Contact-Free Optical Assessment of Changes in the Chest Wall Perfusion after Coronary Artery Bypass Grafting by Imaging Photoplethysmography
Source abstract
Abstract
Imaging photoplethysmography (iPPG) is a contact-free monitoring of the cutaneous blood volume pulse by RGB (red-green-blue) cameras. It detects vital parameters from skin areas and is associated to cutaneous perfusion. This study investigated the use of iPPG to quantify changes in cutaneous perfusion after major surgery. Patients undergoing coronary artery bypass grafting (CABG) were scanned before surgery and in three follow-up measurements. Using an industrial-grade RGB camera and usual indoor lighting, a contact-free imaging plethysmogram from the chest was obtained. Changes of the iPPG signal strength were evaluated in view of both the operation itself as well as the unilateral preparation of the internal thoracic artery (ITA) for coronary artery grafting, which is the main blood source of the chest wall. iPPG signal strength globally decreased after surgery and recovered partially during the follow up measurements. The ITA preparation led to a deeper decrease and an attenuated recovery of the iPPG signal strength compared to the other side of the chest wall. These results comply with the expected changes of cutaneous perfusion after CABG using an ITA graft. iPPG can be used to assess cutaneous perfusion and its global changes after major surgery as well as its local changes after specific surgical procedures.
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Research context
OpenAlex topics: Non-Invasive Vital Sign Monitoring · Hemodynamic Monitoring and Therapy · Optical Imaging and Spectroscopy Techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Interdisciplinary Intensive Care Unit, Neurology Clinic, Klinikum Bayreuth, 95445 Bayreuth, Germany
Institute of Biomedical Engineering, Faculty of Electrical and Computer Engineering, Technical University Dresden, 01307 Dresden, Germany
Department of Cardiac Surgery, Heart Center Dresden, 01307 Dresden, Germany
Department of Anaesthesiology and Intensive Care Medicine, University Hospital Carl Gustav Carus, Technical University Dresden, 01307 Dresden, Germany
Faculty of Information Technology, Dortmund University of Applied Sciences and Arts, 44139 Dortmund, Germany
Center of Surgical Intensive Care Medicine, Department of Visceral, Thoracic and Vascular Surgery, University Hospital Carl Gustav Carus, Technical University Dresden, 01307 Dresden, Germany
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