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Hearing tests :fish: (Auditory Brainstem Response :peach: (Evoked…

- - - - If AC > BC ➯ อาจแปลว่า
        
        normal conducting system/positive or
        
        SNHL
      - If BC > AC ➯ แปลว่า
        Conductive HL/negative
- - - - Pure tone threshold (red dot line)
      - Air conduction (green)
      - Bone conduction (pink)
    - - CHL
        
        Essential criteria
        
        BC must be better than > AC
        
        Air-bone gap must be ≥ 15 dB
        
        BC must be normal or near normal
        
        Discrimination: good
      - SNHL
        
        Criteria
        
        AC & BC threshold are reduced
        
        No air-bone gap
      - Mixed HL
  - - - Minimum conc ของเสียง ที่หูสามารถเริ่มรับฟัง speech ได้ 50%
      - เปรียบเหมือนHearing threshold ของการรับฟังคำพูด
      - :check:Check by Spondee words 2 syllables eg พ่อแม่ รถไฟ
      - Importance :money_with_wings:
        
        Know ความไวหู ต่อคำพูด
        
        Check pure tone threshold
        (will differ fr Pure tone threshold < 15 dB)
    - - Value of Understand the meaning of words
      - :check:Check by Phonetically Balanced Lists 1 syllable @ ความดัง = SRT + 35 dB
        (if plus 35 dB will hear for sure!!)
      - Importance :money_with_wings:
        
        Normal PB% = 90-100%
        
        Low PB% must consider Retrocochlear lesion
        ได้ยินแต่ไม่เข้าใจ vibes
        
        Must decide to choose Hearing Aids
- - - - Shallow amp = :arrow_up: stiffness of middle ear structures
        (eg, Tympanosclerosis)
      - High amp = Abnormally high compliance
        (eg, Ossicular chain eruption)
    - - Type A
      - Type As
      - Type Ad
      - Type C #
      - Type B
    - - Perforated tympanic mb
        (ear canal volume: child > 2cc, adult >2.5cc)
      - :star: Otitis media with effusion :star:
        (nm ear canal volume: child 0.5-1cc, adult 0.6-2cc)
      - Clogged probe tip
        (very small ear canal volume)
    - - Normal tubal func
      - Blocked tube