Patho: -most common cause of pathologic vertigo
-usually develops after the fourth decade of life
-brief periods of vertigo, usually lasting less than 1 minute, that are precipitated by a change of head position
-commonly occurs in bed when the person rolls into a lateral position, bending over and straightening up, extending the head to look up, getting in and out of bed, or sudden twist or turn of the head
-people with BPPV have movement of otoliths from the utricle into the endolymph of the semicircular canal that continue to move even when the head is stationary, these movements cause the vestibular system to be more
-usually there is a several second delay between head movement and onset of vertigo
-symptoms usually subside with continued movement due to the movement causing the debris to be redistributed throughout the endolymph system and away from the posterior semicircular canal
(Norris, 2020, p. 531-532)
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