Machbarkeitsstudie zur photoplethysmographischen Diagnose der peripheren Verschlusskrankheit der Beinarterien
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Philipps-Universität Marburg
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Abstract
In this study non-contact photoplethysmography was used to measure perfusion signals in patients with known peripheral arterial disease of the lower leg. Between oxygenated and deoxygenated blood there’s a difference of absorption in light emission whereas it’s possible to evaluate the perfusion. In this study we used a digital camera to record high resolute colour sequences (640-pixel x 480-pixel) of the lower legs, particularly from knee to ankle. Every record was approximately 60 seconds long and 30 high resolute pictures were created every second.
52 patients with diagnosed peripheral arterial disease were recruited and both lower legs were recorded in 3 different positions (0cm, 20cm and 40 cm elevation) with non-contact photoplethysmography. In addition, the ankle-brachial-index was measured in 0cm and 40cm elevation by a modified Bürgertest.
Overall, with non-contact photoplethysmography a perfusion signal could be recorded statistically significant from every patient.
The results were correlated with the data of the ankle-brachial-index. A stronger perfusion signal was measured with increasing elevation heigh and an ankle-brachial-index >0,9. These results were statistically significant and unexpected. Additionally, the perfu-sion signal was weaker by severe peripheral arterial disease. Currently there is no linear correlation between the intensity of the perfusion signal and the heigh of the elevation.
The increased perfusion signal by increasing elevation heigh is interpreted as possible venous pooling effect.
The perfusion signal recorded by non-contact photoplethysmography was correlated with the Fontaine classification of peripheral arterial disease. In this regard there was no correlation between these two factors.
Altogether non-contact photoplethysmography has the potential of being an additional diagnostic tool. Nevertheless, there is the need of additional studies on non-contact photoplethysmography to reduce possible disturbing factors while taking the records and optimize the procedure. Additionally, there is the need of testing non-contact photoplethysmography on a wider patient collective.
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Created: 2022Issued: 2022-07-04Updated: 2022-07-04
Faculty
Medizin
Publisher
Philipps-Universität Marburg
Language
ger
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DoctoralThesis
Keywords
non-contactphotoplethysmographyPADdiagnosisperipheral artery disease
DFG-subjects
Photoplethysmographieperiphere arterielle VerschlusserkrankungkontaktlosDiagnosepAVKFotoplethysmografieDiagnostik
DDC-Numbers
610
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Asbach-Göttig, Melanie: Machbarkeitsstudie zur photoplethysmographischen Diagnose der peripheren Verschlusskrankheit der Beinarterien. : Philipps-Universität Marburg 2022-07-04. DOI: https://doi.org/10.17192/z2022.0263.
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This item has been published with the following license: In Copyright