BAEP Flashcards by Nicholas Rainer

Q

What is the function of bone wax when performing a BAEP?

A

Securing the earphone. ( IT DOES NOT PROTECT THE CANAL FROM FLUID ENTRY)

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Q

Absolute Latency of Wave I?

A

1.4 msec

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Q

Absolute Latency of WIII?

A

3.4 msec

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Q

Absolute Latency of WV?

A

5.5 msec

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Q

Wave I

A

Distal VIIIth Nerve

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Q

WIII

A

Pons, Superior Olivary Complex

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Q

WV

A

Midbrain, Lateral Lemniscus, Inferior Colliculus

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Q

Cz placed in in positive or negative input?

A

positive

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Q

Ai and Ac placed in positive or negative input?

A

Negative

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Q

Auris Sinister (AS)

A

Left Ear

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Q

Auris Dextrous (AD)

A

Right Ear

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Q

Wave I is only recorded in the stimulated ear? True or False

A

True

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Q

White Noise Masking at?

A

60 dB SPL

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Q

Contralateral Channel Function?

A

Validates White Noise Masking is being presented at appropriate intensity
Better identification of Wave V (Better 4-5 split in the contralateral ear)

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Q

Failure to use white noise masking may produce?

A

False Negative meaning the data does not change and the patient awakens with deficit.

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Q

Identification of Wave V may require?

A

Decrease stimulation intensity (by 5 dB HL)

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Q

If you have presence in Cz-A1 and absence in Cz-A2?

A

Technical Issue: Problems with sensitivity or fluid in ear

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Q

Absent Cz-A1 and Presence in Cz-A2?

A

Technical Issue, Cannot be fluid in the ear though because the presence of waves III and V in the contralateral side. Could be fluid in the pod where A1 inserted.

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Q

Kinked Earphone Tubing

A

Increase in Absolute Latency, Normal inter-peak latencies

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Q

Blood, Betadine or Irrigation Fluid in Tubing

A

Increase in Absolute Latency, Normal inter-peak latencies

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Q

Excessive Earwax (Serumen)

A

Increase in Absolute Latency, Normal inter-peak latencies

Q

Perforated or Hardened Tympanic Membrane

A

Increase in Absolute Latency, Normal inter-peak latencies

Q

Middle Ear Infection (Otitis Media)

A

Increase in Absolute Latency, Normal inter-peak latencies

Q

Artificial Ventilation

A

Increase in Absolute Latency, Normal inter-peak latencies

Otosclerosis

Increase in Absolute Latency, Normal inter-peak latencies

Nitrous Oxide

Increase in Absolute Latency, Normal inter-peak latencies

Most important preparation step for BAEP?

Water tight seal of tape over ear

What modality is monitored during cholesteatoma surgery?

Facial Nerve only, CN VII

What modality is monitored during cholesteatoma surgery?

Facial Nerve only, CN VII

What Modality is monitored during Mastoidectomy surgery?

CN VII

What Modality is monitored during tympanoplasty surgery?

CN VII

What modality is monitored during Porus Acusticus Surgery?

CN VII and BAEP

Tinnitus

Ringing in the ear

Meneires Disease Surgery

Endolymphatic Sac Decompression

What modality is monitored during Endolymphatic Sac Decompression Surgery?

CN VII and BAEP

High Frequency Hearing Loss

Normal or near normal at high intensity click stimulation, but at lower intensity stimulation, increased absolute latencies and normal inter-peak latencies

Broad Band Click range

2,000-4,000 Hz

Type of Clicks used in BAEP?

Broad Band Clicks

Presbycusis (definition)

High Frequency hearing loss in old age

Presbycusis

Normal or near normal at high intensity click stimulation, but at lower intensity stimulation, increased absolute latencies and normal inter-peak latencies

Ischemia of the Cochlea

Increase in Absolute Latency, Normal Inter-peak Latencies

Hypothermia

Increase in All Interpeaks: I-III & III-V & I-V

Acoustic Neuroma

Increased I-III, increased I-V inter-peak

Vestibular Schwannoma

Increased I-III, increased I-V inter-peak

Neurofibromatosis Type II

Increased I-III, increased I-V inter-peak | Could have multiple Acoustic Neuromas

Vestibular Schwannoma: Translabyrinthine Approach

Vestibular and Auditory Function on side of Tumor is sacrificed; facial nerve is readily identified

Vestibular Schwannoma: Middle Fossa Approach

Hearing Preservation is possible

Vestibular Schwannoma: Sub occipital/ Retrosigmoid Approach

Hearing Preservation is possible Cerebellar retraction is necessary Greater risk of Facial Nerve injury INCREASED WAVE V LATENCY

Lesion: cochlear Nucleus

Increased III-V, Increased I-V

Pontine Glioma or Lesion at the Rostral Pons

Increased III-V, Increased I-V