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Your search keyword '"Evelina Urtane"' showing total 3 results
Start Over "Evelina Urtane" Topic 0103 physical sciences
3 results on '"Evelina Urtane"'

1. Microvascular blood flow changes of the abductor pollicis brevis muscle during sustained static exercise

Author

Turgut Durduran, Udo M. Weigel, Zbignevs Marcinkevics, Martina Giovannella, Evelina Urtane, Uldis Rubins, Marta Zanoletti, and Umut Karadeniz

Subjects
medicine.medical_specialty, Contraction (grammar), Hemodynamics, Vasodilation, Thumb, 01 natural sciences, Article, 010309 optics, 03 medical and health sciences, Internal medicine, 0103 physical sciences, Occlusion, medicine, 030304 developmental biology, 0303 health sciences, Abductor pollicis brevis muscle, business.industry, Blood flow, Laser Doppler velocimetry, Atomic and Molecular Physics, and Optics, body regions, medicine.anatomical_structure, Cardiology, business, human activities, Biotechnology
Abstract

A practical assessment of the general health and microvascular function of the palm muscle, abductor pollicis brevis (APB), is important for the diagnosis of different conditions. In this study, we have developed a protocol and a probe to study microvascular blood flow using near-infrared diffuse correlation spectroscopy (DCS) in APB during and after thumb abduction at 55% of maximum voluntary contraction (MVC). Near-infrared time resolved spectroscopy (TRS) was also used to characterize the baseline optical and hemodynamic properties. Thirteen (n=13) subjects were enrolled and subdivided in low MVC (N=6, MVC

Published
2021
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2. Measurement of haemodynamics of exercising and non-exercising vastus lateralis muscle with hybrid diffuse optics

Author

Lorenzo Spinelli, Rebecca Re, Martina Giovannella, Evelina Urtane, Victor Chamizo, Turgut Durduran, Udo M. Weigel, and Zbignevs Marcinkevics

Subjects
business.industry, Chemistry, Vastus lateralis muscle, Near-infrared spectroscopy, Hemodynamics, Diffuse correlation spectroscopy, 01 natural sciences, 010309 optics, 03 medical and health sciences, 0302 clinical medicine, Optics, Mechanics of Materials, 0103 physical sciences, Electronic, Electronic, Optical and Magnetic Materials, Optical and Magnetic Materials, Medical optics and biotechnology, Time-resolved spectroscopy, Blood or tissue constituent monitoring, business, Spectroscopy, 030217 neurology & neurosurgery, Light propagation in tissues
Abstract

We present simultaneous diffuse correlation spectroscopy (DCS) and time resolved spectroscopy (TR NIRS) measurements on exercising and non-exercising vastus lateralis muscle. We discuss the results at two different exercise levels.

Published
2016

3. Imaging photoplethysmography for clinical assessment of cutaneous microcirculation at two different depths

Author

Evelina Urtane, Aleksejs Miščuks, Liga Ozolina-Moll, Uldis Rubins, Zbignevs Marcinkevics, and Janis Zaharans

Subjects
Adult, Pathology, medicine.medical_specialty, Adolescent, Biomedical Engineering, Liniment, Hyperemia, Cutaneous microcirculation, 02 engineering and technology, Administration, Cutaneous, 01 natural sciences, Microcirculation, 010309 optics, Biomaterials, Young Adult, Photoplethysmogram, 0103 physical sciences, Image Processing, Computer-Assisted, Humans, Medicine, Photoplethysmography, Skin, business.industry, Equipment Design, Laser Doppler velocimetry, Hand, 021001 nanoscience & nanotechnology, Arterial occlusion, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, 0210 nano-technology, business, Perfusion, Preclinical imaging, Anesthesia, Local, Biomedical engineering
Abstract

The feasibility of bispectral imaging photoplethysmography (iPPG) system for clinical assessment of cutaneous microcirculation at two different depths is proposed. The iPPG system has been developed and evaluated for in vivo conditions during various tests: (1) topical application of vasodilatory liniment on the skin, (2) skin local heating, (3) arterial occlusion, and (4) regional anesthesia. The device has been validated by the measurements of a laser Doppler imager (LDI) as a reference. The hardware comprises four bispectral light sources (530 and 810 nm) for uniform illumination of skin, video camera, and the control unit for triggering of the system. The PPG signals were calculated and the changes of perfusion index (PI) were obtained during the tests. The results showed convincing correlations for PI obtained by iPPG530 nm and LDI at (1) topical liniment (r = 0.98) and (2) heating (r = 0.98) tests. The topical liniment and local heating tests revealed good selectivity of the system for superficial microcirculation monitoring. It is confirmed that the iPPG system could be used for assessment of cutaneous perfusion at two different depths, morphologically and functionally different vascular networks, and thus utilized in clinics as a cost-effective alternative to the LDI.

Published
2016
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