Multi-parameters of Magnetic Resonance Imaging to Estimate Ischemia-Reperfusion Injury after Stroke in Hyperglycemic...

Area of Science:

• Neurology
• Radiology
• Biochemistry

Background:

• Ischemia-reperfusion injury is a major complication of ischemic stroke.
• Hyperglycemia is a common comorbidity in stroke patients and may influence outcomes.
• Noninvasive monitoring of injury progression is crucial for effective treatment.

Purpose of the Study:

• To investigate the impact of hyperglycemia on ischemia-reperfusion injury in a rat stroke model.
• To assess the feasibility of using Magnetic Resonance Imaging (MRI) techniques for noninvasive observation of this injury.

Main Methods:

• Forty rats were divided into four groups based on ischemia duration and glucose levels: hyperglycemic ischemic (H-I2h, H-I6h) and non-hyperglycemic ischemic (NH-I2h, NH-I6h).
• MRI sequences including T2W, DW, T2 mapping, T2* mapping, DCE, and T1 mapping were performed before and after reperfusion.
• Analysis of apparent diffusion coefficient (ADC), T1, T2, T2*, and Ktrans values in ischemic lesions.

Main Results:

• ADC values showed no significant differences between diabetic and non-diabetic groups or between 2-hr and 6-hr ischemia groups post-reperfusion.
• T2, T2*, and Ktrans values increased in all groups after reperfusion, with more pronounced changes in hyperglycemic groups (H-I6h vs. H-I2h).
• T1 values decreased across all groups; changes were more evident in hyperglycemic conditions.

Conclusions:

• Hyperglycemia exacerbates ischemia-reperfusion injury in ischemic stroke.
• Hyperglycemia is a significant risk factor influencing the prognosis of ischemic stroke.
• Ktrans values derived from MRI show promise as noninvasive indicators for monitoring blood-brain barrier permeability and ischemia-reperfusion injury.