Evoked Potentials Flashcards
BAER: Abnormal I-III latency
Acoustic neuroma
BAER: Abnormal III-V
MS or adrenoleukodystrophy
Cause of bilateral P100 prolonged latency
Cannot localize, ON, tumor, retina, radiations or degenerative brain disease
Absence of waves I-V in BAER
No interpretation could be technical,
Wave I present but II-V absent
Brain death
Delayed N21 normal N21-P37
Conduction defect proximal to /peripheral to cauda equina
Abnormal N21-P37
Conduction defect above cauda equina but below sensory cortex
Absence of wave V
Defect rostral to pons
Abnormal N13-N20
Above medulla below thalamus
Delayed N21 and N21-P37
Peripheral to cauda equina and below sensory cortex
Delayed P37 absolute latency and abnormal N21-P37 latency
Conduction defect above cauda equina but below sensory cortex
During left tibial SSEP scalp recording electrodes are:
Cz and C3
Transcranial motor stimulation active electrode is
Anode
D wave in transcranial motor stimulate
From direct stimulation of dorsal corticospinal tracks
What can cause prolongation of peripheral cervical and central SSEP
Hypothermia