The Vertiginous Post-Operative Ear
A 47-year-old woman is seen 9 days after an uneventful left tympanoplasty with mastoidectomy for chronic suppurative otitis media. At the time of surgery the ossicular chain was intact and the middle ear was cleared of cholesteatoma; the graft was laid over the malleus handle. She now reports spinning vertigo of sudden onset, present at rest, with nausea and unsteadiness when walking in the dark. There is no fever, no otorrhoea and the wound is clean. On examination she has a right-beating spontaneous nystagmus with the fast phase to the right, no fistula response on pneumatic otoscopy, normal facial nerve function, and a positive head impulse test to the left. Tuning fork testing shows a left conductive loss unchanged from the pre-operative state. She is anxious about permanent dizziness and asks whether the graft has failed.
1. How do you interpret the direction of the spontaneous nystagmus and the head impulse findings, and what does this localise the lesion to?
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The fast phase of a spontaneous nystagmus beats away from the side of the reduced peripheral vestibular tone. A right-beating nystagmus therefore indicates a relative left-sided peripheral hypofunction, which fits a left middle-ear/surgical insult. The positive head impulse to the left confirms an impaired left horizontal vestibulo-ocular reflex (the corrective catch-up saccade occurs because the left canal cannot drive the eyes).
Taken together this is a left peripheral vestibular lesion, not central: there is no direction-changing or vertical nystagmus, no skew, and the deficit respects a single canal plane. The differential is post-operative serous labyrinthitis, a perilymph leak through the oval or round window, or direct surgical trauma. Fistula testing is negative, which lowers but does not exclude a leak; the absence of fistula response is common in small leaks.
2. What is your immediate management plan, and which single investigation would you use to distinguish serous labyrinthitis from a perilymph fistula?
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Initial management is conservative and expectant, because the most likely diagnosis is serous labyrinthitis from blood and drill debris entering the labyrinth:
- Admit or observe closely with vestibular sedatives only short term (prochlorperazine or betahistine) so that central compensation is not suppressed indefinitely.
- Bed rest with head elevation, avoid straining, nose-blowing and heavy lifting.
- Steroids (a short oral tapering course) are used by many to reduce labyrinthine inflammation.
- Review the graft and wound; there is no otorrhoea, so antibiotics are not indicated unless infection emerges.
- Reassure her that the graft is intact: a conductive loss unchanged from pre-op and a clean graft do not indicate failure.
The discriminating investigation is high-resolution CT of the temporal bone, which can show pneumolabyrinth or a defect at the oval/round window. If the vertigo persists beyond 5-7 days, or if a fistula is suspected, exploratory tympanotomy with packing of the oval and round windows is the definitive step. MRI with heavily T2-weighted sequences can also demonstrate labyrinthine signal change in serous labyrinthitis.
3. She returns 3 weeks later with persistent unsteadiness and now a left-sided hearing loss worse than before surgery. What has changed in your thinking?
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Deterioration in hearing with persistent vertigo changes the diagnosis from a self-limiting serous labyrinthitis to a structural problem: a perilymph fistula that has not sealed, or a missed labyrinthine injury. The new sensorineural component means the inner ear is now involved, not just the middle ear.
I would:
- Repeat audiometry and tympanometry to document the new sensorineural loss.
- CT temporal bone if not already done, looking for pneumolabyrinth or a widened vestibular aqueduct/cochlear anomaly.
- Proceed to exploratory tympanotomy with careful inspection of the oval and round windows and packing with fascia or fat if a leak is found. This should not be delayed further, as persistent fistula risks permanent sensorineural loss.
- Consider vestibular rehabilitation once the acute phase settles, and counsel her that compensation takes weeks to months and that the new hearing loss may be permanent.
The key exam judgement is that worsening hearing plus persistent vertigo after ear surgery is a surgical problem until proven otherwise, not a reason to persist with sedatives.