摘要
The ear drums of 279 long-range gunners and 156 short-range gunners who hadparticipated in a battle for 4 months were inspected and 442 ears were subjected to acousticimpedance measurement.The results showed that retraction was the main change of the ear drums,then,opacity and atrophy.The average static compliance was 1.06,tympanograms were 75.6% oftype A and 21.1% of AD.No obvious difference in acoustic reflex threshold at different frequencieswas found between the 2 sorts of gunners.But the short-range cannon gunners suffered a more seri-ous high frequency hearing loss.
The ear drums of 279 long-range gunners and 156 short-range gunners who had participated in a battle for 4 months were inspected and 442 ears were subjected to acoustic impedance measurement.The results showed that retraction was the main change of the ear drums, then,opacity and atrophy.The average static compliance was 1.06,tympanograms were 75.6% of type A and 21.1% of AD.No obvious difference in acoustic reflex threshold at different frequencies was found between the 2 sorts of gunners.But the short-range cannon gunners suffered a more seri- ous high frequency hearing loss.
