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. 2017 Jul 12;12(7):e0180684. doi: 10.1371/journal.pone.0180684

Fig 4. Preoperative cerebrovascular reactivity (CVR) and postoperative asymmetry index (AI) the day after stent placement.

Fig 4

A CVR value lower than the mean + 2 SD (i.e., 23.8%) was defined as reduced CVR (vertical line), and an AI value higher than the mean + 3 SD (i.e., 104.6%) was defined as increase in AI (horizontal line). Open circles indicate patients with HPS after CAS.