PAPER 2026 SOLVED QUESTION SET
◉ Primary goal of intraoperative neuromonitoring Answer: Detect
neural injury early enough to allow intervention and prevent deficit.
◉ Main modalities in CNIM Answer: SSEP, MEP, EMG, EEG, BAEP.
◉ ACNS alarm criteria for SSEPs Answer: ≥50% amplitude drop and/or
≥10% latency increase.
◉ ACNS UE SSEP bandpass Answer: ≈30-1,000 Hz.
◉ ACNS LE SSEP bandpass Answer: ≈30-1,000 Hz.
◉ ACNS BAEP bandpass Answer: ≈100-150 Hz to 2,500-3,000 Hz.
◉ Which tract do SSEPs assess? Answer: Dorsal column-medial
lemniscal.
◉ Which tract do MEPs assess? Answer: Corticospinal tract.
, ◉ Anterior spinal artery supplies Answer: Anterior two-thirds of cord,
including motor tracts.
◉ Median nerve obligate peaks Answer: N9, N13, P14, N20.
◉ LE SSEP cortical peak name Answer: P37.
◉ SSEP stimulation rate typical Answer: 2-5 Hz.
◉ Why avoid NMBAs in MEP cases? Answer: They suppress muscle
responses.
◉ Typical MEP train parameters Answer: 3-9 pulses, 200-500 μs, 1-4 ms
ISI.
◉ Most sensitive to anterior cord ischemia Answer: MEPs.
◉ Free-run EMG purpose Answer: Detect spontaneous discharges from
nerve irritation.
◉ Triggered EMG breach concern threshold Answer: <8 mA.