耳鼻喉科Otolaryngology topic nine: Audiology

Audiology

1. Treatment plan:
-- sensory↓: surgical  treatment
-- conduction↓: medical treatment

2. Cochlear
-- scala vestibuli, scala media(Organ of Corti), scala tympani
-- apex-->low pitch; base-->high pitch

3. Audiogram (test average hearing threshold)
-- frequency: 500, 1000, 2000, 4000 Hz
-- amplitude: start from loud sounds
-- unit: dB SPL or dB HL over Hz
-- new machine in Taiwan:  S1-S10, from good to bad function, start from the level of S5

4. Hearing aids
-- BTE
-- ITE
-- ITC
-- CIC

5. Tuning fork tests
-- 512 Hz
-- Weber test: midline, test sound transmission through bones
-- Rinne test: compare air conduction and bone conduction

6. Tympanogram: external ear canal pressure change--> check tympanic membrane's movement

7. Acoustic reflex
-- CN8--bilateral superior olive-->CN7-->stapes m.

8. Auditory brainstem response (ABR)
-- can test threshold and delay(schwannoma)

9. Otoacoustic emission (OAE)

10. Speech reception threshold (SRE)

11.  Conductive hearing loss
-- air-bone gap > 60dB