Abstract
The Valsalva maneuver (VM) with beat-to-beat blood pressure and heart rate monitoring are used to evaluate orthostatic intolerance (OI). However, they lack the ability to detect cerebral hemodynamic changes, which may be a cause of OI symptoms. Therefore, we utilized near-infrared spectroscopy during VM. Patients with OI symptoms and normal healthy subjects were recruited. Patients were subgrouped according to VM results: patients with normal VM (NVM) and abnormal VM (AbVM). Oxyhemoglobin (HbO), deoxyhemoglobin, and total hemoglobin changes were measured at four different source-detector distances (SD) (15, 30, 36, and 45 mm), and latency, amplitude, duration, and integrated total signal were calculated. Those parameters were compared between a normal healthy control (HC) group and the two OI patient subgroups. We found that HbO increment latency at 30-mm SD in the HC, NVM, and AbVM groups was as follows: 0.39±0.23s, 2.79±0.36s, and 8.14±0.55s, respectively (p<0.05). Among the four parameters we evaluated, latency of HbO increment was the best marker for differentiating OI.
Original language | English |
---|---|
Article number | 015002 |
Journal | Neurophotonics |
Volume | 5 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2018 Jan 1 |
Bibliographical note
Funding Information:This research was supported by the Original Technology Research Program for Brain Science through the National Research Foundation (NRF) of Korea funded by the Ministry of Science ICT and Future Planning (MSIP) (No. 2017M3C7A1048566) and the NRF of Korea Grant funded by the Korean Government (MSIP) (No. NRF-2015R1A5A7037674). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the paper.
Publisher Copyright:
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE).
Keywords
- Valsalva maneuver
- near-infrared
- orthostatic intolerance
- spectroscopy
ASJC Scopus subject areas
- Neuroscience (miscellaneous)
- Radiological and Ultrasound Technology
- Radiology Nuclear Medicine and imaging