Background: Bemgn positional vertigo (BPV) is en acterized by episodic vertigo and nystagmus provoked by head I iV Jts f~have been major advances in the understanding of this common condition. We evaluated clinical features FA,of BPV patients in a multicenter stady.
;analyzed clinical features of 1474 parients who had befen diagnosed as having BPV in seven dizziness
´I´l i ; diagnosis of BPV was based on the typical nystagmus concurrent with vertigo elicited by t~;;,l~ uvcr According to the semicircular zonal involved, we classified BPV into posteri or, hori zontal, and
t/lr;y, The horizontal BPV was subdivided into geotropic and apogeotropic types according to the 01yf1 h;; head turning while lying down.
Ir,tie )ts included 1002 women and 472 Tnem Mean age of the patients was 55.2 with no difference YLL y~st~~ ;~tyvl men. Posterior (61.5%) and horizortal (32.0%) semicircular canals were most conunonly involved.
s ),),,V was subdivided into 61.5% of zeouopic and 31.5% of apogeotropic types. Most patients were
+A tl e patients (89.9%) were succe:461ly treated with canalith repositioning procedure (CRP).
);JN may involve each of the thr serrtieircular canals. The involved canal can be identified by
~I) the nystagmus induced by Hallpi e nr"uver or head turning in supine position. The horizontal
irt,tty Il y involved than previously known. High success rate of CRP is expected only when different
ap [lied to each patient depending on the canal involved.
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