Persistent high lactate level as a sensitive MR spectroscopy indicator of completed infarction

Area of Science:

• Neuroscience
• Medical Imaging
• Biochemistry

Background:

• Cerebral infarction diagnosis relies on imaging and clinical evaluation.
• Magnetic resonance (MR) spectroscopy offers metabolic insights.
• Assessing MR spectroscopy's utility in stroke models is crucial for clinical translation.

Purpose of the Study:

• To evaluate the sensitivity of proton (1H) and phosphorus-31 (31P) MR spectroscopy for detecting cerebral infarction in a rat model.
• To determine if these techniques can reliably identify completed infarction.

Main Methods:

• Serial 1H and 31P MR spectroscopy were performed on rats with experimentally induced chronic cerebral infarction.
• Spectroscopic data were correlated with pathological findings.
• The sensitivity of each technique for detecting infarction was assessed over time.

Main Results:

• 31P MR spectroscopy returned to normal patterns within 24 hours, despite confirmed infarction, indicating low sensitivity.
• 1H MR spectroscopy consistently revealed elevated lactate levels in infarcted brain regions.
• 1H MR spectroscopy successfully differentiated completed infarction from recovered brain tissue.

Conclusions:

• Persistent high lactate levels detected by 1H MR spectroscopy are a reliable indicator of completed cerebral infarction.
• 31P MR spectroscopy is not sufficiently sensitive for diagnosing clinical cerebral infarction in this model.
• 1H MR spectroscopy holds promise for non-invasive assessment of stroke outcomes.