A 38-year-old woman from Mumbai presents with sudden hearing loss in the left ear for 3 days, accompanied by ear fullness and mild vertigo. Otoscopy is normal. Weber test lateralizes to the right ear. Rinne test on the left shows air conduction better than bone conduction, but the air-bone gap is only 10 dB. Pure tone audiometry shows a low-frequency sensorineural hearing loss (500–2000 Hz) on the left. What is the most likely diagnosis?

Explanation

## Diagnosis: Ménière Disease in the Acute Phase ### Clinical Presentation **Key Point:** Ménière disease is characterized by the classic triad of episodic vertigo, fluctuating sensorineural hearing loss, and aural fullness/tinnitus. The acute phase can mimic SSNHL but has distinguishing features. ### Why This Is Ménière Disease (Not SSNHL) | Feature | This Patient | Ménière Disease | SSNHL | |---------|-------------|-----------------|-------| | **Hearing loss pattern** | Low-frequency SNHL (500–2000 Hz) | **Classic low-frequency SNHL** | Any frequency; flat or high-frequency more common | | **Ear fullness** | Present | **Classic symptom** | May be present | | **Vertigo** | Mild, present | **Present (episodic)** | Mild or absent | | **Otoscopy** | Normal | Normal | Normal | | **Onset** | Sudden, 3 days | Can be sudden in acute phase | Sudden (≤3 days) | | **Audiometric pattern** | Low-frequency dip | **Low-frequency dip (hallmark)** | Variable | **Clinical Pearl:** The combination of **low-frequency SNHL + ear fullness + vertigo** is the hallmark triad of Ménière disease. SSNHL typically presents with flat or high-frequency loss and minimal or no vertigo. Low-frequency sensorineural hearing loss (500–2000 Hz) is the **audiometric signature of Ménière disease**, not SSNHL. ### Pathophysiology **High-Yield:** Ménière disease results from **endolymphatic hydrops** — accumulation of endolymph in the membranous labyrinth of the inner ear. This distorts the basilar membrane preferentially at the apex (low-frequency region), explaining the characteristic low-frequency hearing loss. - Increased endolymphatic pressure → distortion of Reissner's membrane - Apical cochlear involvement → low-frequency SNHL - Saccular/utricular involvement → episodic vertigo - Aural fullness from elevated endolymphatic pressure ### Diagnostic Criteria (AAO-HNS 2015 — Definite Ménière Disease) 1. Two or more spontaneous episodes of vertigo (20 min–12 hours) 2. Audiometrically documented low- to mid-frequency SNHL in the affected ear 3. Fluctuating aural symptoms (hearing loss, tinnitus, or fullness) 4. Not better accounted for by another diagnosis **Note:** In the **acute phase** (first presentation), full criteria may not yet be met — this is termed "probable Ménière disease." The audiometric pattern and symptom triad are sufficient for clinical diagnosis. ### Why Other Options Are Incorrect - **A) SSNHL:** SSNHL is defined as ≥30 dB loss in ≥3 consecutive frequencies over ≤3 days. While the onset is acute, SSNHL does NOT classically present with low-frequency loss + vertigo + ear fullness as a triad. The low-frequency audiometric pattern strongly favors Ménière disease. - **C) Acute otitis media:** Normal otoscopy excludes this diagnosis. AOM would show a dull, erythematous tympanic membrane with conductive hearing loss (air-bone gap >20 dB). - **D) Perilymphatic fistula:** Typically follows barotrauma, Valsalva, or head trauma. No such history is given. Vertigo is usually severe and positional. ### Management of Acute Ménière Disease - **Acute attack:** Vestibular suppressants (diazepam, promethazine), antiemetics - **Long-term:** Low-sodium diet, diuretics (hydrochlorothiazide + triamterene), betahistine - **Refractory:** Intratympanic gentamicin or steroids; endolymphatic sac surgery **Mnemonic:** **Ménière = Low-frequency SNHL + Vertigo + Fullness + Tinnitus** — the "LVFT" triad distinguishes it from SSNHL. [cite: Cummings Otolaryngology – Head and Neck Surgery, 7th ed., Ch. 163; AAO-HNS Ménière Disease Guidelines 2020; Scott-Brown's Otorhinolaryngology, 8th ed.]