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Focal signs in infantile spasms
Carmen Haneder1, Birgit Stark1, Anna Peherstorfer1
1Department of Paediatrics and Adolescent Medicine, Kepler University Hospital, Linz, Austria.
Seizure
|February 19, 2022
Summary
Focal features in infantile spasms (IS) can occur without brain lesions, unlike in older individuals. This suggests immature brain development may influence symptom presentation in infants with IS.
Area of Science:
- Neurology
- Pediatric Neurology
- Epileptology
Background:
- Infantile spasms (IS) are a form of epileptic encephalopathy common in infancy, often linked to severe developmental delays.
- The role of focal features in IS, whether independent of cause or indicative of brain lesions, remains unclear.
- Understanding focal features is crucial for diagnosing and managing IS.
Purpose of the Study:
- To investigate the relationship between focal neurological signs and the presence of cerebral lesions in infants with IS.
- To determine if lateralizing symptoms in IS are associated with underlying brain pathology.
- To compare focal sign presentation in IS with that in older children and adults.
Main Methods:
- Analysis of prolonged video-electroencephalogram (EEG) monitoring data from patients with IS.
- Classification of observed symptoms (tonic posturing, clonic movements, eye/mouth deviation) as lateralizing or non-lateralizing.
- Correlation of focal signs with the presence or absence of cerebral lesions.
Main Results:
- Focal signs were observed in 94.4% of the 18 infants studied.
- Lateralizing tonic posturing occurred in 66.6% of patients.
- Half of the patients with focal signs did not have an identifiable cerebral lesion.
Conclusions:
- Lateralizing symptoms in infantile spasms can manifest independently of cerebral lesions.
- This contrasts with older patients where focal signs typically indicate a lesion.
- Brain maturation in infancy may explain the dissociation between focal signs and lesions in IS.
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