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. 2015 Jan 21;3(2):85–100. doi: 10.1159/000371453

Table 4.

IOM events and clinical outcome

Patient No. Pathology IOM events Outcome
48 h after endovascular procedure modified Rankin Scale score after 3 months
1

  • Spinal cord

  • AVM (C1–C2)

 None No neurological deficits mRS 0
2

  • Vertebral

  • hemangioma (T5)

 None No neurological deficits mRS 3 (epidural thoracic hematoma 1 month after the procedure)
3 Spinal cord AVM (C6–C7)

  • None

  • ↓ 90% MEP amplitude, left APB and biceps, right APB and bilateral TA

  • No changes in bilateral median and tibial SEPs

  • No neurological deficits

  • No neurological deficits

  • mRS 0

  • mRS 0
4 MCA aneurysm (right) None No neurological deficits mRS 0
5 ICA aneurysm (right) None No new neurological deficits mRS 1
6 MCA aneurysm (right) None No neurological deficits mRS 0
7 Basilar artery (trunk) aneurysm None No neurological deficits mRS 0
8 Fronto-opercular AVM (left)

  • ↓ >90% MEP amplitude, right extensor digitorum communi

  • ↓ 50% SEP amplitude, right median nerve

  • Fronto-temporal hematoma

  • Motor aphasia and moderate right hemiparesia and hemihypoesthesia

  • mRS 2

  • Slight disability; unable to carry out all activities as previously, but able to look after own affairs without assistance
9 Frontal AVM (right)

  • ↓ 80% MEP amplitude, left AH

  • for 10 min

  • None

  • None

  • No neurological deficits

  • No neurological deficits Repeated focal motor seizures with Todd's paresis: left lower limb plegia after 23 h of orotracheal intubation (recovered after 48 h)

 mRS 0
10 Occipital AVM (left) None No new neurological deficits mRS 1 (blurred vision after resective surgery)
11 Cerebellar (vermian) AVM None No new neurological deficits (previous cerebellar ataxia) mRS 1
12 Frontal AVM (left) None No new neurological deficits (previous mild aphasia) mRS 1

mRS = Modified Rankin Scale score.