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BRAINSTEM EVOKED RESPONSE AUDIOMETRY (BERA), AUDIOTORY BRAINSTEM RESPONSE (ABR)
The document discusses the auditory pathway, detailing how electrical activity in the cochlear nuclei and other structures generates auditory responses, influenced by stimulus characteristics like click sounds. It outlines the timing parameters for normal and abnormal auditory processing, including interpeak latencies and wave morphology, which are used to assess the integrity of auditory pathways. Various neural generators from the cochlear nerve to the auditory cortex are identified, with emphasis on the role of synchronization and physiological measurements.
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BRAINSTEM EVOKED RESPONSE AUDIOMETRY (BERA), AUDIOTORY BRAINSTEM RESPONSE (ABR)
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- 13. Processing at differentlevels Generates electrical activity Monitored by surface electrode Graphic recording presents a waveform with discrete peaks Depends on the functional integrity of the pathway DR.GIRISH.S
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- 18. Click sounds – stimulatesbasal part earlier than apex Velocity of travelling wave higher in the basal part. BM at base is more taut & narrow. Strong neural synchrony at the basal part (high frequency part) Larger component of BERA response. DR.GIRISH.S
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- 41. Wave Site ofNeural Generator I Cochlear nerve (distal end) II Cochlear nerve ( proximal end) III Cochlear nucleus IV Superior Olivary Complex V Lateral Leminiscus & Inferior Colliculus VI & VII Not definitely known DR.GIRISH.S
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- 73. Parameter measured Normalvalue (ms) Criteria for abnormality (ms) I to III IPL 2 More than 2.4 III to V IPL 2 More than 2.4 I to V IPL 4 More than 4.4 Interaural difference of wave V Less than 0.3 More than 0.3 Morphology of wave V Present Absent DR.GIRISH.S
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- 123. Large AN arising fromI/L 8th nerve compressing brainstem on C/L side. DR.GIRISH.S
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