Elevated Endolymph Volume Drives Recurrent Vertigo
Untreated Meniere's means excess inner-ear fluid, frequent attacks.
- 4–8/mo: Typical episode frequency (untreated baseline)
- ~130%: Endolymph volume (relative to normal)
- 20 min–24 h: Attack duration (per episode)
- Low-freq: Hearing loss pattern (fluctuating, early disease)
Endolymphatic hydrops overview
Excess endolymph swells the membranous labyrinth, disrupting balance and hearing signals.
Why fluid volume matters
Systemic fluid retention is thought to raise inner-ear fluid pressure.
First-line management targets whole-body fluid, not just the ear.
Low-Sodium Diet Reduces Systemic Fluid Retention
Cutting dietary sodium lowers whole-body fluid retention gradually.
- <1500–2000: Target sodium intake (mg / day)
- ~3400: Typical Western intake (mg / day)
- 2–4 wks: Onset of benefit (consistent adherence)
- ~60%: Reported responders (improve on diet alone)
Mechanism of dietary sodium restriction
Less dietary sodium means less water retained in the bloodstream.
Adherence matters most
Benefit scales with how consistently intake stays low.
Even moderate reduction can measurably ease symptoms over time.
Hydrochlorothiazide Boosts Renal Sodium and Water Excretion
A thiazide diuretic adds active renal fluid clearance to diet.
- HCTZ: First-line diuretic (often + triamterene)
- Distal tubule: Mechanism (blocks Na+/Cl- reabsorption)
- 25 mg: Typical dose (once daily, titrated)
- +15–20%: Added to diet alone (extra responders)
How thiazides lower fluid volume
Blocking renal sodium reabsorption pulls more water into urine.
Combining with diet
Diuretic effect is layered on top of sodium restriction.
Diet plus diuretic together outperform either alone.
Systemic Fluid Reduction Gradually Lowers Endolymph Volume
Weeks of combined therapy slowly reduce inner-ear fluid pressure.
- 4–8 wks: Time to inner-ear effect (lag behind systemic change)
- ~20–30%: Endolymph volume drop (toward normal range)
- Monthly: Monitoring interval (symptom + electrolyte check)
- K+, Na+: Electrolytes to monitor (thiazide side effect risk)
Systemic-to-inner-ear lag
Body fluid drops first; ear fluid follows over several weeks.
Tracking progress
Episode diaries and audiometry track gradual improvement.
Consistency over months matters more than any single week.
Episode Frequency and Severity Typically Decline
Most adherent patients see fewer, milder attacks within months.
- 1–3 mo: Response window (for symptom reduction)
- ~50–80%: Attack frequency drop (in responders)
- ~20–30%: Non-responders (need added therapy)
- Betahistine, injections: Next-line options (if lifestyle fails)
Expected trajectory
Frequency and severity trend downward with sustained adherence.
Not universally effective
Some patients need escalation beyond diet and diuretics.
Low-salt diet plus diuretic remains the standard first step.