Noise Induced Hearing LoosNoise Induced Hearing LoosKelompok 13

IntroducingIntroducingEnvironmental noise is a common cause of hearing loss in

industrialized societies. Hearing loss that is caused by the noise exposure due to recreational or nonoccupational activities is termed socioacusis. Hearing loss due to injurious noise at workplace is referred to as occupational noise-induced hearing loss (ONIHL). The term acoustic trauma means the hearing loss due to single exposure to intense sound.ONIHL is a more common cause of noise-induced hearing loss (NIHL) and much more serious problem than socioacusis for the following 2 reasons: (1) The threat of loss of employment may convince people to remain in environments with noise levels higher than they would otherwise accept, and (2) in the workplace, high levels of noise may be sustained on a regular basis for many hours each day over many years.

Pathophysiologyexposed to noise for a

long time

Rupture of reissner membrane

Direct damage at sterocilia in hair cell Death of hair cell

disturbance impulse formation

no impulses are transmitted to the brain

Deafness

vibration could not be delivered to the scale of the media and organ corti

Clinical ManifestationThe first difficulty the patient

usually notices is trouble understanding speech when a high level of ambient background noise is present.

NIHL progresses, individuals may have difficulty understanding high-pitched voices (eg, women's, children's) even in quiet conversational situations.

HipotesisHipotesisNoise Induced Hearing LossPresbiacusis

AudiometriAudiometri

Interpretasi:• AC & BC <25 dB berhimpit tuli sensorineural

• Grafik terus menurun sampai frekuensi 3000 Hz lalu kembali naik pada frekuensi 4000 Hz gambaran khas tuli sensorineural yang disebabkan oleh bising dimana

terjadi kenaikan ambang dengar

Derajat ketulian:

500 Hz+1000 Hz+2000

Hz+4000 Hz 4

= 35 dB (tuli sedang)

Dasar Diagnosis• Sulit mendengar percakapan di

keramaian• Volume TV maksimal baru bisa

mendengar• Riwayat pekerjaan sebagai mekanik perusahaan tekstil selama 30 tahun dan tidak

memakai APD (earplug) yang disediakan

• Hasil Audiometri

PrognosisPrognosisAd Vitam : Ad BonamAd Fungsionam : Dubia Ad

MalamAd Sanationam : Dubia Ad

Malam

Daftar PustakaDaftar Pustaka1. Nilan J et al. Occupational hearing loss.

Noise and hearing conservation in occupational medicine,1994: 258-96

2. Ilmu Kesehatan Telinga Hidung Tenggorok. Edisi 6. 2007. Jakarta: Balai Penerbit Fakultas Kedokteran Universitas Indonesia. p.49-52

3. Sanrota R. Tingkat penurunan pendengaran akibat kebisingan pada tenaga kerja Indonesia bagian pertenunan, Universitas Indonesia Jakarta,1992 Tesis Magister