Above is a VNG tracing of a patient with right horizontal canal canalithiasis (BPPV). The patient develops right-beating nystagmus when laying on their right side which is greater than the left-beating nystagmus that develops when the head is turned to the left side. Thus, this is called geotropic nystagmus and represents BPPV involving the right horizontal semicircular canal.
Below is a video animation (from Dr. Tim Hain, Northwestern University) illustrating the basic head movement needed to treat this type of BPPV. This maneuver has been called 'log roll', 'BBQ roll' and 'Lempert roll' and is over 90% curative for this condition.
Below is a video of a patient with left horizontal canal BPPV being treated with a Lempert roll. Horizontal canal BPPV is cured over 90% of the time with a single treatment.