Correct Answer: 2. Unilateral fluctuating sensorineural hearing loss with aural fullness
Clinical Presentation Analysis
The client's report of severe rotatory vertigo lasting hours, accompanied by left ear fullness, tinnitus (ringing sounds), and temporary hearing loss, is the classic tetrad of
Ménière's disease (MD). The hallmark of this condition is its unilateral and episodic nature, which directly points to the characteristic assessment finding.
Pathophysiology and Symptom Correlation
The underlying histopathological finding in MD is
endolymphatic hydrops (EH), a distension of the endolymphatic spaces in the inner ear
[2]. While the exact trigger is considered multifactorial—involving immune, viral, genetic, and vascular mechanisms—the resulting pressure fluctuations and eventual rupture of the membranous labyrinth explain the episodic symptoms
[2]. The sensation of aural fullness is a direct consequence of this increased endolymphatic pressure. The vertigo is caused by a sudden influx of potassium-rich endolymph into the perilymph, which depolarizes and temporarily paralyzes the vestibular nerve. The hearing loss and tinnitus result from the mechanical and chemical disruption of the cochlear hair cells. Crucially, because the pathological process is in the cochlea and vestibular apparatus, the resulting hearing loss is classified as
sensorineural hearing loss (SNHL), not conductive [2,3].
Why Other Options Are Incorrect
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Option 1: Bilateral hearing loss is not characteristic of classic MD, which is overwhelmingly unilateral in its early and middle stages. Furthermore, bone conduction better than air conduction describes a conductive hearing loss, which localizes the problem to the external or middle ear, not the inner ear pathology of MD
[2].
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Option 3: While MD does cause sensorineural hearing loss, it is typically unilateral, not bilateral. More importantly, the classic audiometric pattern in early MD is a low-frequency "rising" curve, not a high-frequency loss . High-frequency loss is more characteristic of noise-induced hearing loss or presbycusis .
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Option 4: Cerumen impaction is a cause of conductive hearing loss, which is a problem of sound transmission in the external auditory canal. This does not explain the vertigo, tinnitus, and aural fullness that define the Ménière's symptom complex
[2].
Diagnostic Confirmation
The most characteristic assessment finding is documented through pure-tone audiometry. In MD, the hearing loss is
fluctuating, meaning it can worsen during an attack and improve between episodes, especially in the early stages. Over time, the low-frequency SNHL can become permanent and may progress to involve all frequencies, a pattern described as a "flat" curve in later disease stages . Advanced diagnostic tools, such as hydrops magnetic resonance imaging (MRI), can now visualize endolymphatic hydrops in vivo, and intracochlear electrocochleography (IC ECochG) can show an elevated summating potential to action potential ratio, reflecting the abnormal inner ear pressure [3,4]. These findings confirm that the primary dysfunction is within the cochlea, producing a unilateral, fluctuating sensorineural hearing loss, which is the assessment finding most specific to Ménière's syndrome [2,3].
References (research sources)