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Published on: June 9, 2023
Electrode Tip Shift During the Stereotactic Electroencephalography Evaluation Period with Boltless Suture Fixation
Vich Yindeedej1, Takehiro Uda2, Toshiyuki Kawashima2
1Department of Neurosurgery, Osaka Metropolitan University, Graduate School of Medicine, Osaka, Japan; Division of Neurosurgery, Department of Surgery, Thammasat University Hospital, Faculty of Medicine, Thammasat University, Pathumthani, Thailand.
Stereotactic electroencephalography (SEEG) electrodes fixed with sutures may shift. Greater scalp thickness differences significantly correlated with increased electrode tip shift, particularly with temporal lobe entry.
Area of Science:
- Neurosurgery
- Neurology
- Medical Devices
Background:
- Stereotactic electroencephalography (SEEG) electrodes are typically secured with anchor bolts.
- Alternative fixation methods, such as suture technique, may lead to electrode shift.
- This study investigates electrode tip shift in SEEG monitoring when using suture fixation.
Purpose of the Study:
- To evaluate electrode tip shift distance (TSD) in SEEG monitoring.
- To identify factors influencing electrode shift in suture-fixed SEEG electrodes.
- To provide insights for surgical considerations in SEEG implantation.
Main Methods:
- Retrospective analysis of patients undergoing SEEG implantation with suture fixation.
- Evaluation of tip shift distance (TSD) for 50 electrodes across 7 patients.
- Assessment of potential influences: implantation period, entry lobe, laterality, electrode length, skull thickness, and scalp thickness difference.
Main Results:
- Mean TSD was 1.4 ± 2.0 mm over an 8.1 ± 2.2-day implantation period.
- Multivariate analysis revealed that greater scalp thickness difference significantly correlated with increased TSD (P=0.0018).
- No significant correlation was found between TSD and implantation period or electrode length.
Conclusions:
- Greater scalp thickness difference is a significant predictor of increased electrode tip shift in SEEG.
- Surgeons should consider scalp thickness variations when using suture fixation for SEEG electrodes.
- Particular attention is warranted for temporal lobe entries due to potential for greater shift.
