TY  - CHAP
M1  - Book, Section
TI  - Interpreting Grid and Strip Electrode EEG
A1  - Cascino, Gregory D.
A1  - Zimmerman, Richard S.
A2  - Sirven, Joseph I.
A2  - Stern, John M.
PY  - 2011
T2  - Atlas of Video-EEG Monitoring
AB  - Long-term  video-electroencephalographic  (EEG)  monitoring  may  be  used  to  confirm  the  diagnosis  of  a  seizure  disorder,  classify  seizure-type(s),  assess  response  to  therapy,  and  evaluate  patients  for  surgical  treatment  of  epilepsy.1–7  In  adult  patients,  video-EEG  monitoring  (VEM)  is  mainly  used  for  diagnostic  classification  (i.e.,  epilepsy  vs  nonepileptic  spells)  and  to  evaluate  surgical  candidacy  in  patients  with  medically  refractory  partial  seizure  disorders.  The  latter  indication  is  usually  restricted  to  patients  with  intractable  partial  epilepsy  being  considered  for  a  focal  cortical  resection.1  VEM  is  essential  in  determining  the  localization  of  the  epileptogenic  zone  (i.e.,  the  site  of  seizure  onset  and  initial  seizure  propagation)  in  adult  patients  being  considered  for  surgical  ablative  procedures.6  The  high  diagnostic  yield  of  VEM  in  adult  patients  with  recurrent  and  unprovoked  spells  has  been  confirmed.3  Recognition  of  the  ictal  EEG  pattern  may  be  pivotal  in  making  the  diagnosis  of  epilepsy  in  such  patients.  The  scalp-recorded  interictal  EEG  study,  neurologic  history  and  examination,  and  current  neuroimaging  procedures  may  not  always  permit  appropriate  spell  classification.  The  potential  disadvantages  of  video-EEG  recordings  include  the  inherent  cost  of  the  electrophysiological  study  and  hospitalization  and  the  need  for  special  resources  and  personnel.3  The  ictal  EEG  patterns  may  also  be  difficult  to  interpret  because  of  myogenic  and  movement  artifacts  (e.g.,  eye  blinking).  The  presence  of  a  subtle  epileptiform  discharge  may  be  difficult  to  distinguish  from  the  background.  In  certain  seizure  types,  for  example,  auras  and  simple  partial  seizures,  there  may  not  be  a  definite  scalp-recorded  EEG  alteration.1–6,8–11  Finally,  patients  may  not  have  a  typical  clinical  spell  during  VEM.  The  prolonged  interictal  EEG  study  may  not  prove  to  be  a  reliable  indicator  of  spell  classification.12  
SN  - 
PB  - McGraw-Hill Education
CY  - New York, NY
Y2  - 2024/04/19
UR  - neurology.mhmedical.com/content.aspx?aid=1103050862
ER  -