Mean preoperative air-bone gaps
were calculated by subtracting bone-conduction thresholds from air-conduction thresholds at 500, 1,000, 2,000, and 4,000 Hz.
For each of the 10 patients, pre- and postoperative air- and bone-conduction thresholds and air-bone gaps
were determined at frequencies of 500, 1,000, 2,000, and 4,000 Hz with speech discrimination testing.
Her Rinne test was positive at 512 and 1,024 Hz, and audiometry revealed closure of the air-bone gap
, as the air-conduction PTA was 21 dB and the bone-conduction PTA was 14 dB.
We comparedpre- and postoperative air-bone gaps
(ABGs) in each group, as well as the differences between these gaps among the three groups.
On preoperative pure tone audiometry, air-bone gaps
were 24, 25, 38, and 33 dB.
Postoperative audiometry showed closure of the air-bone gaps
in both ears.
Their air-bone gaps
on pure-tone audiometry ranged from 20 to 45 dB (mean: 31.