Keywords: lateral canal BPPV; horizontal canal BPPV; apogeotropic nystagmus; ageotropic nystagmus; Gufoni maneuver; cupulolithiasis; canalith repositioning; positional vertigo.
Lateral canal BPPV: a brief overview
Benign paroxysmal positional vertigo, or BPPV, is a common vestibular disorder in which displaced calcium carbonate crystals, called otoconia, move into a semicircular canal of the inner ear. The posterior canal is affected most often, but the lateral, or horizontal, semicircular canal is also involved in a substantial number of individuals. This subtype is called lateral canal BPPV or horizontal canal BPPV.
In lateral canal BPPV, brief rotational vertigo is typically triggered by rolling the head from side to side, for example when turning over in bed. The abnormal movement of otoconia within the long arm of the lateral canal, or the adhesion of otoconia to the ampullary cupula, produces a horizontal nystagmus that can be observed during diagnostic positional testing.
Geotropic and apogeotropic patterns
Two clinical patterns of lateral canal BPPV are recognised according to the direction of observed nystagmus during the supine roll test. When the patient lies supine with the head turned to one side, nystagmus that beats toward the lowermost ear is described as geotropic. This pattern usually indicates free-moving particles within the posterior limb of the lateral canal. When the nystagmus beats toward the uppermost ear, away from the ground, the pattern is called apogeotropic or ageotropic.
The apogeotropic variant often reflects cupulolithiasis, meaning otoconia are attached to or resting on the cupula of the lateral canal. Less commonly, particles may lie in the anterior limb of the canal. Because the crystals remain in contact with the cupula, the resulting nystagmus is persistent rather than brief and may be direction-changing when the head is moved from side to side.
Why Gufoni for the apogeotropic variant?
Several repositioning treatments can be used for lateral canal BPPV, including the barbecue roll and the Gufoni maneuver. The Gufoni maneuver is a short, highly effective liberatory technique originally designed for lateral canal involvement. It is often tried as a first-line treatment in the apogeotropic pattern because it avoids multiple full rotations of the head and neck.
The goal of the Gufoni maneuver is to create a sudden inertial movement of the inner ear fluid and then to reposition the head so that gravity assists the misplaced otoconia in returning to the vestibule, where they no longer stimulate the canal with every head movement. For apogeotropic lateral canal BPPV, the maneuver is modified to address the anterior location of the crystals and their attachment to the cupula.
The Gufoni maneuver for apogeotropic lateral canal BPPV
The following description is intended for clinical awareness only. The maneuver should be performed by a qualified clinician who has confirmed the diagnosis and has checked for cervical spine or vascular contraindications. Patients should not attempt this technique unsupervised.
Although many treatment centres describe small variations, the apogeotropic form is generally treated with the following sequence:
- The patient sits upright on an examination bed with legs extended and arms resting comfortably.
- The clinician quickly guides the patient into a side-lying position on the side opposite the affected ear. This places the affected ear uppermost and helps expose the anterior limb of the lateral canal to gravity.
- After remaining in this position for a short period, usually 30 to 60 seconds, the clinician gently rotates the patient's head such that the face is turned toward the ceiling. This upward rotation is maintained for one to two minutes or until the provoked nystagmus resolves.
- The clinician then returns the head to a neutral position and slowly returns the patient to a seated position.
- The patient usually remains upright for a few minutes while the clinician observes eye movements and checks for residual symptoms.
Some protocols use a slightly different first step, such as starting with the head turned slightly toward or away from the affected side. The selection of the correct starting direction depends on the side of the lesion and the exact nystagmus pattern. For this reason, clinicians are advised to refer to step-by-step practical videos or established clinical guidelines before performing the maneuver.
After the maneuver
Following a successful Gufoni maneuver for apogeotropic lateral canal BPPV, the patient may feel immediate improvement, but some drowsiness or transient disequilibrium is possible. Patients are usually advised to wait before rising, to move the head slowly for the next 24 to 48 hours, and to avoid sleeping with the affected ear downward if this aggravates symptoms. A post-treatment supine roll test can be used to confirm that the apogeotropic nystagmus has resolved.
If one attempt does not relieve the vertigo, the maneuver may be repeated or alternative repositioning strategies, such as the barbecue roll or the Semont-style liberatory procedure, may be considered. Persistent BPPV should prompt further assessment by a health professional experienced in vestibular disorders.