | Details | |-----------|----------| | **First-line agent** | Oral prednisolone 1 mg/kg/day (max 80 mg) × 7–14 days, then taper | | **Timing** | Within 2 weeks of onset; efficacy decreases after 4 weeks | | **Evidence** | Improves hearing recovery by ~15–20% if started early | | **Contraindications** | Active infection, uncontrolled diabetes, psychosis (relative) | **Clinical Pearl:** Early initiation of steroids (within 1 week) yields better outcomes. Delay beyond 4 weeks significantly reduces efficacy. ### Why MRI Is Essential **Mnemonic:** **SSHL Mimics = VANS** — **V**estibular schwannoma (acoustic neuroma), **A**utoimmune (AIED), **N**eurologic (MS, stroke), **S**yphilis. MRI excludes retrocochlear pathology in ~5–10% of "idiopathic" SSHL cases. **Warning:** Do NOT delay steroids while waiting for imaging. Start steroids immediately; arrange MRI in parallel (within 2 weeks). ### Why NOT the Other Options? | Option | Why Wrong | |--------|----------| | **Hearing aid fitting** | Premature; steroids + time may restore hearing. Aids are considered only after 3–6 months of failed recovery. | | **Caloric testing** | Assesses vestibular function, not indicated in SSHL without vertigo. Wastes critical time. | | **Observation alone** | Spontaneous recovery occurs in ~30–50%, but steroids improve this to ~50–70%. Observation without treatment is suboptimal. | **High-Yield:** The window for effective steroid therapy is narrow (ideally < 2 weeks, acceptable up to 4 weeks). Delay = lost opportunity for recovery. [cite:Dhingra 8e Ch 7; Lalwani 5e Ch 9]