Caloric test results and damaged semicircular canal in benign positional paroxysmal vertigo

Revista da Sociedade Brasileira de Fonoaudiologia

Ganança, Maurício Malavasi¹  Ganança, Fernando Freitas¹  Manso, Andréa¹  Caovilla, Heloisa Helena¹  Ganança, Cristina Freitas¹ 

关键词: Ear;    Inner;    Semicircular canals;    Dizziness;    Vertigo;    Electronystagmography;    Caloric tests/methods;   

DOI  :  10.1590/S1516-80342009000100015

来源: Sociedade Brasileira de Fonoaudiologia

【 摘 要 】

PURPOSE: To characterize caloric test results in benign paroxysmal positional vertigo patients, according to the damaged semicircular canal.METHODS: The data of 1033 patients submitted to Dix-Hallpike testing, positional nystagmus and electronystagmography were analyzed. Caloric test results were compared to the damaged semicircular canals and were submitted to statistical analysis.RESULTS: In cases with posterior canal damage, there was prevalence of normal responses compared to abnormal results (p<0.0001); hypo activity was more prevalent than hyperactivity (p<0.0001) and directional preponderance (p<0.0001), and hyperactivity more prevalent than directional preponderance (p<0.0001). In cases with lateral canal damage, normal responses were more prevalent than hypo activity (p<0.0001) and hyperactivity (p<0.0001); there was a tendency of prevalence of hypo activity over hyperactivity (p=0.0771), and directional preponderance was not observed. In cases with anterior canal damage, normal responses were more prevalent than hypo activity (p<0.0001); hyperactivity and directional preponderance were not observed.CONCLUSION: In the caloric test of benign positional paroxysmal vertigo patients, normal responses, hypo activity, hyperactivity or directional preponderance of post-caloric nystagmus occur in decreasing order of prevalence when the posterior canal is damaged; normal responses are more prevalent than hypoactive or hyperactive caloric responses, and there is a tendency of prevalence of hypoactive over hyperactive caloric responses when the lateral canal is damaged; normal responses are more prevalent than hypoactive caloric responses when the anterior canal is damaged.

【 授权许可】

Unknown