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BAEP Questions and Correct Answers

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BAEP Questions and Correct Answers

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BAEP Questions and Correct Answers
BAEP Ans: brainstem auditory evoked potential far field
generated by the auditory pathway and is stimulated by sound
typically monitored during surgery within the posterior fossa

BAEP latencies Ans: wave I - 1.7

wave III - 3.9

wave V - 5.7

most important waves I and V

wave 1 generator Ans: distal VIII nerve (as it leave cochlea)

wave 2 generator Ans: proximal VIII nerve (as it enters brianstem)

wave 3 generator Ans: medulla in brainstem (cochlear
nucleus)(superior olivary complex)

wave 4 generator Ans: brainstem

wave 5 generator Ans: midbrain (lateral lemniscus)(inferior
colliculus)

changes in wave 1 Ans: consistent with auditory nerve
dysfunction


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delay in wave 1-3 Ans: consistent with auditory nerve dysfunction

changes in wave 3-5 Ans: consistent with brainstem dysfunction

BAEP stimulus Ans: broad band clicks

recommended BAEP stim intensity Ans: 60-70 dB HL

100 dB SPL

BAEP stimulus delivery Ans: delivered one ear at a time. ipsilateral
ear to surgery monitored continuously. contralateral ear
stimulated at intervals to check for developing asymmetry, latency
and amplitude differences

BAEP alternating polarity Ans: reduces stimulus artifact

BAEP masking Ans: recommended contralateral ear (non-
stimulated ear) be masked with white noise at 60 dB pe SPL to
prevent "crossover" responses.

BAEP electrode placement Ans: 1. (A1/A2) or left and right
mastoid process (M1/M2)

2. scalp at vertex (Cz)

3. Ground at Fz




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