{Reference Type}: Journal Article
{Title}: Pre- and post-operative semicircular canal function evaluated by video head impulse test in patients with vestibular schwannoma.
{Author}: Fujiwara K;Morita S;Motegi H;Yamaguchi S;Ishi Y;Hoshino K;Fukuda A;Kobayashi M;Nakamaru Y;Fujimura M;Homma A;
{Journal}: Auris Nasus Larynx
{Volume}: 51
{Issue}: 3
{Year}: 2024 Jun 26
{Factor}: 2.119
{DOI}: 10.1016/j.anl.2024.03.001
{Abstract}: <B>OBJECTIVE: </B>To evaluate pre- and post-operative semicircular canal function in patients with vestibular schwannoma (VS) by the video Head Impulse Test (vHIT).<BR><B>METHODS: </B>Nineteen patients with VS who underwent surgery were enrolled in this study. The gain in vestibulo-ocular reflex (VOR) and the degree of scatter in catch-up saccades were examined pre- and post-operatively for the semicircular canals in VS patients.<BR><B>RESULTS: </B>Ten of 19 cases (52.6 %) with VS were defined as demonstrating both superior vestibular nerve (SVN) and inferior vestibular nerve (IVN) impairment from the results of pre-operative vHIT. Hearing level and subjective vestibular symptoms showed significant correlations with pre-operative semicircular canal function. Compared to pre-operative vHIT results, VOR gains within 1 month after surgery were significantly reduced in all three canals; however, significant differences had disappeared in the anterior and posterior semicircular canals at 6 months after surgery. Cases of unknown origin had a significantly greater reduction in posterior semicircular canal function after surgery compared with those with disease of IVN origin.<BR><B>CONCLUSIONS: </B>As vHIT could evaluate pre-operative vestibular nerve impairment, post-operative VOR gain reduction and the degree of vestibular compensation, semicircular canal function evaluated by vHIT provides a good deal of useful information regarding VS patients undergoing surgery compared to caloric testing, and vHIT should be performed pre- and post-operatively for patients with VS.