Preliminary Study Using Wearable Near-Infrared Spectroscopy for Continuous Monitoring of Hemodynamics Through the
Nisha Maheshwari1,2, Alessandro Marone1, Lokesh Sharma1,2
1Department of Biomedical Engineering, 6 MetroTech Center, New York University Tandon School of Engineering, Brooklyn, NY 11201, USA.
Near-infrared spectroscopy (NIRS) offers a non-invasive method for monitoring carotid artery hemodynamics. This wearable system demonstrated equivalent measurements of total hemoglobin and oxygen saturation in carotid and radial arteries, supporting its use for tracking cerebral blood perfusion.
Area of Science:
- Biomedical Engineering
- Physiological Monitoring
- Medical Devices
Background:
- Non-invasive, continuous monitoring of carotid artery hemodynamics is crucial for assessing cerebral blood perfusion (CBP).
- Near-infrared spectroscopy (NIRS) presents a promising non-invasive technology for real-time hemodynamic monitoring.
- Existing methods for monitoring carotid hemodynamics may be invasive or lack continuous data.
Purpose of the Study:
- To evaluate a wearable Near-infrared spectroscopy (NIRS) system for non-invasive, continuous monitoring of carotid artery hemodynamics.
- To assess the feasibility of using NIRS to track changes in total hemoglobin concentration (HbT) and tissue oxygen saturation (StO2) in carotid arteries.
- To compare NIRS-derived hemodynamic parameters between carotid and radial arteries in healthy subjects.
Main Methods:
- A wearable NIRS system was developed and tested on 20 healthy subjects.
- Continuous monitoring of HbT and StO2 was performed on left and right radial and carotid arteries.
- Wilcoxon non-parametric equivalence testing was employed to compare radial and carotid artery measurements.
- Physiological challenges, such as sustained deep breathing, were used to induce changes in oxygen supply.
Main Results:
- The NIRS system successfully monitored HbT and StO2 trends in both radial and carotid arteries, aligning with expected physiological responses.
- Mean peak-to-peak amplitude of HbT was practically equivalent between left radial and left carotid arteries (p = 0.01).
- Mean peak-to-peak amplitude of StO2 was practically equivalent between left radial and left carotid arteries (p < 0.001) and right radial and right carotid arteries (p = 0.001).
Conclusions:
- Wearable NIRS is a viable non-invasive technology for continuous monitoring of carotid artery hemodynamics.
- NIRS measurements of HbT and StO2 in the carotid artery are comparable to those in the radial artery.
- This technology holds potential for tracking changes in cerebral blood perfusion (CBP) non-invasively.
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