Is there a high risk of hearing loss in canal occlusion surgery for bppv vertigo? is it total hearing loss or only some?

Probably no loss: Bppv is the result of loose otoconia (ear stones) in the inner ear. This disease as its name suggests is benign. If you have a dehiscence of a canal (superior semicircular canal), that is a more serious problem and is not bppv. However, the surgery to occlude a canal should not cause a hearing loss. The location of the canal is not that close to the cochlea. However, there is always a risk.