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Integrated Numerical Model for Hemodynamic Simulation of Human Atria Under Atrial Fibrillation by Coupling 3D Electrophysiological Activity 9th

Integrated Numerical Model for Hemodynamic Simulation of Hum...

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9th Latin American Congress on Biomedical Engineering, CLAIB 2022 and 28th Brazilian Congress on Biomedical Engineering, CBEB 2022

作者： Lameu, João Siles, Jimena G. Sandoval, Italo McInnis, Melissa Salinet, João HEartLab - Biomedical Engineering Federal University of ABC São Bernardo do Campo Brazil Graduate Program in Biotechnoscience Federal University of ABC São Paulo Brazil

ISBN: (纸本)9783031494000

Atrial Fibrillation (AF) is the most common cardiac arrhythmia, increasing the chance of ischemic events five-fold. AF is characterized by fast and abnormal electrical activity, leading to disturbance in atrial contraction, resulting in pro-thrombotic zones due to blood stagnation. Literature shows that hemodynamic modeling using Computational Fluid Dynamics (CFD) has been used to evaluate the hemodynamic outcomes of atria chambers under AF;however, with simplifications related to the electromechanical effects of AF. This study aims to present an integrated analysis by coupling electrophysiological information to a hemodynamic model. A patient undergoing an electrophysiology study was enrolled. Firstly, the patient underwent Magnetic Resonance Imaging (MRI) scan, followed by an electrophysiology study. From MRI images, atrial shell was segmented through a semiautomatic image processing pipeline. Then, multi-electrode catheters were used to acquire electrophysiology signals, allowing determination of local activation times in the 3D atria shell. The 3D mapping provided AF activation patterns used as boundary conditions in the hemodynamic model. The mechanical effects from AF activity were coupled into the blood flow using a momentum method, allowing the local oscillatory wall motion to be mimicked due to the AF activity and its propagation effects through the blood flow. Statistical analysis of fundamental hemodynamic field properties (pressure and wall shear stress, WSS) exhibited a higher dispersion when considering the momentum method. The hemodynamic field presented larger pro-thrombotic zones (WSS ≤ 0.1 Pa) when considering the wall effects of AF activity © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Computational fluid dynamics

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Panoramic Optical Mapping Setup in a Langendorff Perfused Rabbit Heart for the Study of Atrial Fibrillation 9th

Panoramic Optical Mapping Setup in a Langendorff Perfused ...

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9th Latin American Congress on Biomedical Engineering, CLAIB 2022 and 28th Brazilian Congress on Biomedical Engineering, CBEB 2022

作者： Siles, Jimena Uzelac, Ilija Sandoval, Italo Silva, Vinicius Weber, Giovanni Correia, Rhuan Salinet, João Graduate Program in Biotechnoscience Federal University of ABC São Paulo Brazil HEartLab Federal University of ABC São Paulo Brazil Georgia Institute of Technology School of Physics Georgia United States

ISBN: (纸本)9783031494000

Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia in clinical practice, affecting up to 2% of the world’s population and becoming an important public health problem. Basic and clinical research has significantly improved the diagnosis and treatment of AF. Current commercial electrical mapping systems are prone to errors and it is challenging to characterize and locate the AF arrhythmogenic sources correctly for certain types of AF [1]. Due to its non-invasive and high spatiotemporal resolution, optical mapping has helped researchers to improve current knowledge of AF. This study presents preliminary results from three rabbit’s heart experiments, obtained with a Langendorff perfusion setup assembled to a panoramic optical mapping setup, with three optical cameras and high-power LEDs, automatically managed by an in-house developed user graphical unit interface (GUI). Fluorescence obtained after dye excitation was recorded using three special cameras, and data was processed to present the normalized optical action potential (OAP) maps. A 3D heart surface reconstruction equipment records a series of images around the whole heart to obtain a 3D mesh and project the normalized OAP maps. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Heart

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