Related Experiment Video
Updated: Sep 28, 2026
Simultaneous PET/MRI Imaging During Mouse Cerebral Hypoxia-ischemia
Published on: September 20, 2015
Cerebral regional hypometabolism caused by propofol-induced sedation in children with severe myoclonic epilepsy: a
Freimut D Juengling1, Jan Kassubek, Heike Martens-Le Bouar
1Department of Radiology, Division of Nuclear Medicine, University Hospital Freiburg, Hugstetterstr. 55, D-79106, Freiburg, Germany. freimut.juengling@insel.ch
Insights
Sedation for pediatric cerebral positron emission tomography (PET) can affect glucose metabolism. Propofol sedation in children with epilepsy revealed bilateral parieto-occipital hypometabolism, a likely sedation-specific effect to consider in FDG-PET scan interpretation.
Area of Science:
- Neuroimaging
- Pediatric Neurology
- Radiochemistry
Background:
- Cerebral positron emission tomography (PET) is a valuable tool for assessing brain function in children.
- Sedation is frequently required for pediatric PET scans, potentially influencing metabolic measurements.
- Severe myoclonic epilepsy in children necessitates accurate neuroimaging for diagnosis and management.
Purpose of the Study:
- To evaluate the impact of sedation on cerebral glucose metabolism measured by (18)F-fluorodeoxyglucose (FDG)-PET in children.
- To identify specific brain regions affected by sedation-induced metabolic changes.
- To inform the interpretation of FDG-PET scans in sedated pediatric populations.
Main Methods:
- Utilized cerebral (18)F-fluorodeoxyglucose (FDG)-PET in 30 children with severe myoclonic epilepsy.
- Administered propofol sedation to 24 children prior to PET acquisition.
- Employed statistical parametric mapping (SPM99) for pixel-based statistical comparisons against healthy adult and age-matched child controls.
Main Results:
- Identified significant bilateral parieto-occipital hypometabolism in all sedated children.
- Affected regions included the lingual gyrus, cuneus, posterior cingulate, and middle occipital gyrus.
- Propofol dose correlated with the extent of hypometabolism (P<0.01, corrected).
Conclusions:
- Bilateral parieto-occipital hypometabolism is a likely sedation-specific effect in pediatric FDG-PET.
- These findings necessitate careful consideration when interpreting cerebral glucose metabolism in sedated children.
- Adjusting for sedation effects is crucial for accurate neuroimaging analysis in pediatric epilepsy.
Abstract:
Cerebral positron emission tomography (PET) in children often requires sedation. This study evaluated sedation-associated effects on cerebral glucose metabolism in 30 children with severe myoclonic epilepsy as investigated by cerebral (18)F-fluorodeoxyglucose (FDG)-PET. Prior to the PET acquisition, 24 children underwent propofol sedation. Pixel-based t-statistics were calculated using statistical parametric mapping (SPM99) for comparisons of the patients' PET scans with both a healthy adult control group and an age-matched child intra-group control. In both analyses, statistically significant hypometabolic areas were found in the medial parieto-occipital cortex bilaterally, including the lingual gyrus, cuneus, posterior cingulate and middle occipital gyrus in all sedated children. All these localizations correlated in a covariate analysis with the injected dose of propofol (P<0.01, corrected). The bilateral parieto-occipital hypometabolism is likely to be a sedation-specific effect and should be taken into account when evaluating cerebral FDG-PET scans in sedated children.
