Something New for the Audiogram Alternative Symbol Developed for Response at Limit

摘要

Since the inception of modern audiometry, infrequent but persistent instances show a patient responding consistently at the lowest audiometric setting. These thresholds have been marked using the standard symbols.The Massachusetts Eye and Ear Infirmary Department of Audiology (MEEI) began reexamining these occurrences after the recent description of Superior Semicircular Canal Dehiscence and other "third-window" phenomena, where hyper-sensitivity to bone conduction is seen (c.f. Rosowski, et al. Otology and Neurotology 25(3):323-32). MEEI started using an extension of the standard symbols consisting of an upward arrow for designating "Response at Limit" (Fig. 1).