Is the severe vertigo and right‑eye visual disturbance after a chlorthalidone overdose with hypokalemia and hyponatremia related to the earlier upper‑right‑jaw dental implant removal?

The Severe Vertigo and Eye Symptoms Are Most Likely Due to Chlorthalidone Overdose with Electrolyte Disturbances, Not the Dental Implant Removal

The extreme vertigo and right-eye visual disturbance following chlorthalidone overdose with hypokalemia and hyponatremia are directly attributable to the electrolyte crisis, while the mild, transient vertigo after dental implant removal was likely benign paroxysmal positional vertigo (BPPV) that had already resolved before the drug overdose occurred.

Understanding the Timeline and Causality

The clinical sequence here is critical:

• Day 1-2 post-dental procedure: Mild vertigo lasting 1-2 days, which resolved
• Later: Chlorthalidone overdose with severe electrolyte derangements
• After overdose: Extreme vertigo with right-sided predominance and eye symptoms ("exploding")

These represent two distinct clinical events with different mechanisms and severity profiles.

The Dental Implant Connection: Minimal and Resolved

The initial mild vertigo following upper jaw implant removal was likely BPPV caused by mechanical disruption during the procedure. When dentists "dig into the bone" during difficult extractions, the vibration and manipulation can dislodge otoconia (calcium carbonate crystals) in the inner ear 1. However, this typically:

• Causes mild to moderate positional vertigo
• Resolves within 1-3 days (as occurred in this patient)
• Does not cause visual disturbances or unilateral eye symptoms
• Does not worsen over time after resolution

The fact that this vertigo resolved before the chlorthalidone overdose strongly argues against any ongoing connection.

The Chlorthalidone Overdose: The True Culprit

Electrolyte Disturbances and Neurological Symptoms

Chlorthalidone is particularly potent at causing severe electrolyte derangements 2. The FDA label explicitly warns that hypokalemia and hyponatremia can cause dizziness and vertigo 3. In overdose with documented hypokalemia and hyponatremia, the patient experienced:

Severe hypokalemia effects:

• Muscle weakness and fatigue
• Neurological dysfunction including vertigo
• Cardiac arrhythmias (which can cause dizziness)

Severe hyponatremia effects:

• Central nervous system dysfunction
• Cerebral edema (can cause visual disturbances)
• Altered mental status
• Severe neurological symptoms even with minimal clinical presentation 4

The Eye Symptoms: A Critical Clue

The "exploding" right eye sensation is particularly telling. Chlorthalidone can cause uveal effusion syndrome with:

• Acute angle-closure glaucoma
• Severe eye pain and pressure
• Visual disturbances
• Myopic shift
• Headache and vertigo

A 2021 case report 5 documented a patient who developed bilateral uveal effusion with headache, vertigo, and reduced visual acuity just 3 days after starting chlorthalidone. The symptoms completely resolved after discontinuing the medication. This matches your patient's presentation remarkably well.

Why the Right Side Predominates

The right-sided predominance of symptoms (right ear vertigo, right eye symptoms) in the context of systemic electrolyte disturbances likely reflects:

1. Individual anatomical vulnerability: Some patients have asymmetric susceptibility to metabolic disturbances
2. Pre-existing subclinical differences: The earlier dental trauma may have created minor inflammation or increased local sensitivity on the right side, making that area more susceptible to metabolic insults
3. Uveal effusion: Can be asymmetric or more symptomatic on one side 5

However, this does not mean the dental procedure caused the severe symptoms—it may have simply created a "weak point" that became symptomatic under metabolic stress.

Clinical Management Priorities

Immediate actions:

1. Correct electrolyte abnormalities aggressively:

   • Potassium replacement (oral or IV depending on severity)
   • Careful sodium correction (no faster than 6-8 mEq/L per 24 hours to avoid osmotic demyelination)
   • Monitor magnesium (chlorthalidone also causes hypomagnesemia 2)

2. Ophthalmologic evaluation urgently if eye symptoms persist:

   • Check intraocular pressure
   • Assess for angle-closure glaucoma
   • Evaluate for uveal effusion

3. Discontinue chlorthalidone permanently 3, 5

4. Monitor for resolution: Symptoms should improve as electrolytes normalize, typically within days to weeks

Common Pitfalls to Avoid

• Don't attribute severe, persistent symptoms to the resolved BPPV: The mild post-dental vertigo had already resolved
• Don't underestimate chlorthalidone's potency: It causes more severe hypokalemia than hydrochlorothiazide (HR 2.72) 2
• Don't ignore eye symptoms: These require urgent evaluation for angle-closure glaucoma
• Don't correct sodium too rapidly: Risk of osmotic demyelination syndrome
• Don't restart chlorthalidone: Switch to alternative antihypertensive if needed

The Bottom Line

The severe vertigo and eye symptoms are complications of chlorthalidone overdose with electrolyte crisis, not delayed effects of dental implant removal. The dental procedure caused transient, mild BPPV that resolved. The subsequent severe symptoms represent a distinct medical emergency requiring aggressive electrolyte correction and possible ophthalmologic intervention 3, 5.