BAEP Flashcards by Nicholas Rainer | Brainscape

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

Q

Otosclerosis

A

Increase in Absolute Latency, Normal inter-peak latencies

Q

Nitrous Oxide

A

Increase in Absolute Latency, Normal inter-peak latencies

Q

Most important preparation step for BAEP?

A

Water tight seal of tape over ear

Q

What modality is monitored during cholesteatoma surgery?

A

Facial Nerve only, CN VII

Q

What modality is monitored during cholesteatoma surgery?

A

Facial Nerve only, CN VII

Q

What Modality is monitored during Mastoidectomy surgery?

A

CN VII

Q

What Modality is monitored during tympanoplasty surgery?

A

CN VII

Q

What modality is monitored during Porus Acusticus Surgery?

A

CN VII and BAEP

Q

Tinnitus

A

Ringing in the ear

Q

Meneires Disease Surgery

A

Endolymphatic Sac Decompression

Q

What modality is monitored during Endolymphatic Sac Decompression Surgery?

A

CN VII and BAEP

Q

High Frequency Hearing Loss

A

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

Q

Broad Band Click range

A

2,000-4,000 Hz

Q

Type of Clicks used in BAEP?

A

Broad Band Clicks

Q

Presbycusis (definition)

A

High Frequency hearing loss in old age

Q

Presbycusis

A

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

Q

Ischemia of the Cochlea

A

Increase in Absolute Latency, Normal Inter-peak Latencies

Q

Hypothermia

A

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

Q

Acoustic Neuroma

A

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

Q

Vestibular Schwannoma

A

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

Q

Neurofibromatosis Type II

A

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

Could have multiple Acoustic Neuromas

Q

Vestibular Schwannoma: Translabyrinthine Approach

A

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

Q

Vestibular Schwannoma: Middle Fossa Approach

A

Hearing Preservation is possible

Q

Vestibular Schwannoma: Sub occipital/ Retrosigmoid Approach

A

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

Q

Lesion: cochlear Nucleus

A

Increased III-V, Increased I-V

Q

Pontine Glioma or Lesion at the Rostral Pons

A

Increased III-V, Increased I-V