Horizontal Canal BPPV Apogeotropic: Rethinking Treatment

Most of us were taught and continue to be taught that sustained apogeotropic nystagmus indicates cupulolithiasis when the lateral canal is involved.

But what if that’s not usually true?

In this blog I want to take you on a brief journey and challenge what we’ve traditionally been taught about these presentations. 

Understanding Horizontal Canal BPPV

I think that we can all agree that when positional testing (i.e. Supine Roll, Dix-Hallpike, Sidelying, Bow & Lean) produces horizontal nystagmus, we are most often dealing with horizontal canal BPPV. It’s important to remember that positional nystagmus can also be seen with conditions such as light cupula or central causes.

The classic presentation:

• Geotropic, unsustained nystagmus
  → Posterior arm canalithiasis
  → Affected side = more symptomatic side 

Treatment is typically straightforward:

• BBQ Roll
• Gufoni
• Zuma
• Li maneuver

Most clinicians are comfortable here.

Important Distinction: Sustained Geotropic Nystagmus

Before discussing apogeotropic horizontal canal BPPV, an important clinical point:

Sustained geotropic nystagmus is not BPPV, but is more consistent with a light cupula phenomenon.

If you see persistent, non-fatiguing geotropic nystagmus, reconsider your diagnosis.

👉 Check out this blog on light cupula for more details and to this YouTube video for a video demonstration.

The Traditional View of Apogeotropic Horizontal Canal BPPV

This is where we may need to reconsider our current framework as most clinicians are taught:

• Apogeotropic nystagmus = cupulolithiasis 
• Treatment requires liberatory techniques first 

Convert cupulolithiasis → canalithiasis → then treat accordingly

This is the standard framework in many vestibular courses.

A Different Perspective on Apogeotropic BPPV

That was how I approached it until several years ago when I attended an online course by Dr. R. Clendaniel through Educational Resources Inc that challenged my thinking in that with horizontal canal BPPV, apogeotropic presentations are not always cupulolithiasis.

Rather, apogeotropic nystagmus can result from either: 

• Cupulolithiasis (less common)
• Anterior arm canalithiasis (more common)

This distinction is supported in the literature (Lee & Kim, 2010; Riga et al., 2013).

Dr. Timothy Hain also outlines that ~75% of the time lateral canal canalithiasis involves the posterior arm, while ~25% involves the anterior arm. 

Given that canalithiasis is far more common overall, it is reasonable to consider that many apogeotropic cases may be anterior arm canalithiasis, not cupulolithiasis.

This simple anatomical distinction often explains why the same canal can produce two very different nystagmus patterns. This shift in perspective has important implications for how we treat these patients.

To better understand this, it helps to visualize the lateral (horizontal) canal as a slightly tilted tube with two segments. The posterior arm is the more gravity-dependent portion when the patient is supine and connects toward the utricle. This is where otoconia most commonly settle (~75% of the time). The anterior arm is the segment closer to the ampulla and cupula, positioned slightly higher and more anterior. The location of otoconia within these two regions determines the direction of endolymph flow during positional testing, and therefore the direction of nystagmus. Posterior arm involvement produces geotropic nystagmus, while anterior arm involvement produces apogeotropic nystagmus. Understanding Ewald's 3 Laws also helps determine which ear is affected in both geotropic and apogeotropic presentations. 

Why Can Apogeotropic Nystagmus Be Sustained?

Great question, but unfortunately this currently remains unclear.

Possible explanations include:

• Endolymph flow dynamics
• Influence of the velocity storage mechanism in the lateral canal

At this time, this is still one of the unanswered questions in vestibular science.

Clinical Implication: Are We Over-Treating?

If we assume all horizontal canal BPPV apogeotropic presentations are cupulolithiasis, we often:

• Add unnecessary liberatory steps
• Increase treatment time
• Increase patient discomfort

A Simpler Treatment Strategy

Step 1: Identify the Affected Side

With apogeotropic horizontal canal BPPV:

• Supine Roll → less symptomatic side = affected ear 
• Lean Test → nystagmus beats toward affected side 

Step 2: Reposition Otoconia (Anterior → Posterior Arm)

Instead of focusing on liberatory techniques:

1. Roll onto the affected side first (consider a slight nose-down position to optimize the effect)
2. Return to supine 

Or,

1. Perform the Gufoni technique, lying on affected side, followed by turning the head upwards. 
2. Return to sitting 

👉 This helps move debris from the anterior arm into the posterior arm 

Step 3: The Technique Matters Less Than the Goal

Some clinicians prefer the Gufoni maneuver, while others use the BBQ roll. Both can be effective. Mechanistically, the key is that the patient:

• Lies onto the affected side → debris moves laterally
• Patient looks up → debris migrates posteriorly

The Key Takeaway

The goal is not to “break debris off the cupula”. It is to move it into the posterior arm. 

A Note on the Zuma Maneuver

The Zuma maneuver is particularly useful in horizontal canal BPPV cases.

Once the affected ear is identified:

The Zuma maneuver can treat: 

• Posterior arm canalithiasis
• Anterior arm canalithiasis
• Cupulolithiasis

This makes it an efficient, versatile option when:

• The mechanism is uncertain
• You want a single maneuver that covers multiple possibilities (similar to how the Semont maneuver can address multiple posterior canal variants)

 Step 4: Continue Treatment

Once debris is in the posterior arm:

• Perform BBQ Roll away from affected ear or perform the Gufoni laying on the unaffected ear, then turning the head down. 
• Re-test, then treat again if indicated. 

Clinical Decision Flow

• Geotropic + Unsustained → Posterior arm canalithiasis → Treat
• Geotropic + Sustained → Light cupula → Not BPPV
• Apogeotropic → Assume anterior arm canalithiasis first
• Treat
• Reassess
• If no change → consider cupulolithiasis

What About “Conversion”?

If geotropic becomes apogeotropic:

This may occur if the incorrect ear is treated.

The reverse is also true:

• Apogeotropic → geotropic can occur rapidly
• Often without liberatory techniques

This has been described in clinical studies of horizontal canal BPPV (Ramos et al., 2019).

Final Thoughts

Horizontal canal BPPV doesn’t have to feel complicated.

We may just be overcomplicating how we interpret apogeotropic nystagmus. 

If you begin treating horizontal canal BPPV apogeotropic presentations as anterior arm canalithiasis first, you may see:

• Faster conversions
• Faster resolution
• More efficient care

This clinical insight has changed how I approach these cases, and I hope it helps you manage these presentations more efficiently and confidently.

A Note on Clinical Application

If you’d like to see this approach applied clinically:

We offer a 0.5-hour online course that includes:

• A real patient case
• Infrared video demonstrating sustained apogeotropic nystagmus converting to unsustained geotropic nystagmus in real time with the BBQ Roll.  
• Step-by-step clinical reasoning and treatment
• Course certificate included
• Lifetime access

Subscribers to our monthly email updates receive 20% preferred pricing on courses like this.

References 

1. Lee SH, Kim JS. Benign paroxysmal positional vertigo. J Clin Neurol. 2010.
2. Riga M, et al. Apogeotropic variant of horizontal canal BPPV. Otol Neurotol. 2013.
3. Ramos BF, et al. Apogeotropic variant of HC-BPPV: Where are the particles? Int Arch Otorhinolaryngol. 2019.
4. Zuma e Maia F. Treatment strategies for apogeotropic HC-BPPV.
5. Hain TC. Horizontal canal BPPV. Available at: https://dizziness-and-balance.com