Adopting MR-guided stereotactic laser ablations for epileptic lesions: initial clinical experience and lessons learned.

OBJECTIVE: MR-guided laser interstitial thermal therapy (MRgLITT) is a minimally invasive technique for ablating brain lesions under real-time MRI feedback and control of the ablation process. The Medtronic Visualase system was recently approved for use in Europe and Israel. We report our initial technical experience using the system in the first 16 cases in which the system was used to ablate focal epileptogenic lesions. METHODS: We included all consecutive patients with intractable epilepsy who underwent MRgLITT procedures between 2018 and 2020. We reviewed medical charts and imaging studies of patients. Post-ablation MRIs were used to calculate ablation volumes. RESULTS: Seventeen MRgLITT procedures were performed in 16 patients. One cooling catheter/laser fiber assemblies were placed per patient. Indications for surgery were intractable epilepsy due to TLE (n = 7), suspected low-grade glioma (n = 4), radiological cortical dysplasia (n = 1), hypothalamic hamartoma (n = 1), and MR-negative foci (n = 3). Ablations were made using 30 to 70% of the maximal energy of the Visualase system. We used serial ablations as needed along the tract of the catheter by pulling back the optic fiber; the length of the lesion ranged between 7.4 and 38.1 mm. Ablation volume ranged between 0.27 and 6.78 mm3. Immediate post-ablation MRI demonstrated good ablation of the epileptic lesion in 16/17 cases. In one case with mesial temporal sclerosis, no ablation was performed due to suboptimal position of the catheter. That patient was successfully reoperated at a later date. Mean follow-up was 14.9 months (± 11.6 months). Eleven patients had follow-up longer than 12 months. Good seizure control (Engel I, A) was achieved in 7/11 patients (63%) and 1/11 (9%) had significant improvement in seizure frequency (Angle IIIa). Three patients (27%) did not experience improvement in their seizure frequency (Engel IV, B), and one of these patients died during the follow-up period from sudden unexpected death of epilepsy (SUDEP). No immediate or delayed neurological complications were documented in any of the cases during the follow-up period. CONCLUSIONS: MRgLITT is a promising technique and can be used safely as an alternative to open resection in both lesional and non-lesional intractable epilepsy cases. In our local series, the success rate of epilepsy surgery was comparable to recent publications.

Factors associated with parental grief reaction following pediatric acquired brain injury.

The present study investigated factors associated with parental grief reaction (PGR) following pediatric acquired brain injury (ABI), and compared PGR to the one exhibited following child death. Fifty-seven parents of 51 children (aged 3-18) whose ABI occurred 1-14 years before participation, completed the multi-scale Two-Track Bereavement Questionnaire; a socio-demographic questionnaire; and a scale assessing perceived behavioural changes in the child. Results from regression analysis indicated that time since injury had no impact on parents' grief other than having an adverse impact on their overall coping and functioning; A higher amount of weekly caring hours predicted only a greater traumatic perception of the loss; Older children's ages but mostly greater parental-perceived behavioural changes, predicted greater PGR on most scales. PGR was compared with the pre-existing data of bereaved parents who completed the same grief questionnaire. Although grief response patterns and intensity were similar in both groups, significant differences were found on scales assessing the continuing bond with the child: relational active grief, close and positive relationship, and conflictual relationship. Our findings indicate that parental grief is multi-dimensional following pediatric ABI and illuminate the interplay between elements characterizing parents' nonfinite vs. finite loss experience.