Tymps
Tymp Types
Tymp Types/ Decay
Reflexes
OAEs
100

Probe stimulus for children?

1000 Hz

100

Type As

- what does it correlate with?

- admittance, ECV, pressure?

  • Can correlate with otosclerosis

  • Small admittance
  • Normal ECV
  • Normal pressure
100

Type C

- what does it correlate with?

- admittance, ECV, pressure?

  • Can correlate with ET dysfunction or beginning or end of EM

  • Normal admittance
  • Normal ECV
  • Negative pressure
100

Ipsi reflexes: afferent and efferent happen where

  • Ipsi: afferent and efferent on same side
100

when do you test OAEs?

noise-induced hearing loss and ototoxicity

200

Purpose of tymps

cross-check pure tones

200

Type Ad

- what does it correlate with?

- admittance, ECV, pressure?

  • Can correlate with ossicular chain disarticulation

  • Large admittance
  • Normal ECV
  • Normal pressure
200

what are we looking for in amplitude with decay?

  • looking to see if the amplitude will reduce by 50% in 10 seconds
200

Contra reflexes: afferent and efferent happen where

afferent opposite side, efferent same side

200

When are OAEs always absent?

> 40 dB

300

Norms for Admittance: adults and peds


  • Adults: 0.3-1.5 mmho
  • Pediatrics: 0.2-0.9 mmho
300

Type B: normal ECV

- what does it correlate with?

- admittance, ECV, pressure?

  • otitis media w/ effusion or perforated TM with a tumor behind it


  • No admittance
  • No pressure
  • ECV varies
300

how should decay be administered?

  • ASD is administered contralaterally
  • Present 10 dB above ASR threshold for 10 sec.
300

Input- CN? sensory/motor?

Output- CN? sensory/motor?

input- CN 8, sensory

output- CN 7,sensory

300

TEs SNR should be what to be present?

  • SNR > 3 dB
400

Norms for pressure: adults and peds

  • Adults: -150- 50 daPa
  • Pediatrics: -150- 50 daPa
400

Type B: small ecv

- what does it correlate with?

- admittance, ECV, pressure?

  • occluded wax or blocked probe tip

  • No admittance
  • No pressure
  • ECV varies
400

what does a positive decay mean?

  • Retrocochlear lesion (7th or 8th CN)
400

two functions of reflexes

  • Protections from loud sounds
  • Improves speech perception (HPF)
400

DPs SNR should be what to be present?

  • SNR > 6 dB
500

Norms for ECV: adults and peds

  • Adults: 0.3-1.5 ml
  • Pediatrics: 0.2-0.9 ml
500

Type B: large ECV

- what does it correlate with?

- admittance, ECV, pressure?

  • perf or PE tubes


  • No admittance
  • No pressure
  • ECV varies
500

if there is a positive decay, is it in the probe or activator ear?

  • Results reference the ACTIVATOR ear
500

what freq. tested for ipsi reflexes?

what freq. tested for contra reflexes?

ipsi: 500- 4,000 Hz

contra: 500-2,000 Hz

500

presentations levels for DPOAEs?

F1 65 dB

F2 55 dB

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