Browsing by Author "Novoa, Iván"

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    Alteraciones de las vías centrales relacionadas con el utrículo en los pacientes con vértigo posicional paroxístico benigno
    (2024) Waissbluth Abarca, Sofía; Oyarzun Angulo Javier Andres; Novoa, Iván; Viñuela Morales, Macarena Rocío; Cordano Guajardo, Valentina Paz
    Introducción: Otoconias en los canales semicirculares, desprendidas de los órganos otolíticos, podría ser la causa del vértigo posicional paroxístico benigno (VPPB). Formas de evaluar el utrículo incluyen la subjetiva visual vertical (SVV) y el potencial miogénico evocado vestibular ocular (oVEMP). Objetivos: Evaluar SVV y oVEMP en pacientes con VPPB, antes y después de la maniobra de reposición (MRP). Materiales y Métodos: Estudio prospectivo, caso-control. Se reclutaron pacientes con VPPB (canal semicircular posterior), y controles pareados por edad y sexo. Se realizó SVV y oVEMP. Se ejecutó la MRP y se repitió SVV y oVEMP inmediatamente, y a la semana. Se evaluó el nivel de discapacidad con la escala Dizziness Handicap Inventory (DHI) y del mareo con la escalavisual analógica (EVA); ambos realizados pre- y post-MRP. Resultados: Trece pacientes completaron el estudio (48,8 años, 53,8% mujeres). El puntaje DHI y EVA bajaron postMRP. El 53,8% presentó alteración en SVV, 71,4% presentó mayor desviación hacia el lado contralateral al VPPB. A la semana post-MRP, 4/13 presentaron desviación, pero en menor grado y unilateral. Se observó una correlación positiva entre la SVV y DHI. Todos presentaron respuesta bilateral en oVEMP, 4/13 presentaron asimetría inicialmente, y ninguno post-tratamiento. No se observó correlación entre oVEMP y DHI o EVA.
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    Bilateral Vestibulopathy. What Can the Video Head Impulse Test Tell Us?
    (2025) Waissbluth Abarca, Sofía; Viñuela Morales, Macarena Rocío; Escobedo Durán, Emilia José; Pastore, Antonia; Novoa, Iván
    Bilateral vestibulopathy (BV) is a known cause of chronic vestibular syndrome. With the video head impulse test (VHIT), we can now evaluate all six semicircular canals independently and establish BV subgroups based on canal gain patterns. Background/objectives: To assess canal gain patterns for BV with VHIT, and evaluate subgroups with regard to sex, age, and hearing loss. Methods: A retrospective chart review was performed of all patients who underwent a VHIT between January 2021 and July 2024. Patients with decreased lateral canal gains, bilaterally, were included. Results of canal gains, VHIT patterns, audiometry, and videonystagmography (VNG) results were reviewed. Results: 101 cases were included. Patients were 75.5 ± 13.1 years old and 64.4% were women.Various VHIT patterns were observed; the most frequent being decreased canal gains across all six canals (44.6%), followed by a mix of canals with decreased gains with no clear pattern (34.7%). Decreased gains limited to the lateral canals were rare. We did not observe any significant difference between subgroups with regard to gender or age. Concomitant hearing loss was common (89.6%). A trend was noted, suggesting that severity of hearing loss increased with the number of affected canals. An abnormal VNG test was common (73.3%).
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    Bilateral Vestibulopathy. What Can the Video Head Impulse Test Tell Us?
    (2025) Waissbluth Abarca, Sofía; Viñuela Morales, Macarena Rocío; Escobedo Durán, Emilia José; Pastore, Antonia; Novoa, Iván
    Bilateral vestibulopathy (BV) is a known cause of chronic vestibular syndrome. With the video head impulse test (VHIT), we can now evaluate all six semicircular canals independently and establish BV subgroups based on canal gain patterns. Background/objectives: To assess canal gain patterns for BV with VHIT, and evaluate subgroups with regard to sex, age, and hearing loss. Methods: A retrospective chart review was performed of all patients who underwent a VHIT between January 2021 and July 2024. Patients with decreased lateral canal gains, bilaterally, were included. Results of canal gains, VHIT patterns, audiometry, and videonystagmography (VNG) results were reviewed. Results: 101 cases were included. Patients were 75.5 ± 13.1 years old and 64.4% were women.Various VHIT patterns were observed; the most frequent being decreased canal gains across all six canals (44.6%), followed by a mix of canals with decreased gains with no clear pattern (34.7%). Decreased gains limited to the lateral canals were rare. We did not observe any significant difference between subgroups with regard to gender or age. Concomitant hearing loss was common (89.6%). A trend was noted, suggesting that severity of hearing loss increased with the number of affected canals. An abnormal VNG test was common (73.3%).
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