A Case of Benign Paroxysmal Positional Vertigo (BPPV) During the Canalith Repositioning Procedure (CRP).

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  • 頭位変換療法中に眼振の変化したＢＰＰＶ例　　方向交代性上向性眼振例
  • リンショウ トウイ ヘンカン リョウホウ チュウ ニ ガンシン ノ ヘンカ シタ BPPVレイ ホウコウ コウタイセイ ウワムキセイガンシンレイ
  • ―方向交代性上向性眼振例―

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Abstract

Apogeotropic direction-changing positional nystagmus is considered to appear in patients with disorders of the central nervous system. However, this peculiar nystagmus is more likely to be caused by peripheral vestibular disorder. The mechanism of apogeotropic direction-changing positional nystagmus can be explained by benign paroxysmal positional vertigo (BPPV) caused by cupulolithiasis in the horizontal semicircular canal.<br>We used the canalith repositioning procedure (CRP) in a patiant with apogeotropic direction-changing positional nystagmus diagnosed as BPPV, and observed the change from upper-beating nystagmus to down-beating nystagmus during the procedure. The change in the direction of nystagmus seemed to indicate the dispersion of otolithic debris from the cupula, that is to say, the conversion of cupulolithiasis to canalolithiasis. We observed the disappearance of nystagmus and vertigo after three days.

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