Abstract
Multisystemic atherosclerosis simultaneously affecting the carotid and lower extremity peripheral arterial beds represents an aggressive phenotype of macrovascular disease. While macroscopic arterial narrowing is routinely evaluated using anatomical
imaging, systemic endothelial dysfunction often leads to microvascular failure long before structural occlusion completes. Cerebral autoregulation (CA) and cerebrovascular reactivity (CVR) are vital physiological mechanisms maintaining steady cerebral blood flow despite systemic blood pressure fluctuations.
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