How should vertigo occurring during or immediately after an intravitreal (ocular) injection be managed?

Vertigo During or After Intravitreal Injections: Management

Vertigo occurring during or immediately after intravitreal injection is most commonly a transient caloric-type response from fluid entering the eye and should be managed conservatively with reassurance and observation, as it typically resolves within minutes to hours without intervention.

Understanding the Mechanism

The vertigo experienced during ocular injections is typically a brief, self-limited phenomenon caused by:

• Acute intraocular pressure spike from fluid injection
• Mechanical stimulation of the eye
• Vasovagal response to the procedure
• Rarely, a caloric-like vestibular response

This is distinct from true vestibular pathology and does not represent BPPV, Ménière's disease, or other primary vestibular disorders described in the guidelines 1.

Immediate Management Algorithm

During the Injection:

1. Stop the injection immediately if patient reports severe vertigo or spinning
2. Keep patient supine or reclined to prevent falls
3. Assess for associated symptoms:
   • Loss of consciousness (suggests vasovagal response)
   • Severe nausea/vomiting
   • Neurologic symptoms (weakness, speech changes, vision loss beyond expected)
   • Chest pain or palpitations

Immediate Post-Injection (First 30-60 Minutes):

• Observation period: Have patient remain seated/reclined until symptoms resolve
• Reassurance: Explain this is a common, self-limited response
• Monitor vital signs if vasovagal component suspected
• Do NOT administer vestibular suppressants (antihistamines, benzodiazepines) for this transient response 2, 3

Red Flags Requiring Further Evaluation

Seek immediate evaluation if:

• Vertigo persists beyond 1-2 hours
• Associated with severe headache, focal neurologic deficits, or vision changes beyond expected post-injection effects
• Patient has difficulty walking or severe imbalance after observation period
• Symptoms suggest stroke (consider HINTS examination if trained) 4

When Vertigo Persists Beyond Initial Period

If vertigo continues for >2 hours or recurs over days:

1. Differentiate true vertigo from other dizziness 1:

   • True vertigo = spinning/rotational sensation
   • Lightheadedness = presyncope (not vestibular)
   • Imbalance = unsteadiness without spinning

2. Assess duration and pattern 1:

   • Seconds with position change → Consider BPPV (perform Dix-Hallpike maneuver) 3
   • 20 minutes to 12 hours with hearing changes → Consider Ménière's disease 1
   • Persistent >24 hours → Consider vestibular neuritis or central causes 1

3. Perform targeted examination:

   • Dix-Hallpike maneuver if positional 3
   • Check for nystagmus pattern
   • Assess hearing (audiometry if fluctuating hearing loss present) 1
   • Neurologic examination for central signs 4

Prevention Strategies for Recurrent Episodes

For patients who experience vertigo with repeated injections:

• Minimize injection volume when possible
• Slower injection technique to reduce acute IOP spike 5, 6
• Consider smaller gauge needles (though evidence is mixed)
• Pre-procedure counseling about transient symptoms
• Ensure adequate anesthesia to reduce anxiety/vasovagal component
• Extended observation period for high-risk patients

Common Pitfalls to Avoid

1. Do not routinely prescribe vestibular suppressants (meclizine, diazepam) for transient post-injection vertigo 2, 3 - these medications:

   • Are not indicated for brief, self-limited symptoms
   • Can cause sedation and increase fall risk
   • May interfere with central compensation if true vestibular injury occurred

2. Do not obtain imaging for isolated brief vertigo without neurologic signs 4 - the yield is extremely low and not cost-effective

3. Do not assume all post-injection vertigo is benign - rare complications like retinal vascular occlusion can present with dizziness 7, so maintain clinical vigilance for:

   • Persistent vision changes
   • Severe pain
   • Systemic vasculopathic risk factors

4. Do not confuse transient injection-related vertigo with BPPV - BPPV requires specific positional triggers and lasts seconds, not the continuous sensation during/immediately after injection 3

Patient Education

Inform patients before injection:

• Brief dizziness or spinning sensation may occur during or immediately after injection
• This typically resolves within minutes to an hour
• They should remain seated until symptoms clear
• Report persistent symptoms (>2 hours) or associated neurologic changes
• This does not indicate a serious complication in most cases

For patients with systemic vascular risk factors (hypertension, diabetes, cardiovascular disease), maintain heightened awareness as they may be at slightly higher risk for rare vascular complications 7, though causality remains uncertain.