Evoked response audiometry
The Evoked Reaktionsaudiometrie ( ERA , engl .: evoked response audiometry) is a generic term for various methods for objective measurement of hearing . ERA measures the potential of the inner ear, the auditory pathway , the brain stem (or brain stem) and the cerebral cortex .
The ERA includes the following procedures:
- ECochG (measures the potential of the snail and the auditory nerves )
- BERA (measures the potential of the brain stem)
- CERA (measures the potential of the cerebral cortex)
This means that ERA is not a separate measurement method, but a collective term for various measurement methods. The methods mentioned above therefore differ in terms of the location of the measurements (snail, auditory pathways, brain stem, cerebral cortex).
ERA: evoked response audiometry; "evoked response" → "evoked response", d. H. For example, the snail is exposed to sound or stimulated by clicking, and the snail then reacts to this with potentials or "vibrations" (to put it simply), which are measurable, these are the "evoked responses"
ECochG : electrocochleography ; "cochlea" → snail
BERA : brainstem electrical response audiometry; "brainstem" → brain stem ; d. H. "Vibrations" of the brain stem are measured ("brainstem electrical response" → "electrical responses of the brain stem")
CERA : cortical evoked response audiometry; "cortical" → concerning the cerebral cortex
The following table lists the advantages and disadvantages of the methods:
| Procedure | Benefits | disadvantage |
|---|---|---|
| ECochG | - good signal-to-noise ratio - even in sleep, sedation and anesthesia feasible - maturing influence can be taken into account |
- invasive and labor-intensive - only the function of the inner ear and auditory nerve is recorded - only limited frequency-specific |
| BERA | - non-invasive - functional testing of the auditory nerve and brain stem - can also be carried out during sleep, sedation and anesthesia - the influence of maturation can be taken into account |
- frequency-specific only to a limited extent - cortical function is not recorded |
| CERA | - non-invasive - functional testing down to the cortical level - frequency-specific testing possible |
Findings strongly dependent on brain maturation and level of alertness (cannot be used in small children) |
swell
- ↑ Giessen University Hospital - Audiometry