Related Experiment Videos
Long-term neurological implications of somnolence syndrome in children with acute lymphocytic leukemia
Insights
Central nervous system (CNS) prophylaxis for acute lymphocytic leukemia (ALL) in children can lead to long-term brain dysfunction. Somnolence syndrome after treatment may indicate future neurological issues like learning disabilities or seizures.
Area of Science:
- Pediatric Oncology
- Neuroscience
- Radiology
Background:
- Acute lymphocytic leukemia (ALL) treatment often involves central nervous system (CNS) prophylaxis.
- Long-term neurological effects of CNS prophylaxis require further investigation.
Purpose of the Study:
- To assess the long-term impact of CNS prophylaxis on brain function in children with ALL.
- To identify potential early indicators of neurological sequelae.
Main Methods:
- A longitudinal study involving 49 children with ALL in first complete remission.
- Electroencephalograms (EEGs) were performed before, during, and after 30 months of treatment.
- Treatment included cranial irradiation and intrathecal methotrexate therapy.
Main Results:
- All 49 children exhibited abnormal EEG background frequencies throughout the four-year study.
- 29 children (60%) developed somnolence syndrome, characterized by significantly decreased EEG background frequencies.
- Of those with somnolence syndrome, 7 developed learning disabilities and 7 experienced recurrent seizures.
- Children without somnolence syndrome showed no subsequent CNS dysfunction.
Conclusions:
- Somnolence syndrome following CNS prophylaxis may serve as an early predictor of long-term neurological deficits.
- Cranial irradiation and intrathecal methotrexate therapy can have lasting effects on brain function in pediatric ALL survivors.
Abstract:
A longitudinal study of 49 children with acute lymphocytic leukemia (ALL) assessed the long-term effects of central nervous system (CNS) prophylaxis on brain function. From 10 to 12 electroencephalograms (EEGs) were done before and at intervals during after 30 months of treatment that included 2,400 rads of CNS irradiation plus intrathecal methotrexate therapy. None of the children had CNS leukemia, and all remained in first complete remissions. All 49 had abnormally slow EEG background frequencies during the four-year study, and 29 (60%) developed somnolence syndrome six to eight weeks after CNS prophylaxis. During this syndrome, EEG background frequencies decreased more than 3 standard deviations below the expected mean values for normal children. Thereafter, 7 of the 29 began to show signs of learning disabilities and 7 developed recurrent seizures. Of the 20 children who did not have the syndrome, none showed later evidence of CNS dysfunction. Somnolence may be an early indicator of long-term neurological sequelae after cranial irradiation.