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Regional cerebral perfusion in PLEDs: a case report
1Department of Neurology, Indiana University Medical Center, Indianapolis.
Epilepsia
|September 1, 1988
Summary
Periodic lateralized epileptiform discharges (PLEDs) on EEG correlate with increased brain activity, suggesting PLEDs indicate heightened neuronal function. This finding may explain associated neurological symptoms and seizures.
Area of Science:
- Neuroscience
- Nuclear Medicine
- Epileptology
Background:
- Periodic lateralized epileptiform discharges (PLEDs) are EEG patterns often seen in patients with acute brain injury.
- The underlying pathophysiology of PLEDs and their relationship to neuronal activity remain incompletely understood.
- Functional brain imaging can provide insights into regional cerebral blood flow and neuronal metabolism.
Observation:
- Single-photon emission computed tomography (SPECT) brain imaging was performed using [123I]N,N,N'-trimethyl-N'-(2 hydroxy-3-methyl-5-123I-iodobenzyl)-1,3-propane-diamine dihydrochloride (HIPDM) in one patient exhibiting PLEDs on electroencephalography (EEG).
- The HIPDM-SPECT imaging revealed increased regional cerebral perfusion specifically within the area identified as the PLEDs focus.
- This localized hyperperfusion suggests a direct correlation between the EEG abnormality and metabolic activity in the brain.
Findings:
- The study demonstrated that PLEDs are associated with abnormally enhanced neuronal activities, as evidenced by increased regional cerebral perfusion in the PLEDs focus.
- This finding supports the hypothesis that PLEDs are not merely epiphenomena but reflect active, heightened neural function.
- The observed hyperperfusion in the PLEDs region provides a potential neurobiological explanation for associated clinical manifestations.
Implications:
- The results suggest that PLEDs may serve as a marker for localized neuronal hyperexcitability.
- Understanding the link between PLEDs and enhanced neuronal activity could improve the diagnosis and management of neurological conditions.
- This neuroimaging evidence may help explain the frequent co-occurrence of mental confusion, focal neurological signs, and seizures in patients with PLEDs.