JOURNAL ARTICLE

[Diagnosis and treatment of canal conversion during canalith repositioning procedure for benign paroxysmal positional vertigo]

H M Huang, Y Huang, Y Cui, R M Ge, M Fu
Journal of Clinical Otorhinolaryngology, Head, and Neck Surgery 2018 June 5, 32 (11): 816-818
29921048
Objective: To investigate the diagnosis and treatment of canal conversion during canalith repositioning procedure for benign paroxysmal positional vertigo. Method: The clinic features, nystagmus characteristics, diagnosis and treatment of the patients with benign paroxysmal positional vertigo who suffered from canal conversion during canalith repositioning procedure were analyzed retrospectively.All patients'positioning test and canalith repositioning procedure were done with the aid of videonystagmography. Result: A total of 186 patients with benign paroxysmal positional vertigo were diagnosed and performed canalith repositioning procedure.Eight patients (4.3%) developed canal conversion after canalith repositioning procedure.Of these 8 patients,5 cases with posterior canal canalolithiasis converted to lateral canal canalolithiasis,2 cases with lateral canal canalolithiasis converted to posterior canal canalolithiasis,and 1 case with posterior canal canalolithiasis converted to anterior canal canalolithiasis. All cases recovered well under the corresponding repositioning procedure. Conclusion: The change of the characteristics of positioning nystagmus is the major diagnostic feature of canal conversion. Accurate diagnosis and targeted repositioning procedure are the key to the success of canal conversion treatment.

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