Benign paroxysmal positional vertigo showing sequential translations of four types of nystagmus

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• 作者：Takao Imai^a ; ^{imaitakao@hotmail.com} ; Noriaki Takeda^b ; Atsuhiko Uno^a ; Arata Horii^c ; Tadashi Kitahara^d ; Suetaka Nishiike^a ; Kayoko Higashi-Shingai^e ; Hidenori Inohara^a
• 关键词：Benign paroxysmal positional vertigo ; Apogeotropic ; Geotropic ; Three dimensional ; Rotation vector
• 刊名：Auris Nasus Larynx
• 出版年：2012
• 期刊代码：29_03858146
• 类别：med
• 出版时间：October, 2012
• 卷：39
• 期：5
• 页码：544-548
• 文件大小：807 K

摘要

Objective

We report a case of benign paroxysmal positional vertigo (BPPV) showing sequential translation of four types of nystagmus and discuss its pathophysiology.

Methods

The case was 65-year-old female. We analyzed her nystagmus three-dimensionally.

Results

At the first visit, she showed vertical-torsio nystagmus of the posterior canal type of BPPV (P-BPPV) and subsequently showed recently reported geotropic nystagmus with a long time constant. Two weeks later, she showed apogeotropic nystagmus of the horizontal canal type of BPPV (AH-BPPV) and subsequently a geotropic nystagmus with a short time constant of the horizontal canal type of BPPV (GH-BPPV).

Conclusions

Three kind of nystagmus, namely P-BPPV, AH-BPPV and GH-BPPV can be explained by the otoconial debris hypothesis of the same ear. Finally, the recently reported geotropic nystagmus with a long time constant may be explained by a reversible lesion such as the denatured cupula or utricular imbalance of the same ear.