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Pseudo-spontaneous nystagmus increases Bow and Lean Test accuracy

OBJECT: The aim of this study was to evaluate the effectiveness of the Bow and Lean Test (BLT) based on nystagmus intensity and direction evaluation (NID-BLT) in the diagnosis of benign paroxysmal positional vertigo of the lateral semicircular canal (LSC-BPPV). We hypothesised that the presence of a...

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Autores principales: Faralli, Mario, Di Giovanni, Alfredo, Ciacca, Giacomo, Zambonini, Giulia, De Bernardo, Erica, Marcelli, Vincenzo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Pacini Editore Srl 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8283397/
https://www.ncbi.nlm.nih.gov/pubmed/34264921
http://dx.doi.org/10.14639/0392-100X-N1136
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author Faralli, Mario
Di Giovanni, Alfredo
Ciacca, Giacomo
Zambonini, Giulia
De Bernardo, Erica
Marcelli, Vincenzo
author_facet Faralli, Mario
Di Giovanni, Alfredo
Ciacca, Giacomo
Zambonini, Giulia
De Bernardo, Erica
Marcelli, Vincenzo
author_sort Faralli, Mario
collection PubMed
description OBJECT: The aim of this study was to evaluate the effectiveness of the Bow and Lean Test (BLT) based on nystagmus intensity and direction evaluation (NID-BLT) in the diagnosis of benign paroxysmal positional vertigo of the lateral semicircular canal (LSC-BPPV). We hypothesised that the presence of a pseudo-spontaneous nystagmus increases the diagnostic accuracy of the test. METHODS: The BLT was performed in 32 subjects affected by LSC-BPPV. RESULTS: BLT was positive in 27 cases with a sensitivity of 84.3% and an accuracy of 70.4%. In other words, it was possible to carry out a BPPV root canal diagnosis (LSC) with BLT in 27 patients, of whom 19 also received a diagnosis of side and form. Pseudo-spontaneous nystagmus was detected in 15 patients, all of whom were BLT positive. In these patients, a clear diagnosis of form and side was also obtained in 14 cases (accuracy 93.3%). In the 12 patients without pseudo-spontaneous nystagmus and BLT positive, a diagnosis of side and form was reached in 5 cases (accuracy 41.6%). The comparison between percentages (Chi square test) showed a significant difference (p = 0.038). CONCLUSIONS: The presence of a pseudo-spontaneous nystagmus, as an expression of more mobile debris within the canal or a more deflectable cupula, increases the accuracy of the BLT.
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spelling pubmed-82833972021-07-30 Pseudo-spontaneous nystagmus increases Bow and Lean Test accuracy Faralli, Mario Di Giovanni, Alfredo Ciacca, Giacomo Zambonini, Giulia De Bernardo, Erica Marcelli, Vincenzo Acta Otorhinolaryngol Ital Vestibology OBJECT: The aim of this study was to evaluate the effectiveness of the Bow and Lean Test (BLT) based on nystagmus intensity and direction evaluation (NID-BLT) in the diagnosis of benign paroxysmal positional vertigo of the lateral semicircular canal (LSC-BPPV). We hypothesised that the presence of a pseudo-spontaneous nystagmus increases the diagnostic accuracy of the test. METHODS: The BLT was performed in 32 subjects affected by LSC-BPPV. RESULTS: BLT was positive in 27 cases with a sensitivity of 84.3% and an accuracy of 70.4%. In other words, it was possible to carry out a BPPV root canal diagnosis (LSC) with BLT in 27 patients, of whom 19 also received a diagnosis of side and form. Pseudo-spontaneous nystagmus was detected in 15 patients, all of whom were BLT positive. In these patients, a clear diagnosis of form and side was also obtained in 14 cases (accuracy 93.3%). In the 12 patients without pseudo-spontaneous nystagmus and BLT positive, a diagnosis of side and form was reached in 5 cases (accuracy 41.6%). The comparison between percentages (Chi square test) showed a significant difference (p = 0.038). CONCLUSIONS: The presence of a pseudo-spontaneous nystagmus, as an expression of more mobile debris within the canal or a more deflectable cupula, increases the accuracy of the BLT. Pacini Editore Srl 2021-07-07 2021-06 /pmc/articles/PMC8283397/ /pubmed/34264921 http://dx.doi.org/10.14639/0392-100X-N1136 Text en Società Italiana di Otorinolaringoiatria e Chirurgia Cervico-Facciale, Rome, Italy https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article distributed in accordance with the CC-BY-NC-ND (Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International) license. The article can be used by giving appropriate credit and mentioning the license, but only for non-commercial purposes and only in the original version. For further information: https://creativecommons.org/licenses/by-nc-nd/4.0/deed.en
spellingShingle Vestibology
Faralli, Mario
Di Giovanni, Alfredo
Ciacca, Giacomo
Zambonini, Giulia
De Bernardo, Erica
Marcelli, Vincenzo
Pseudo-spontaneous nystagmus increases Bow and Lean Test accuracy
title Pseudo-spontaneous nystagmus increases Bow and Lean Test accuracy
title_full Pseudo-spontaneous nystagmus increases Bow and Lean Test accuracy
title_fullStr Pseudo-spontaneous nystagmus increases Bow and Lean Test accuracy
title_full_unstemmed Pseudo-spontaneous nystagmus increases Bow and Lean Test accuracy
title_short Pseudo-spontaneous nystagmus increases Bow and Lean Test accuracy
title_sort pseudo-spontaneous nystagmus increases bow and lean test accuracy
topic Vestibology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8283397/
https://www.ncbi.nlm.nih.gov/pubmed/34264921
http://dx.doi.org/10.14639/0392-100X-N1136
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