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Am J Otolaryngol. 2017 Sep - Oct;38(5):521-525. doi: 10.1016/j.amjoto.2017.03.016. Epub 2017 Apr 1.

Clinical and audiological characteristics of 1000Hz audiometric notch patients.

Author information

1
Department of Otorhinolaryngology-Head and Neck Surgery, Pusan National University School of Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea.
2
Department of Otorhinolaryngology-Head and Neck Surgery, Pusan National University School of Medicine, Pusan National University Hospital, Busan, Republic of Korea.
3
Department of Otorhinolaryngology-Head and Neck Surgery, Pusan National University School of Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea. Electronic address: entgate@gmail.com.

Abstract

PURPOSE:

Among the hearing loss patients, we can confirm that the hearing loss of the specific frequency decreases, such as the 2000Hz notch in otosclerosis and the 4000Hz notch (c5-dip) in noise-induced hearing loss. The 1000Hz notch (c3-dip), however, is rarely studied. We fortuitously encountered a group of patients with a 1kHz hearing loss and report it with a review of the literature.

METHODS:

Otological history, audiogram, diagnosis, occupation, and history of noise exposure were reviewed from charts and telephone interview, and compared between c3-dip and c5-dip patients (n=98).

RESULTS:

Thirty-one patients (mean age: 46.2years) demonstrated 1kHz hearing loss; these included 11 males. The pure-tone threshold was 37.97dB at 1kHz and the average threshold was 22.38dB at other frequencies. In the c3-dip group, tinnitus was the most common complaint, while sudden sensorineural hearing loss and idiopathic tinnitus (n=8 each) were the most common diagnoses. Female patients and unilateral cases were more common in the c3-dip than in the c5-dip group, and ear fullness was more common in the c3-dip group than in the c5-dip group. The duration of occupation-related noise exposure was longer in the c5 group, and head or ear trauma was more frequent in the c3-dip group.

CONCLUSION:

We have defined a new clinical entity of 1kHz hearing loss in patients, defined as the c3-dip, which was clinically and audiologically distinct from the c5-dip. Further study is needed to clarify this new entity of hearing loss.

KEYWORDS:

Audiometric notch; Head trauma; Pure tone audiometry

PMID:
28532971
DOI:
10.1016/j.amjoto.2017.03.016
[Indexed for MEDLINE]

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