Since 1948, a number of authors have reported gains in bone-conduction sensitivity following fenestration surgery. The average gains reported by McConnell and Carhart,1 Feldman,2 Juers,3 Henner,4 and Nilsson5 are summarized in Table 1. Woods6 reported 39 cases in which the preoperative masked bone conduction was below an average loss of 10 db. for the 3 "conversational frequencies." An average gain for masked bone conduction in these cases following fenestration surgery was 11.4 db. Woods did not report his findings according to frequency. Several factors account for the differences in bone-conduction shifts reported by different authors: (1) Problems associated with the calibration of the bone-conduction oscillators. There is still no American Reference Standard for hearing by bone conduction. Each of the manufacturers tries to approximate "normal" in their calibration of bone-conduction vibrators. (2) Differences in procedures for masking the nontested ear during bone-conduction
MILLER MH, RENDALL J, KALMON M. Bone-Conduction Changes Following Audiosurgery: Changes in Ears Operated On and Not Operated On with Fenestration and Stapes Mobilization Surgery. Arch Otolaryngol. 1961;74(2):213–219. doi:10.1001/archotol.1961.00740030218017
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