Questions and Concerns About Canalith Repositioning Maneuvers for Benign Paroxysmal Positional Vertigo

Benign paroxysmal positional vertigo (BPPV) is the most common cause of vertigo in clinical practice, accounting for approximately 20–30% of all dizziness cases. It arises from dislodged otoconia—calcium carbonate crystals normally embedded in the utricular macula—that migrate into one or more of the semicircular canals, most frequently the posterior canal. When head position changes, these free-floating particles shift within the canal, triggering abnormal endolymphatic flow and resulting in brief, intense episodes of rotational vertigo, often accompanied by nystagmus and nausea.

Canalith repositioning maneuvers—such as the Epley maneuver for posterior canal BPPV or the Lempert (barbecue) roll for horizontal canal involvement—are first-line, non-invasive therapeutic interventions. These techniques rely on gravity-assisted sequential head movements to guide displaced otoconia out of the affected semicircular canal and back into the utricle, where they either re-adhere or are resorbed. Success rates exceed 80% after one or two sessions when performed correctly by trained clinicians.

However, several critical factors influence efficacy: accurate diagnosis via Dix–Hallpike or supine roll testing is essential to confirm canal involvement and rule out central causes; patient-specific considerations—including cervical spine limitations, severe hypertension, or recent retinal detachment—may contraindicate certain maneuvers; and proper technique execution—including precise angles, timing, and duration of each position—is vital to avoid canal switching or symptom exacerbation. Incomplete resolution may necessitate repeat maneuvers, adjunct vestibular rehabilitation, or referral for further evaluation if atypical features persist.