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. 2016 Feb 16;8:22. doi: 10.3389/fnagi.2016.00022

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Copyright © 2016 Novak.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Details of cerebral blood flow velocity (CBFv) in OCHOs (right) and in a control subject with normal response to tilt (left). OCHOs subject is 61-year-old man with history of orthostatic dizziness and neuropathy. During tilt, patient complained on dizziness with headache and he became very tired at the end of the tilt. Note progressive decline in CBFv during the tilt pointed by black arrows. Both resistance index (RI) and cerebrovascular resistance (CVR) increased in OCHOs while they remained unchanged in control subject during the tilt. The mean blood pressure was stable in both control and OCHOs subject during tilt. The heart responses to tilt were preserved in both subjects.