Fifty Years of Deciphering Stroke Pathophysiology

Area of Science:

• Neurology
• Radiology
• Medical Imaging

Background:

• Ischemic stroke pathophysiology research has significantly advanced over the past 50 years.
• Positron emission tomography (PET) has been pivotal in understanding stroke mechanisms and developing therapies.

Purpose of the Study:

• To highlight the contributions of PET imaging to stroke research and therapeutic advances.
• To detail key milestones in understanding ischemic stroke pathophysiology based on decades of PET research.

Main Methods:

• Utilized positron emission tomography (PET) in both animal models and human stroke patients.
• Conducted research spanning four decades to study stroke pathophysiology.

Main Results:

• Demonstrated hemodynamic consequences of carotid artery occlusion and transient ischemic attacks.
• Validated the ischemic penumbra and core/penumbra model in humans.
• Showed persistent penumbral volumes up to 17 hours post-stroke.
• Identified patient subgroups with large core infarcts or spontaneous reperfusion, emphasizing personalized treatment.
• Documented selective neuronal loss in the salvaged penumbra, a potential neuroprotection target.
• Revealed remote metabolic effects like diaschisis, suggesting targets for adaptive plasticity therapies.

Conclusions:

• PET imaging has been crucial for major breakthroughs in ischemic stroke pathophysiology and therapy.
• Individualized patient selection for stroke trials and treatments should be based on physiological imaging rather than time alone.
• Further research into neuroprotection and adaptive plasticity, informed by PET findings, holds therapeutic promise.