Patient is having problem while waking for so long and when returns from gym and when she is on her periods. When she drives for so long. Kindly correlate and interpret.
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VNG Report Interpretation — Jasleen Kapan, 48F (21/Apr/2026)
Summary of Findings
| Test | Result | Interpretation |
|---|---|---|
| Saccades (H & V) | Velocity, precision, latency all within normal limits | Central saccade pathways intact |
| Smooth Pursuit Horizontal (0.2 Hz) | Gain 0.28–0.45 (both eyes, both directions) | Significantly reduced (normal ≥ 0.8) |
| Smooth Pursuit Horizontal (0.4 Hz) | Gain 0.36–0.52 | Reduced (age-expected slight drop, but still below normal) |
| Smooth Pursuit Vertical (0.2 Hz) | Gain 0.50–0.55 | Borderline low-normal |
| Smooth Pursuit Vertical (0.4 Hz) | Gain 0.26–0.31 | Significantly reduced |
| Optokinetic (OKN) all directions | Gain 0.89–1.15 (10° and 20° stimuli) | Normal |
| Spontaneous nystagmus (light/dark) | None recorded | Normal |
| High-frequency head shake | No post-head shake nystagmus | Normal |
| Gaze tests (all positions) | No gaze-evoked nystagmus | Normal |
| Dix-Hallpike Right | No nystagmus in all positions | Negative |
| Dix-Hallpike Left — Supine Head Ext. & Left | Left eye: vertical nystagmus, SPV 19.96°/s, amplitude 7.62°, freq 0.96 Hz | Positive — left posterior canal BPPV |
| Dix-Hallpike Left — Return to Sit (second recording) | Left eye: vertical SPV −3.14°/s, amplitude 0.10°, freq 0.95 Hz | Minimal reversal nystagmus on return (consistent with BPPV) |
| Subjective Visual Vertical (SVV) | Deviations of 1° (clockwise) and −1° (anticlockwise/blank) | Within normal limits (normal < 2–2.5°) |
Key Abnormalities
1. Bilaterally Reduced Smooth Pursuit Gain (Horizontal > Vertical)
Horizontal smooth pursuit gain of 0.28–0.52 is well below the expected ≥ 0.80 for a 48-year-old. This is a bilateral, symmetric abnormality. Reduced smooth pursuit in isolation — without gaze-evoked nystagmus, without saccadic intrusions, and with normal OKN — points to a central vestibulo-cerebellar pathway dysfunction, specifically involving the flocculus/paraflocculus of the cerebellum, which normally drives smooth pursuit. However, it can also be seen in:
- Vestibular migraine (the most likely diagnosis in this clinical context — see below)
- Medications (sedatives, anticonvulsants, alcohol — must be excluded)
- Mild cerebellar or brainstem lesions
The OKN gain being fully preserved (0.89–1.15) while smooth pursuit is impaired is a significant dissociation: OKN is driven by a lower-level brainstem–retinal reflex arc and does not require cerebellar smooth pursuit circuits, so this pattern is consistent with a cerebellar/cortical pursuit pathway defect rather than a retinal or brainstem problem.
2. Left Posterior Canal BPPV
The Dix-Hallpike Left (supine, head extended and rotated left) produced:
- Vertical nystagmus in the left eye at 0.96 Hz, SPV 19.96°/s, amplitude 7.62°
- This is characteristic of left posterior semicircular canal BPPV — free-floating otoconia (canalith) in the left posterior canal generates geotropic, upbeat-torsional nystagmus when triggered by the provoking head position
- The minimal reversal nystagmus on sitting back up is further confirmatory
- Dix-Hallpike Right was completely negative
Clinical Correlation with Symptoms
| Symptom | Mechanism |
|---|---|
| Dizziness after prolonged walking | Low-level continuous head motion at ~2 Hz demands sustained vestibulo-ocular and cerebellar smooth pursuit compensation. In this patient, impaired smooth pursuit and a subclinical left BPPV combine to degrade gaze stability with repetitive head micro-movements during walking, causing dizziness/unsteadiness on prolonged ambulation. |
| Dizziness after returning from gym | Exercise causes sustained head movement, elevated cardiovascular output, and in susceptible patients (especially those with vestibular migraine), exercise is a well-documented trigger. Vigorous gym activity likely displaces the otolithic debris further or provokes a migraine-related episode through vascular/autonomic mechanisms. |
| Symptoms worsening during menstruation | Estrogen and progesterone fluctuations at menstruation have direct effects on labyrinthine fluid dynamics (endolymph volume regulation) and lower the central vestibular migraine threshold. Menstrual vestibular migraine is a recognised entity — estrogen withdrawal before menstruation drops the migraine threshold, and the inner ear is highly sensitive to these hormonal changes. This cyclical pattern in a 48-year-old woman also raises consideration of perimenopause, where hormonal fluctuation is maximal and worsens vestibular symptoms. |
| Dizziness during prolonged driving | Driving provides sustained optokinetic stimulation (visual flow from passing scenery) without corresponding vestibular/proprioceptive movement matching — a sensory mismatch or "visual dependency" state. Patients with smooth pursuit dysfunction rely excessively on visual input and are overwhelmed when visual-vestibular conflict is high (classic "highway driving" dizziness). The left BPPV can also be provoked by head turns while checking mirrors. |
Integrated Diagnosis
Primary diagnosis: Vestibular Migraine with left posterior canal BPPV
The overall pattern — bilaterally reduced smooth pursuit (central vestibular sign), left posterior canal BPPV (peripheral component), cyclical worsening with menstruation, symptom provocation with exercise and prolonged locomotion, and preserved gaze/saccades/OKN — is most consistent with vestibular migraine as the unifying diagnosis, with a concurrent left posterior canal BPPV explaining positional symptoms.
At age 48, perimenopause is a major contributing factor that amplifies both components through hormonal fluctuation.
Recommended Management
- Left posterior canal BPPV → Epley manoeuvre (left side) — highly effective canalith repositioning; expect resolution in 1–3 sessions
- Vestibular migraine evaluation — detailed headache/dizziness diary; assess for migraine history (even "silent" migraine without headache)
- Vestibular physiotherapy — gaze stabilisation exercises to address smooth pursuit deficit
- Hormonal assessment — gynaecological review for perimenopausal status; hormone fluctuation management may significantly reduce cyclical vestibular episodes
- Trigger avoidance — vigorous head-impact exercise (avoid high-impact gym activities during symptomatic periods), adequate hydration, sleep hygiene
- Migraine prophylaxis — if frequency warrants, consider propranolol, nortriptyline, or venlafaxine (all have evidence for vestibular migraine)
Note: This interpretation is based on the VNG data and clinical context provided. The formal report section (Impression/Clinical History) in the original document was left blank. A complete clinical assessment including audiometry, full neurological examination, and migraine history is essential before initiating management.
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