Аннотация:Objective The present study aimed to determine the time course and frequency patterns of transient low‐tone air‐bone gaps (ABGs) after canal plugging for intractable BPPV. Method We investigated 8 patients with intractable BPPV who underwent canal plugging. Four cases had posterior semicircular canal type BPPV (pBPPV), and the other 4 had horizontal semicircular canal type BPPV (hBPPV). Pure‐tone audiometries (PTAs) were performed before surgery and 7 days, 1 month, and 6 months after surgery. Results The ratio of the number of patients with ABGs (+) was 100.0% (8/8) on the 7th day and 1st month postoperatively, and it was 0.0% (0/8) in the 6th month postoperatively. There were no significant differences in the time course or frequency patterns of ABGs between pBPPV and hBPPV. Conclusion Our findings suggest that, during such a convalescence period, the plugged area might not be completely repaired yet and could still induce dizziness and low‐tone ABGs, since enlarged vestibular aqueduct syndrome and superior semicircular canal deficiency syndrome exhibit low‐tone ABGs because of a third mobile window into the inner ear.
