What is lateral canal BPPV?
Benign paroxysmal positional vertigo, commonly called BPPV, is a vestibular disorder caused by small calcium carbonate particles moving into one of the semicircular canals of the inner ear. When the head changes position, these particles shift and create a false sense of motion. The most common form involves the posterior canal, but the lateral canal, also called the horizontal canal, is involved in a significant number of cases.
Lateral canal BPPV typically causes vertigo when the head is rolled to the side, such as turning over in bed. The vertigo is often intense and may be accompanied by nausea, imbalance, and a horizontal nystagmus that changes direction depending on which way the head is turned.
Diagnosis before treatment
A clinician usually diagnoses lateral canal BPPV using a supine roll test. The patient lies flat with the head supported, and the head is turned quickly to one side and then the other. In lateral canal BPPV, the test produces horizontal, direction-changing nystagmus. The response is often stronger on one side, which helps identify the affected ear.
The nystagmus pattern also helps distinguish between two forms of lateral canal BPPV. In canalolithiasis, the particles are free-floating within the canal. In cupulolithiasis, the particles are attached to the cupula, the sensory structure inside the canal. The distinction matters because the head position used during treatment may need to be adjusted.
What is the Appiani maneuver?
The Appiani maneuver is a canalith repositioning procedure designed for lateral canal BPPV. It uses controlled head and body movements to move displaced calcium carbonate particles away from the sensitive part of the horizontal semicircular canal and back into the utricle, where they can be reabsorbed or no longer cause symptoms.
Several descriptions of the Appiani maneuver exist, and the exact sequence is often tailored to the affected ear and to whether the BPPV is the geotropic or apogeotropic type. The maneuver is generally considered a liberatory technique rather than a slow roll, because it involves a rapid change from sitting to a side-lying position. The quick movement is intended to shift the debris in a specific direction using inertia and gravity.
How the Appiani maneuver is performed
The Appiani maneuver should be performed by a qualified clinician, especially during the initial treatment session. A typical treatment follows a general pattern.
- The patient begins sitting upright on a firm treatment surface with the legs resting comfortably.
- The clinician reviews the positional test results to confirm which ear is affected and which form of lateral canal BPPV is present.
- The patient is then moved rapidly into a side-lying position. The side chosen and the angle of the head depend on the affected ear and the type of nystagmus.
- The patient remains in this position briefly while the clinician monitors for nystagmus or vertigo.
- The head and body are then moved through the next position in the sequence, often with a further rotation before the patient is brought back to sitting.
- The clinician repeats a positional test to determine whether the maneuver was effective.
Because the starting side and head position are critical, this technique should not be attempted by a patient without a professional assessment. A wrong head position can move the particles in the wrong direction and make symptoms worse.
After the maneuver
After a successful Appiani maneuver, many patients feel immediate relief, but some feel unsteady for a short time. The clinician may advise the patient to remain upright for the rest of the day, avoid bending forward, and sleep with the head slightly elevated. These precautions give the particles time to settle after being moved out of the canal.
Some patients need more than one session. If the Appiani maneuver does not fully resolve the vertigo, other lateral canal repositioning techniques may be considered, including the Gufoni maneuver, the barbecue roll, or other clinician-guided positional releases.
Why the Appiani maneuver is useful
Lateral canal BPPV can be difficult to treat with maneuvers designed for the posterior canal. The Appiani maneuver offers a targeted option for the horizontal canal because it uses a side-lying movement that matches the orientation of that canal. It is usually quick, well tolerated, and can be repeated if necessary. Most importantly, it is guided by the clinician's observation of the nystagmus response, which helps ensure that the correct ear and head position are selected.
Keywords
- Lateral canal BPPV
- Horizontal canal BPPV
- Benign paroxysmal positional vertigo
- Appiani maneuver
- Canalith repositioning
- Vertigo
- Geotropic nystagmus
- Apogeotropic nystagmus