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Identification of infants at risk for infantile spasms by neonatal polygraphy
B Walther1, T Schmitt, B Reitter
1Department of Pediatrics, University Hospital, Mainz, West Germany.
Insights
A new scoring system using neonatal electroencephalograms (EEGs) can accurately identify infants at risk for infantile spasms. This tool aids in early detection and potential intervention to prevent developmental issues.
Area of Science:
- Neonatal neurology
- Pediatric epilepsy
- Neurodevelopmental disorders
Background:
- Infantile spasms and hypsarrhythmia are severe neurological conditions in infants.
- Early identification is crucial for effective treatment and improved outcomes.
- Conventional EEG methods have limitations in predicting risk.
Purpose of the Study:
- To develop and validate a compound score for identifying infants at risk of infantile spasms using neonatal EEG.
- To assess the predictive accuracy of the new scoring system.
Main Methods:
- Reevaluation of 40 neonatal EEGs from infants with infantile spasms/hypsarrhythmia to create an 8-item risk score.
- Prospective evaluation of 941 newborn polygraphic tracings using the developed score.
- Analysis of score validity and comparison with conventional EEG.
Main Results:
- The compound score identified 25 high-risk infants (perinatal distress or brain malformations), all of whom developed infantile spasms/hypsarrhythmia.
- The scoring system achieved 100% positive predictive value and a 0.1% false-negative rate.
- Conventional EEG predicted only 5 out of 8 infantile spasms cases.
Conclusions:
- A validated risk-score based on polygraphic tracing (36-44 weeks conceptual age) effectively identifies infants at risk for infantile spasms.
- Early detection via this score may enable pre-onset treatment to prevent secondary mental deterioration.
Abstract:
Reevaluation of neonatal EEGs and polygraphic tracings of 40 infants with infantile spasms and/or hypsarrhythmia resulted in the constitution of a compound score for the identification of infants at risk for infantile spasms by neonatal EEG. The score comprises 8 distinct items: 2 concern behavioral characteristics, 6 abnormality of EEG background activity and paroxysmal events. A tracing registered at conceptional age 36 to 44 weeks (eventually up to 50 weeks) presenting at least 4 of these 8 items is scored positive for the risk of evolving hypsarrhythmia. In a prospective study the polygraphic tracings of 941 newborn infants were evaluated for risk: 18 infants suffering from perinatal distress and 7 newborns with malformations of the brain were scored positive and all 25 developed infantile spasms and/or hypsarrhythmia. One infant with later infantile spasms was missed by the scoring system. None of the remaining infants scored negative manifested infantile spasms. Thus, correct positive prognostication was 100% and false negative 0.1%. By conventional EEG 5 out of 8 patients with infantile spasms were correctly predicted. The high validity of the risk-score based on polygraphic tracing between conceptional age 36 to 44 weeks may allow pre-onset treatment preventing secondary mental deterioration due to hypsarrhythmia and infantile spasms.