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<br>Background: The cerebrovascular reactivity (CVR) outcomes of blood oxygen level-dependent (Bold) and arterial spin labeling (ASL) MRI research carried out in patients with cerebrovascular illness (steno-occlusive vascular disease or stroke) were systematically reviewed. Summary: Thirty-one articles have been included. Twenty-three (74.2%) research used Bold MRI to judge the CVR, 4 (12.9%) studies used ASL MRI and four (12.9%) research used each Bold and ASL MRI. Thirteen research (3 important) discovered a lower Bold CVR, 2 studies discovered the same CVR and 3 research found a better CVR within the ipsilateral in comparison with the contralateral hemisphere. Nine (5 important) out of 10 studies found a decrease Bold CVR in the ipsilateral hemispheres of patients compared to controls. Six research (2 vital) found a decrease ASL CVR in the ipsilateral in comparison with the contralateral hemispheres. Three out of 5 research found a big decrease ASL CVR in the ipsilateral hemispheres of patients compared to controls. Key messages: This evaluation brings help for a reduced Bold and ASL CVR within the ipsilateral hemisphere of patients with cerebrovascular illness. We suggest that future studies can be performed in a uniform way so reference values can be established and could be used to information treatment decisions in patients with cerebrovascular illness.<br>
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