Prolonged Peripheral Hypoperfusion Promotes Neuroprotection in Ischemic Stroke

Area of Science:

• Neurology
• Cardiovascular Medicine
• Vascular Biology

Background:

• Remote ischemic preconditioning (RIPC) induces neuroprotection against brain infarction.
• Chronic hypoperfusion in peripheral vascular disease (PVD) may mimic RIPC's effects.
• The correlation between hypoperfusion severity and neuroprotection extent requires investigation.

Purpose of the Study:

• To investigate the correlation between PVD severity and neuroprotection in acute ischemic stroke.
• To compare stroke volumes and clinical outcomes (mRS, NIHSS) in patients with and without PVD.
• To subgroup PVD cases by ankle-brachial index (ABI) to assess neuroprotection extent.

Main Methods:

• Retrospective analysis of ischemic stroke cases with and without PVD.
• Manual chart review for demographics, comorbidities, clinical measures, and stroke volumes.
• Subgrouping PVD cases by ABI values (mild, moderate, severe) and comparison with controls.

Main Results:

• PVD cases (n=50) had significantly lower stroke volumes (4.39 ml) compared to controls (19.33 ml).
• A significant difference in stroke volumes was observed between mild (3.86 ml) and severe (0.63 ml) PVD.
• Moderate to severe PVD cases showed a higher incidence of good outcomes (100%) versus controls (83.3%).

Conclusions:

• Increasing hypoperfusion due to PVD correlates with neuroprotection in acute ischemic stroke.
• Lower stroke volumes and improved clinical outcomes suggest a protective effect analogous to RIPC.
• PVD severity, assessed by ABI, is linked to the degree of neuroprotection observed in stroke patients.