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Cerebral metabolism after transient ischemic attack. A 1H MR spectroscopy study
1Service of Neurology, University Hospital of Dijon, University of Burgundy, France.
Neurological Research
|September 24, 1999
Summary
Transient ischemic attacks (TIAs) can increase lactate production in the brain, even without visible infarction. This metabolic shift may indicate temporary hypoperfusion and potential long-term infarction risk.
Area of Science:
- Neurology
- Neuroimaging
- Metabolic studies
Background:
- Cerebral infarction and carotid artery disease cause known metabolic changes detectable by 1H Magnetic Resonance Spectroscopy (1H MRS), including decreased N-acetyl-aspartate (NAA) and increased lactate.
- Limited data exists on metabolic alterations following transient ischemic attacks (TIAs) in the absence of infarction or arterial stenosis.
Purpose of the Study:
- To investigate metabolic changes in the brain within three days of a TIA using 1H MRS.
- To compare metabolic profiles between symptomatic and contralateral healthy brain regions after TIA.
Main Methods:
- Studied five patients experiencing TIAs affecting brachio-facial functions.
- Utilized Computerized Tomography (CT), electro-encephalogram, cervical Doppler ultrasound, and MRI with 1H MRS.
- Compared metabolic ratios (NAA/Creatine, Lactate/Creatine) between affected and unaffected brain areas.
Main Results:
- No significant changes in the NAA/Creatine ratio were observed.
- A notable increase in the Lactate/Creatine ratio was found in the symptomatic, non-infarcted brain area compared to the normal contralateral area.
- No carotid artery stenosis or cerebral infarction was detected in the patients.
Conclusions:
- Transient ischemic attacks (TIAs) are associated with increased lactate production in the brain within three days, even without infarction.
- This lactate increase may signify transient local hypoperfusion, potentially indicating a long-term risk for infarction in the affected region.