Ménière’s disease
Fluctuating endolymphatic hydrops, fluctuating utricular function, and an SVV that rises and falls with the disease.
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Ménière's disease has a fluctuating natural history, and the SVV fluctuates with it. The clinical value of SVV here is longitudinal: serial readings over months are more informative than any single measurement.
During an acute attack, the SVV typically tilts four to eight degrees toward the affected side, often with horizontal nystagmus. Hours to days later it decays toward two to four degrees. Between attacks it is often normal, though small persistent tilts occur.
Why? Endolymphatic hydrops distends the membranous labyrinth. The utricular macula is mechanically distorted, and intermittent compromise of utricular afferents produces the asymmetry that SVV detects. As hydrops waxes and wanes, so does the SVV.
Compared with vestibular neuritis, Ménière's tilts are smaller and more variable. The direction is reliably ipsilesional across multiple attacks — this consistency separates Ménière's from vestibular migraine, where direction wanders.
The Bárány Society diagnostic criteria do not require an abnormal SVV. It is a supportive sign, not diagnostic. Its main role is in lateralisation when the audiogram is bilaterally abnormal, and in monitoring response to treatment.
Intratympanic gentamicin produces a striking progressive ipsilesional SVV tilt, marking ablation of utricular function. Some patients have a measurable jump from three degrees to eight degrees over weeks after the first injection.
End-stage Ménière's varies. Some patients have complete vestibular failure on the affected side with full central compensation — and a normal SVV. Others retain a persistent tilt as a marker of ongoing utricular damage.
Expected SVV signature
| Phase | Direction | Magnitude | Notes |
|---|---|---|---|
| Acute attack | Ipsilesional | 4–8° | Often with horizontal nystagmus; may briefly reverse direction |
| Days–weeks after | Ipsilesional | 2–4° | Decaying toward baseline |
| Between attacks | Often normal | 0–3° | Variable across patients and visits |
| End-stage (burnt-out) | Variable | Often normal | After repeated attacks, asymmetry may persist or compensate fully |
Compared with vestibular neuritis, Ménière’s SVV is smaller and more variable. Serial measurements over months are more informative than any single reading[6].
Why the SVV fluctuates
The mechanical theory of Ménière’s — endolymphatic hydrops distending the membranous labyrinth — implicates both the cochlear duct and the utricle. Distortion of the utricular macula and intermittent mechanical compromise of utricular afferents produce the asymmetry that SVV detects. Because hydrops waxes and wanes, so does the SVV.
The Bárány Society diagnostic criteria[9]do not require an abnormal SVV. SVV is a supportive sign, not a diagnostic one. Its main value in Ménière’s is tracking the burden of utricular involvement and confirming the side of the lesion when the audiogram is bilaterally abnormal.
Clinical use
- Lateralising the lesion when the audiogram is ambiguous or bilateral — SVV tilts ipsilesionally in active disease.
- Tracking response to intratympanic gentamicin — progressive ipsilesional tilt after treatment confirms ablation of utricular function.
- Distinguishing from vestibular migraine— SVV tilts in Ménière’s tend to persist between attacks more often than in vestibular migraine, where they typically normalise quickly.
Companion findings
- Low-frequency sensorineural hearing loss (rising audiogram)
- Reduced cVEMP amplitude or absent response on the affected side (saccular hydrops)
- Variable caloric weakness, more pronounced after multiple attacks
- Abnormal oVEMP correlates with the SVV finding (utricular involvement)