Clinical Summary

Most Likely Pathology

1. Endolymphatic Hydrops / Delayed Hydrops (Top differential)

• Left-sided moderate sloping SNHL + episodic vertigo is the classic signature
• Hydrops causes pressure fluctuations in the endolymphatic compartment; upright posture increases perilymphatic/CSF pressure gradient, worsening symptoms — relieved by sitting/lying
• No spontaneous nystagmus between episodes is consistent (unlike acute vestibular neuritis)
• Duration of 3–4 months fits a subacute progressive course

2. Superior Semicircular Canal Dehiscence (SSCD)

• Causes pressure-sensitive vertigo (Tullio phenomenon / Hennebert sign)
• Standing increases intracranial/intralabyrinthine pressure via hydrostatic column
• Associated with low-frequency conductive overlay on SNHL — a sloping loss pattern is possible
• No spontaneous nystagmus is typical at rest
• CT temporal bone (0.5 mm cuts) would confirm/refute

3. Vascular / Microvascular Labyrinthine Ischemia

• Lacunar infarcts on MRI indicate small vessel cerebrovascular disease
• The anterior inferior cerebellar artery (AICA) and its labyrinthine branch are vulnerable to microvascular disease
• Can cause unilateral cochleo-vestibular dysfunction (hearing loss + vertigo)
• Orthostatic component: orthostatic hypotension in a vascular patient drops posterior circulation perfusion pressure on standing — plausible given the lacunar substrate
• Check lying/standing BP — a drop of ≥20 mmHg systolic would support this

4. Perilymph Fistula

• Pressure-sensitive vertigo (standing = Valsalva-like effect via jugular venous pressure)
• Can accompany SNHL
• Less likely without a history of trauma or ear surgery, but worth considering

Why NOT Pure Central (Lacunar) Cause?

Recommended Workup

Working Diagnosis Priority

1. Endolymphatic hydrops (with or without Meniere's phenotype) — most consistent with sloping SNHL + postural vertigo + no inter-ictal nystagmus
2. SSCD — must exclude with CT
3. Microvascular labyrinthine ischemia — plausible given vascular background; check for orthostatic hypotension

Revised Diagnosis: Primary Orthostatic Tremor (POT)

Why This Fits Perfectly

"Orthostatic tremor is a high-frequency, low-amplitude tremor predominantly involving the lower extremities. Patients often report shakiness or unsteadiness on standing and improvement with sitting or walking. Falls are common. The tremor is often only appreciable by palpating the legs while standing."

What Is Happening Physiologically?

• POT is a 16 Hz (13–18 Hz) synchronous tremor of leg and trunk muscles generated by a CNS oscillator (likely cerebellar-thalamic circuit)
• On standing, this tremor fires continuously → patient feels ground is shaking under them → perceived as "dizziness" or vertigo
• Walking interrupts the synchronized oscillation → relief
• Sitting/lying removes the need for postural tone → no tremor → relief

Relationship to Your Other Findings

How to Confirm at Bedside Right Now

1. Palpate the quadriceps / gastrocnemius while patient stands — you will feel a fine rapid tremor (~16 Hz), often invisible to the eye
2. Ask patient to walk a few steps — tremor and dizziness should immediately resolve
3. Surface EMG if available — 16 Hz burst pattern is diagnostic

Investigations

Management of POT

Bottom Line

• Leg shivering within 10 seconds of standing
• Perceived dizziness/vertigo while upright
• Complete relief on sitting, lying, or walking
• Normal gait between episodes
• Lacunar disease provides a plausible structural substrate for secondary POT

POTS vs POT — Head-to-Head Against Your Patient

Key Differentiator

"Heart rate increase to >120 bpm OR increase of ≥30 bpm with standing, subsiding on sitting or lying"

However — Do NOT Dismiss POTS Completely

• Orthostatic dizziness
• Relief on sitting/lying
• Small vessel/autonomic dysfunction context (relevant given lacunar infarcts)

One Simple Bedside Test Separates Them

Verdict

Idiopathic POT — Gradual Onset

• Develops insidiously over months to years
• No clear precipitating event
• Slowly progressive — patients learn to avoid prolonged standing
• Cause unknown — likely a genetically determined CNS oscillator dysfunction

Secondary POT (Your Patient's Scenario) — Can Be Sudden

How Lacunar Infarcts Trigger POT Suddenly

Timeline Makes Sense

Lacunar infarct occurs (silent or with mild symptoms)
        ↓
Disrupts thalamo-cerebellar postural circuit
        ↓
16 Hz oscillator becomes unmasked / disinhibited
        ↓
Orthostatic tremor appears — within days to weeks
        ↓
Patient notices "shivering legs on standing" ~3–4 months ago

Supporting Evidence — Why Sudden Onset Points to Secondary POT

What This Means Clinically

1. Look carefully at MRI infarct locations — thalamic or pontine lacunes are the most likely culprits. If the report just says "lacunar infarcts" without specifying location, request a review focused on thalamus, pons, and cerebellar peduncles.
2. This patient needs secondary stroke prevention — antiplatelets, BP control, statin. A new infarct in the same territory could worsen symptoms.
3. The SNHL fits the same vascular etiology — cochlear artery is a terminal branch with no collaterals; the same small vessel disease that caused lacunar infarcts likely caused cochlear ischemia → left sloping SNHL.

Bottom Line

Exercise & Comfort Strategies for Your Patient

Important Principle First

1. Graded Standing Tolerance (Core Exercise)

2. Weight Shifting Exercises

• Heel-to-toe rocking while standing: rock forward onto toes then back to heels, rhythmically — 20 repetitions
• Side-to-side weight shifts: shift weight left foot → right foot, slowly — 20 reps
• Mini marching on spot: lift feet alternately just 2–3 cm off ground

3. Leg Strengthening (Reduces Tremor Amplitude)

4. Gaze Stabilization + Balance (Vestibular Component)

• VOR exercise: Hold a card with text at arm's length, move head side to side while keeping text in focus — 1 minute, twice daily
• Tandem stance (heel-to-toe): Hold for 10–20 seconds, eyes open → progress to eyes closed
• Single leg stance: Hold rail, stand on one leg 10 seconds each side

5. Practical Comfort Adaptations

A walking stick is often transformative in POT — patients find that even light contact with a support surface dramatically reduces the tremor. This is a well-recognized clinical trick.

6. Medical Support Alongside Exercises

• Clonazepam 0.25–0.5 mg at night (start low given vascular background)
• Gabapentin 100–300 mg BD — good tolerability in elderly vascular patients
• Physiotherapist referral for supervised graded standing program

Progression Goals

Week 1–2:  Stand 30 sec with support → No distress
Week 3–4:  Stand 60 sec with light touch → Manageable
Week 6–8:  Stand 2 min unsupported → Functional independence
Month 3+:  Stand in queue, cook at stove, perform ADLs

Bottom Line

1. Walking stick / counter touch — instant relief, use now
2. Weight shifting while standing — breaks the tremor cycle
3. Graded standing desensitization — rebuilds tolerance over weeks

Clinical Summary — Compiled Brief

Patient Profile

• Symptoms: Vertigo + leg shivering within 10 seconds of standing, relieved immediately by sitting/lying, absent during walking
• Hearing: Left ear moderate sloping SNHL
• Duration: 3–4 months (subacute onset)
• MRI: Lacunar infarcts
• Examination: No spontaneous nystagmus, normal gait

Diagnosis: Secondary Orthostatic Tremor (POT)

Why POT and Not Others

Pathophysiology

Small vessel disease (lacunar infarcts)
        ↓
Disrupts thalamo-cerebellar postural oscillator
(VIM thalamus / pontine / dentatothalamic tract)
        ↓
16 Hz synchronous leg muscle tremor unmasked
        ↓
Fires only during static standing (postural tone required)
        ↓
Walking = oscillator desynchronized → relief
Sitting/lying = no postural tone needed → relief

Investigations

Bedside Confirmation Right Now

1. Palpate thigh/calf while patient stands — feel 16 Hz tremor
2. Ask patient to walk 5 steps — symptoms resolve immediately
3. Check standing HR — excludes POTS

Treatment

Pharmacological

Immediate Comfort

• Walking stick / light finger touch on surface — breaks oscillator instantly
• Slightly wider stance when standing
• Weight shifting (heel-toe rocking, side-to-side) while standing

Rehabilitation Exercises

Secondary Stroke Prevention (Critical — do not miss)

• Antiplatelet (aspirin/clopidogrel)
• Statin
• BP control — target <130/80 mmHg
• Diabetic/metabolic risk factor management

Prognosis

• Secondary POT from vascular cause may plateau if no new infarcts occur
• With pharmacotherapy + rehabilitation: significant functional improvement expected in 6–8 weeks
• Without stroke prevention: risk of new infarcts worsening the tremor

One-Line Summary

Subacute secondary orthostatic tremor from small vessel cerebrovascular disease — unified etiology explains lacunar infarcts + orthostatic leg tremor + left SNHL. Treat with clonazepam/gabapentin, graded standing rehabilitation, walking aid, and aggressive vascular risk factor control.

MD / EH / Tumarkin Crisis vs POT — Full Debate

First: Why Does POT Cause One-Sided Hearing Loss?

The Meniere's / Endolymphatic Hydrops Case

"Definite MD = 2 or more episodes of vertigo lasting 20 min–12 hours + fluctuating or non-fluctuating SNHL, tinnitus or aural pressure, not better explained by another disorder"

What FITS MD/EH in Your Patient

Tumarkin Otolithic Crisis — This Is the Key Point

Classic Description

• Patient suddenly feels pushed or thrown to ground
• No warning, no vertigo beforehand necessarily
• No LOC — fully conscious throughout
• Lasts seconds
• Happens during standing or walking
• Patient cannot prevent the fall

How This Compares to Your Patient

The One Feature That Still Separates Them

The Hearing Loss Pattern Is Actually Important Here

Revised Differential with Honest Ranking

PRESENTATION:
Standing → leg shivering within 10 sec → must sit
Walking = no symptoms
Left sloping SNHL | Lacunar infarcts | No nystagmus
Duration 3–4 months

What You Must Ask/Check Now

1. Character of leg symptom

• "Does your leg shake/vibrate?" → POT
• "Do your legs suddenly give way without warning?" → Tumarkin

2. Hearing fluctuation

• "Does your hearing get worse before/during attacks then come back?" → MD/EH
• "Is hearing constantly reduced since it started?" → Vascular SNHL

3. Tinnitus + aural fullness

• "Do you get ringing or blocked ear feeling before attacks?" → MD/EH prodrome

4. Walking test

• "When you walk, do attacks still happen?"
• If YES → Tumarkin possible
• If NO → POT favored

Bottom Line

Complete Case Reframe

What Todd's Palsy Tells You

"Patients may experience a localized paresis (Todd's paralysis) for minutes to many hours in the involved region following the seizure"

Now Re-read the Entire Clinical Picture

Lacunar infarcts on MRI
        ↓
Epileptogenic focus (perilesional cortex around infarct)
        ↓
Focal cortical seizures — motor cortex involvement
        ↓
Postictal state (Todd's palsy)
        ↓
Transient leg weakness → cannot stand → must sit

The Entire Symptom Complex Reinterpreted

Why Seizures Cause This Posture-Linked Pattern

Jacksonian March Connection

"Abnormal motor movements may begin in a very restricted region, such as the fingers, and gradually progress over seconds to minutes — Jacksonian march"

Revised Unified Diagnosis

Focal (Structural) Epilepsy Secondary to Cerebrovascular Small Vessel Disease

• Seizure type: Focal motor seizure (clonic — lower limbs) ± ictal vertigo
• Postictal: Todd's palsy of legs → cannot sustain standing
• Structural cause: Lacunar infarcts → perilesional epileptogenic cortex
• Comorbidity: Left SNHL — still likely independent vascular cochlear ischemia OR consider ictal auditory phenomenon if left temporal lobe involved

Does MD / Tumarkin / POT Still Apply?

Immediate Management Priorities

1. Anti-epileptic Drug (AED)

2. Vascular Risk Factor Control (Unchanged — Critical)

• Antiplatelet + statin + BP control
• Every new lacunar infarct = new potential epileptogenic focus

3. EEG

• Interictal EEG — look for focal slowing or epileptiform discharges over the hemisphere corresponding to lacunar infarcts
• Video-EEG ideally — capture an event to confirm ictal vs non-ictal

4. MRI Review

• Request cortical/subcortical mapping — identify if any lacune is cortical or immediately subcortical (more epileptogenic than deep lacunes)
• DWI — is there a fresh infarct not previously identified?

5. Left SNHL Workup (Separate Track)

• Audiogram, ECochG, glycerol test — still investigate for EH/MD independently

Bottom Line

The "orthostatic tremor" was focal motor seizure activity. The "inability to stand" was Todd's postictal palsy. The trigger was standing-induced hemodynamic stress lowering the seizure threshold in perilesional vascular cortex.

Practical takeaway

• Episodes of leg shaking + inability to stand are most likely ictal (seizure) + postictal weakness
• POT/POTS/MD become secondary differentials unless new otologic evidence appears
• Left SNHL can be a separate comorbidity (vascular/cochlear), investigate in parallel but do not let it distract from seizure control

What to do now

1. Optimize anti-seizure therapy (adherence, dose, timing, breakthrough triggers)
2. EEG / video-EEG if events continue
3. Repeat MRI protocol review for structural epileptogenic focus
4. Strict stroke prevention (BP, glucose, lipids, antiplatelet/statin as indicated)
5. Safety: no driving, fall precautions, supervised standing/bathing
6. If standing specifically triggers episodes, check orthostatic BP/HR and treat hypotension/dehydration to reduce seizure provocation

Holter Analysis — Satya Dev Prasad, 50M

Key Holter Findings

The Most Important Finding: Reduced HRV

The autonomic nervous system is dysregulated — the same small vessel cerebrovascular disease causing lacunar infarcts is damaging central autonomic pathways (insular cortex, hypothalamus, brainstem autonomic nuclei)

Now Answering Your Core Question

"If we don't know Todd's palsy — what is the vestibular diagnosis with hand + leg shivering?"

Revised Differential (Blinded to Todd's/Seizure Diagnosis)

1. Essential Tremor (ET) — Now Rises Significantly

2. Autonomic Tremor / Sympathetic Overdrive

• Prolonged tachycardia episodes (1h 14 min)
• Max HR 117 at 4:48 AM (nocturnal sympathetic surge)
• Low RMSSD = vagal tone lost = sympathetic dominance

• Fine tremor of hands
• Leg shakiness
• Dizziness on standing
• Palpitations

3. POT (Still on List)

4. Cerebellar Tremor (from Lacunar/Vascular Disease)

Holter + Vestibular Symptoms = Unified Picture

Small vessel cerebrovascular disease
            ↓
    ┌───────────────────────────────┐
    │                               │
Lacunar infarcts              Central autonomic
(cortical/subcortical)        pathway damage
    │                               │
    ↓                               ↓
Cerebellar/thalamic         Low HRV (RMSSD 12.9)
tremor circuit disruption   Sympathetic dominance
    │                               │
    ↓                               ↓
Hand + leg tremor           Tachycardia episodes
on standing                 PACs, nocturnal HR surge
    │                               │
    └──────────┬────────────────────┘
               ↓
    Dizziness + cannot stand
    + Left SNHL (cochlear ischemia)

Subjective Vestibular Screening — What to Document

Bottom Line — Without Knowing Todd's Palsy

Primary working diagnosis = Cerebellar/thalamic vascular tremor (postural) + autonomic dysfunction from central small vessel disease

1. Motor/cerebellar circuits → tremor
2. Central autonomic pathways → low HRV, tachycardia
3. Cochlear vasculature → left SNHL
4. Cortical motor areas → (seizures + Todd's — the diagnosis we now know)

Subjective Vestibular Screening — Blind Analysis

Patient Presentation Recap (Vestibular Lens Only)

What Subjective Vestibular Tools Would Be Used

1. Dizziness Handicap Inventory (DHI)

A high physical subscore with standing as the dominant trigger points toward postural vestibular disorder rather than rotational/positional BPPV

2. Vertigo Symptom Scale (VSS)

3. Activities-Specific Balance Confidence Scale (ABC)

• Expected: Low confidence scores (40–60%) for standing tasks
• Walking tasks: Near normal — because symptoms absent during walking
• This mismatch between standing and walking confidence is a red flag for a non-BPPV, non-peripheral etiology

Symptom Pattern Analysis — Vestibular Diagnostic Reasoning

Step 1: Is This Peripheral or Central?

Step 2: Apply the 4 Vestibular Symptom Categories

Differential Diagnoses From Pure Subjective Vestibular Screening

Tier 1 — Most Consistent

🔴 1. Persistent Postural Perceptual Dizziness (PPPD)

PPPD is the #1 diagnosis a vestibular screener would reach — it perfectly matches postural dizziness, relief with movement/sitting, 3+ month duration, and a peripheral lesion (SNHL) as the original trigger

🔴 2. Vestibular Migraine

Vestibular migraine can cause postural dizziness, SNHL-like fluctuation, and episodic standing intolerance

Tier 2 — Strongly Consider

🟡 3. Bilateral Vestibulopathy (BVP)

🟡 4. Mal de Débarquement Syndrome (MdDS)

The relief during walking is actually the signature of MdDS — patients feel better when moving, worse when still

🟡 5. Functional Vestibular Disorder / Somatoform Dizziness

Tier 3 — Red Flags Requiring Referral

🔴 RED FLAGS Identified During Subjective Screening

What a Vestibular Screener Would Conclude

SUBJECTIVE VESTIBULAR SCREENING IMPRESSION
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Pattern: POSTURAL VESTIBULAR SYNDROME
         (Standing-triggered, walking-relieved, chronic)

Most likely vestibular diagnoses:
  1. PPPD (Persistent Postural Perceptual Dizziness)
     — secondary to left peripheral vestibulopathy
  2. Mal de Débarquement Syndrome
  3. Vestibular Migraine

⚠️ RED FLAGS PRESENT:
  — Bilateral (hand + leg) tremor
  — Unilateral SNHL
  — Vascular age/profile

RECOMMENDATION:
  → Full objective vestibular battery (vHIT, VEMPs, CDP)
  → Neurology referral (tremor)
  → MRI brain (if not done)
  → Audiology workup
  → Do NOT manage as isolated vestibular disorder

Bottom Line

Predicted Test Findings & Interpretation

Patient Context Reminder

• Standing triggers symptoms within 10 seconds
• Walking = no symptoms
• Hand + leg tremor
• Left SNHL
• No spontaneous nystagmus
• Lacunar infarcts (known to us)

1. Romberg Test — Classical

Interpretation

2. Sharpened (Tandem) Romberg

Scoring Reference (Normal limits)

3. Clinical Test of Sensory Interaction in Balance (CTSIB) / Foam Romberg

4. Tandem Gait Test

Key diagnostic point: If tandem GAIT is relatively preserved but tandem STANCE (sharpened Romberg) fails — this confirms the postural > dynamic pattern, which is the hallmark of this case

5. Fukuda Stepping Test

Fukuda Interpretation Key

Composite Findings Summary

The Diagnostic Pattern This Creates

STANDING STATIC BALANCE  →  SEVERELY IMPAIRED
WALKING DYNAMIC BALANCE  →  RELATIVELY PRESERVED
FOAM CONDITIONS          →  FAIL (proprioception removed)
FUKUDA                   →  LEFT deviation

Vestibular Loss Pattern with Postural > Dynamic Deficit

What These Tests Would NOT Tell You

Clinical Pearl

The dissociation between poor static balance (standing) and preserved dynamic balance (walking) is the single most important finding in this patient's vestibular profile.

In pure peripheral vestibular loss — both are usually impaired. In PPPD — static worse than dynamic is classical. In cerebellar disease — both equally impaired.

This patient's walking-better-than-standing pattern, combined with left Fukuda deviation and foam failure, most strongly points to PPPD superimposed on left chronic peripheral vestibular hypofunction — which is exactly what a vestibular screener would conclude before neurology reveals the seizure diagnosis.

Question 1: Should You Check BP & Pulse in Different Positions?

YES — Absolutely. It is Mandatory in This Case.

• Dizziness is posture-triggered
• Symptoms onset within seconds of standing
• Patient cannot maintain upright position
• Vascular age/profile present

Protocol — Orthostatic Vital Signs

What Each Pattern Tells You

Critical Point for This Patient

• RMSSD 12.9 ms — severely reduced vagal tone
• Max HR 117 BPM — nocturnal tachycardia
• Prolonged tachycardia episode 1hr 14min

Reduced vagal tone (RMSSD 12.9)
        ↓
Impaired baroreflex buffering
        ↓
Standing → BP not maintained → cerebral hypoperfusion
OR
Standing → HR overshoots → palpitations + dizziness

As Vestibular Specialist — Document This

ORTHOSTATIC VITAL SIGNS DOCUMENTATION
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Supine:    BP ___/___  HR ___  Symptoms: None
Sitting:   BP ___/___  HR ___  Symptoms: ___
Standing 1min: BP ___/___ HR ___ Symptoms: ___
Standing 3min: BP ___/___ HR ___ Symptoms: ___
Standing 5min: BP ___/___ HR ___ Symptoms: ___

Orthostatic Hypotension: YES / NO
POTS Criteria Met: YES / NO
Symptoms Reproduced: YES / NO

Question 2: How Can This Be Postural Vestibular Syndrome?

Your Challenge Is Valid — Let Me Be Honest

What Postural Vestibular Syndrome Actually Means

• Symptoms present for 3–4 months
• Triggered by standing (postural)
• Persistent pattern

Why "Postural Vestibular Syndrome" Is Misleading Here

The Correct Terminology

Then Why Does He Have Vestibular-Like Symptoms?

Primary pathology (Seizure / Vascular tremor / Autonomic dysfunction)
        ↓
Disrupts postural stability system
        ↓
Brain interprets postural instability as VESTIBULAR MISMATCH
        ↓
Patient experiences DIZZINESS / VERTIGO
        ↓
Clinician sees VESTIBULAR PATTERN
        ↓
But underlying cause is NON-VESTIBULAR

How to Correctly Frame This As Audiologist/Vestibular Specialist

Bottom Line — Direct Answer to Both Questions

BP/Pulse Check:

Yes — mandatory. Given low HRV on Holter, this patient almost certainly has orthostatic hemodynamic instability. It takes 5 minutes and will either confirm a treatable cause or redirect to vestibular/neurological workup. It is the highest yield, lowest cost test you can do at the bedside.

Postural Vestibular Syndrome:

Technically incorrect label for this patient. He has vestibular symptoms triggered by posture — which superficially resembles postural vestibular syndrome — but the underlying mechanism is neurological (seizure/vascular/autonomic). As a vestibular specialist, your role is to recognize that this does not fit a clean vestibular diagnosis, document the red flags, and refer. The vestibular findings are secondary and reactive, not primary.

Final Synthesis — Complete Diagnosis

All Available Information

The Unified Diagnosis

CORE DIAGNOSIS:
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
CEREBRAL SMALL VESSEL DISEASE (SVD)
with MULTISYSTEM MANIFESTATIONS
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

CEREBRAL SMALL VESSEL DISEASE
              │
    ┌─────────┼──────────┬───────────┬────────────┐
    ▼         ▼          ▼           ▼            ▼
LACUNAR    CORTICAL   CENTRAL    COCHLEAR     EPILEPTIC
INFARCTS   IRRITATION AUTONOMIC  ISCHEMIA     FOCUS
    │         │        FAILURE       │            │
    ▼         ▼          ▼           ▼            ▼
Postural   Focal      Low HRV    Left SNHL   Focal Motor
Tremor/    Motor      RMSSD      Sloping     Seizure +
Instability Seizure   12.9ms     Moderate    Todd's Palsy
                         │                       │
                         ▼                       ▼
                  Orthostatic HR          Leg shivering =
                  dysregulation          ICTAL activity
                  Tachycardia            Cannot stand =
                  episodes               POSTICTAL

Final Diagnosis List — In Order of Certainty

🔴 Confirmed / Definite

🟡 Highly Probable

🟢 Possible / Cannot Exclude

❌ Effectively Ruled Out

How Each Symptom Is Now Explained

Management Summary

Neurology (Priority 1)

Cardiology / Autonomic (Priority 2)

Audiology / Vestibular (Priority 3)

One Paragraph Summary

Satya Dev Prasad, 50M, presents with multisystem manifestations of cerebral small vessel disease. The primary structural pathology is lacunar infarct disease causing: (1) focal structural epilepsy with ictal leg/hand tremor and postictal Todd's paresis explaining the standing intolerance; (2) central autonomic dysfunction evidenced by severely reduced HRV (RMSSD 12.9ms) and dysregulated tachycardia on Holter; (3) left cochlear ischemia causing moderate sloping SNHL; and (4) secondary vestibular hypofunction. What initially appeared as orthostatic tremor, POTS, or Meniere's disease is unified under a single vascular etiology. Immediate priorities are seizure control with levetiracetam, orthostatic vital signs assessment, and aggressive secondary stroke prevention. The left SNHL requires independent investigation to exclude co-existing endolymphatic hydrops.

Final Vestibular Diagnosis — Blinded to Neurology

Available Information Only

Reasoning Process — As Vestibular Specialist

Step 1: What Type of Vestibular Syndrome Is This?

Step 2: Peripheral or Central?

Step 3: Apply Red Flag Filter

Final Diagnosis — As Vestibular Specialist

PRIMARY VESTIBULAR DIAGNOSIS:
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

PERSISTENT POSTURAL PERCEPTUAL DIZZINESS (PPPD)
Secondary to Left Peripheral Vestibular Hypofunction

WITH

Left Chronic Peripheral Vestibular Hypofunction
(Probable Vascular Etiology — Left Cochlear/Labyrinthine Ischemia)

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Why PPPD Fits Best — Diagnostic Criteria Check

Barany Society PPPD Criteria (2017)

Supporting Diagnoses

What Does NOT Fit Any Clean Vestibular Diagnosis

Official Vestibular Report Conclusion

VESTIBULAR SPECIALIST REPORT
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Patient: Satya Dev Prasad | 50M | Duration: 3–4 months

VESTIBULAR IMPRESSION:
Chronic postural dizziness consistent with PPPD
precipitated by left peripheral vestibular hypofunction
of probable vascular etiology.

AUDIOLOGICAL FINDING:
Left moderate sloping SNHL — vascular cochlear
ischemia most likely; endolymphatic hydrops
cannot be excluded.

AUTONOMIC FINDING (Holter):
Severely reduced HRV (RMSSD 12.9ms)
Autonomic dysfunction contributing to
orthostatic hemodynamic instability.

⚠️ RED FLAGS — BEYOND VESTIBULAR SCOPE:
→ Bilateral limb tremor (hand + leg)
→ Central autonomic failure pattern
→ Tachycardia episodes (1hr 14min)
→ Vascular age/risk profile

RECOMMENDED INVESTIGATIONS:
□ Orthostatic BP + HR (lying/sitting/standing)
□ vHIT — quantify left canal hypofunction
□ cVEMP + oVEMP — saccular/utricular function
□ ECochG — exclude endolymphatic hydrops
□ Glycerol dehydration test
□ CDP (Computerized Dynamic Posturography)

REFERRAL:
→ Neurology — bilateral tremor, vascular risk,
   autonomic dysfunction
→ Cardiology — Holter findings, tachycardia
→ Internal Medicine — orthostatic hypotension,
   secondary stroke prevention

VESTIBULAR REHABILITATION:
Initiate PPPD protocol ONLY after neurological
clearance — graded exposure, gaze stabilization,
postural desensitization.

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

One Line Final Diagnosis

PPPD secondary to left peripheral vestibular hypofunction (vascular), with autonomic dysfunction contributing to orthostatic instability — bilateral limb tremor and central autonomic failure require urgent neurological evaluation beyond vestibular scope.

Final Vestibular Diagnosis

Primary Diagnosis

Contributing Factor

Red Flag — Refer Neurology

Left ear problem
      ↓
Vestibular system destabilized
      ↓
Brain never fully compensated
      ↓
PPPD developed over 3–4 months
      +
Autonomic dysfunction making
standing hemodynamically unstable
      +
Limb tremor = neurological cause
beyond vestibular scope

"Chronic postural dizziness from left vestibular loss, complicated by autonomic instability — refer neurology for limb tremor."

Vestibular Clinical History