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Outcomes and comorbidities of SCN1A-related seizure disorders
Iris M de Lange1, Boudewijn Gunning2, Anja C M Sonsma1
1Department of Genetics, University Medical Center Utrecht, Utrecht University, the Netherlands.
Insights
Dravet syndrome often involves severe walking and behavioral issues, impacting quality of life. Milder SCN1A-related epilepsy phenotypes have fewer comorbidities and a better prognosis, though some issues persist.
Area of Science:
- Neurology
- Genetics
- Epilepsy
Background:
- Differentiating Dravet syndrome from other SCN1A-related epilepsy phenotypes is crucial for accurate prognosis.
- Information on seizure course, medication, and comorbidities in milder SCN1A-related epilepsies like GEFS+ and FS is limited.
- Understanding comorbidities in SCN1A-related disorders is vital for comprehensive patient care.
Purpose of the Study:
- To investigate disease characteristics in milder SCN1A-related epilepsy phenotypes.
- To determine the nature, occurrence, and relationships of comorbidities in both Dravet and non-Dravet SCN1A-related syndromes.
- To provide valuable prognostic information for clinicians and newly diagnosed patients.
Main Methods:
- Cross-sectional study of 164 Dutch participants with SCN1A-related seizures.
- Cohort included 116 patients with Dravet syndrome and 48 with GEFS+, FS+, or FS.
- Data collected via medical records, interviews, and validated questionnaires (FMS, PedsQL, CBCL/ABCL).
Main Results:
- Severe comorbidities like walking disabilities (71%) and behavioral problems (43%) are prevalent in Dravet syndrome, correlating with lower quality of life (QoL).
- Non-Dravet phenotypes exhibit milder comorbidities, such as learning (27%) and behavioral problems (38%), with QoL comparable to the general population.
- Most non-Dravet patients (85%) achieve seizure freedom by age 10.
Conclusions:
- Severe behavioral and walking issues in Dravet syndrome require specific clinical attention.
- Non-Dravet syndromes have a more favorable epilepsy course, but milder comorbidities are still present.
- Findings offer critical insights for clinical management and patient/parental guidance on prognosis.
Purpose:
Differentiating between Dravet syndrome and non-Dravet SCN1A-related phenotypes is important for prognosis regarding epilepsy severity, cognitive development, and comorbidities. When a child is diagnosed with genetic epilepsy with febrile seizures plus (GEFS+) or febrile seizures (FS), accurate prognostic information is essential as well, but detailed information on seizure course, seizure freedom, medication use, and comorbidities is lacking for this milder patient group. In this cross-sectional study, we explore disease characteristics in milder SCN1A-related phenotypes and the nature, occurrence, and relationships of SCN1A-related comorbidities in both patients with Dravet and non-Dravet syndromes.
Methods:
A cohort of 164 Dutch participants with SCN1A-related seizures was evaluated, consisting of 116 patients with Dravet syndrome and 48 patients with either GEFS+, febrile seizures plus (FS+), or FS. Clinical data were collected from medical records, semi-structured telephone interviews, and three questionnaires: the Functional Mobility Scale (FMS), the Pediatric Quality of Life Inventory (PedsQL) Measurement Model, and the Child or Adult Behavior Checklists (CBCL/ABCL).
Results:
Walking disabilities and severe behavioral problems affect 71% and 43% of patients with Dravet syndrome respectively and are almost never present in patients with non-Dravet syndromes. These comorbidities are strongly correlated to lower quality-of-life (QoL) scores. Less severe comorbidities occur in patients with non-Dravet syndromes: learning problems and psychological/behavioral problems are reported for 27% and 38% respectively. The average QoL score of the non-Dravet group was comparable with that of the general population. The majority of patients with non-Dravet syndromes becomes seizure-free after 10 years of age (85%).
Conclusions:
Severe behavioral problems and walking disabilities are common in patients with Dravet syndrome and should receive specific attention during clinical management. Although the epilepsy course of patients with non-Dravet syndromes is much more favorable, milder comorbidities frequently occur in this group as well. Our results may be of great value for clinical care and informing newly diagnosed patients and their parents about prognosis.
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