Non-Invasive Hemodynamic Monitoring System Integrating Spectrometry, Photoplethysmography, and Arterial Pressure...

Area of Science:

• Biomedical Engineering
• Optical Physics
• Physiology

Background:

• Minimally invasive and non-invasive hemodynamic monitoring are gaining traction due to risks associated with invasive methods.
• Technological advancements are driving innovation in patient monitoring systems.

Purpose of the Study:

• To present an experimental non-invasive system integrating spectrometry, photoplethysmography (PPG), and arterial pressure measurement.
• To investigate wavelength-dependent optical signal analysis for hemodynamic monitoring.

Main Methods:

• Utilized time- and wavelength-resolved optical signals from the fingertip under gradually increasing external pressure.
• Measured optical signals across 434-731 nm, analyzing distinct wavelength bands.
• Correlated optical measurements with external pressure levels to differentiate superficial and deep vascular probing.

Main Results:

• Identified distinct optical channel responses based on wavelength, differentiating superficial (low-pressure) and deep (high-pressure) vessels.
• Observed significant differences in perfusion indices and DC component levels across optical channels.
• Highlighted the critical role of wavelength selection in optical hemodynamic monitoring.

Conclusions:

• The integrated non-invasive system demonstrates potential for extracting simultaneous hemodynamic information from macrocirculation to microcirculation.
• Wavelength selection is crucial for optimizing optical hemodynamic monitoring systems.
• This technology offers a promising non-invasive approach for comprehensive hemodynamic assessment.