Clinical Characteristics of Patients with Persistent Apogeotropic and Persistent Geotropic Direction-Changing Positional Nystagmus

Abstract

Background and Purpose This study aimed to determine the clinical features, diagnosis, and treatment of patients with persistent geotropic (pG) and persistent apogeotropic (pAG) direction-changing positional nystagmus (DCPN). Methods This retrospective study included 30 patients with pG-DCPN and 44 patients with pAG-DCPN. All patients underwent neurological and neurotological examinations, including an evaluation of gaze-evoked nystagmus, eye-movement tests, and assessments of limb ataxia and balance, as well as magnetic resonance imaging to exclude central causes. The characteristics of positional nystagmus were detected using the supine roll test (SRT) and bow-and-lean test (BLT). The null point (NP) at which the nystagmus disappeared was determined. All patients were treated with the barbecue maneuver, and treatment efficacy was evaluated immediately, 1 week, and 1 month after treatment. Results The history of diseases associated with atherosclerosis, peripheral vestibular disorders, otological disease, and migraine differed significantly between patients with pG-DCPN and pAG-DCPN. The affected sides of persistent horizontal DCPN can be determined using the SRT and the BLT, while determining the second NP and vestibular function as well as performing an audiological evaluation can be used to assist in identifying the affected side. The efficacy rates immediately and 1 week after treatment with the barbecue maneuver were higher in patients with pAG-DCPN than in patients with pG-DCPN. Conclusions pAG-DCPN was more compatible with the characteristics of cupulolithiasis, and pG-DCPN was more likely to be associated with a light cupula rather than canalolithiasis. pAG-DCPN was more likely to be accompanied by a disease associated with atherosclerosis, while pG-DCPN was often accompanied by autoimmune-related diseases and a history of migraine. The associations between pAG-DCPN, pG-DCPN, and the above-mentioned diseases need to be clarified further. The canalith-repositioning maneuver was effective in patients with pAG-DCPN and ineffective in patients with pG-DCPN, but most cases of pG-DCPN are self-limiting.

Cupulolithiasis: A Critical Reappraisal

“…Others have noted that the nystagmus of cupulolithiasis should be lower velocity than with freely moving particles, which have a mechanical advantage in moving the cupula due to a plunger‐like effect 44,51,65,77 . Case studies of jam show peak velocities exceeding 50 d/s, as high as those found with geotropic/canalithiasis H‐BPPV, 33 and nystagmus velocities as high as 80°/s have been reported, 78 which is not consistent with experimental models of cupulolithiasis in which peak velocities are 1/3 those of canalithiasis 44 …”

Vestibular migraine: epidemiology, pathogenesis, clinical picture, diagnosis and treatment

“…Авторы исследования полагают, что рецидивирующее ДППГ может быть манифестацией мигрени со стороны внутреннего уха -«отомигрени», включающей кохлеарные, вестибулярные и кохлеовестибулярные симптомы [34]. Наконец, показано, что персистирующий геотропный меняющий направление позиционный нистагм ассоциирован с аутоиммунными заболеваниями и анамнезом мигрени [35]. В отношении взаимосвязи ВМ и ДППГ интересны данные о частом выявлении дефицита 25-гидроксивитамина D в плазме крови у пациентов с ВМ [36].…”

Clinical characteristics and lateralization of the horizontal semicircular canal light cupula

“…Moreover, spontaneous nystagmus is believed to stem from the upward deflection of the cupula, causing it to beat toward the unaffected side ( 8 , 15 ). In the bow and lean test (BLT), 83–100% of patients with light cupula present with bow nystagmus and/or lean nystagmus ( 4 , 9 , 16 ). The fast phase direction of bow nystagmus corresponds to the affected side of the light cupula ( 4 , 9 ).…”

“…In the bow and lean test (BLT), 83–100% of patients with light cupula present with bow nystagmus and/or lean nystagmus ( 4 , 9 , 16 ). The fast phase direction of bow nystagmus corresponds to the affected side of the light cupula ( 4 , 9 ). However, lean nystagmus is the opposite of bow nystagmus ( 16 , 17 ).…”

“…However, lean nystagmus is the opposite of bow nystagmus ( 16 , 17 ). Additionally, the evoked nystagmus in the supine position occurs in 80–90% of patients ( 9 , 18 ). Most supine positioning nystagmus are directed toward the unaffected side ( 9 , 11 , 18 ).…”