A1 Refereed original research article in a scientific journal
Non-Invasive Hemodynamic Monitoring System Integrating Spectrometry, Photoplethysmography, and Arterial Pressure Measurement Capabilities
Authors: Sirkiä, Jukka-Pekka; Panula, Tuukka; Kaisti, Matti
Publisher: Wiley-VCH
Publication year: 2024
Journal: Advanced Science
Journal name in source: Advanced science (Weinheim, Baden-Wurttemberg, Germany)
Journal acronym: Adv Sci (Weinh)
Article number: 2310022
Volume: 11
Issue: 24
ISSN: 2198-3844
eISSN: 2198-3844
DOI: https://doi.org/10.1002/advs.202310022
Web address : https://onlinelibrary.wiley.com/doi/10.1002/advs.202310022
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/393298690
Minimally invasive and non-invasive hemodynamic monitoring technologies have recently gained more attention, driven by technological advances and the inherent risk of complications in invasive techniques. In this article, an experimental non-invasive system is presented that effectively combines the capabilities of spectrometry, photoplethysmography (PPG), and arterial pressure measurement. Both time- and wavelength-resolved optical signals from the fingertip are measured under external pressure, which gradually increased above the level of systolic blood pressure. The optical channels measured at 434-731 nm divided into three groups separated by a group of channels with wavelengths approximately between 590 and 630 nm. This group of channels, labeled transition band, is characterized by abrupt changes resulting from a decrease in the absorption coefficient of whole blood. External pressure levels of maximum pulsation showed that shorter wavelengths (<590 nm) probe superficial low-pressure blood vessels, whereas longer wavelengths (>630 nm) probe high-pressure arteries. The results on perfusion indices and DC component level changes showed clear differences between the optical channels, further highlighting the importance of wavelength selection in optical hemodynamic monitoring systems. Altogether, the results demonstrated that the integrated system presented has the potential to extract new hemodynamic information simultaneously from macrocirculation to microcirculation.
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Funding information in the publication:
The works of J.-P.S. and T.P. were supported by the University of Turku Graduate School. This project has received funding from the European Union's Horizon Europe research and innovation programme under grant agreement no. 101115492.
