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FIG 1. SSEP tracing demonstrates changes in recordings during the embolization. Upper extremity (UE) SSEP were obtained from stimulating the left (MS) and right (MD) median nerves at the wrists and by recording evoked potentials from the scalp. The arrow on the far right indicates the time at which the SSEP waveforms began to deviate. The arrowheads indicate the wave change with a 60% loss of amplitude in the P30 response in each hemisphere.
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