CARP LAB

Cardiac Arrhythmia Research Program


Meet Our Team

TEAM LEADER

Edward Vigmond

Team Leader

Academic Background:
PhD in Electrical and Computer Engineering, Institute of Biomedical Engineering, University of Toronto

Research Interests: My research is centered on the computer simulation of cardiac function, primarily electrophysiological, but increasingly multiphysics. I develop and implement mathematical models of the heart using my software, carpentry. Detailed presentations of single cardiac myocytes are assembled together to form tissues and organs. Fine biophysical details are represented in a, accurate geometry derived from imaging. The resulting mathematical systems contain many equations and require powerful computers to solve.
I am interested in preventing and treating cardiac arrhythmias, both in the atria and ventricles. In silico studies have the advantage that we have access to the entire system at every level, instead of limited to a few measurements. Thus, we can relate ion channel function to ECG features, for example. Computer simulation also allows testing and developing new therapies which would otherwise be impossible with patients. However, computer models need to be validated before results obtained with them can be trusted. This is an ongoing task with which I am occupied as well. As such, I am also interested in recreating and interpretating clinical measurements.

edward.vigmond@u-bordeaux.fr

CV

RESEARCHERS

Jason Bayer

Research Scientist

Academic Background:
Biomedical engineer
PhD, Biomedical Engineering, Johns Hopkins School of Medicine
MS, Pharmacology, SUNY Upstate Medical University
BS, Bioengineering, Syracuse University

Research Interests:
• Cardiac electrophysiology
• Computational modeling and simulation
• Ventricular and atrial arrhythmia mechanisms
• Painless low-energy defibrillation
• Ablation strategy optimization
• Optical imaging
• Large animal experimentation
• Cardiac electrical stimulation and recording with conductive fabrics
• 3D printing

I am a biomedical engineer and have an extensive experience in the development of computational heart models for simulating cardiac electrophysiology. Throughout my career I have developed numerous multiscale computational heart models to accurately study cardiac electrophysiology from the cell to organ level. I have combined these models with large animal and clinical studies to better understand the mechanisms of lethal cardiac arrhythmias, as well as to develop novel therapies to prevent/treat these arrhythmias. I have also developed useful algorithms (universal ventricular coordinate system, rule-based fiber orientation, etc.) for interfacing simulation results with clinicians and experimentalists. My current research is focused on the role of the sex-specific differences and the Purkinje network in cardiac arrhythmias and electrotherapies.

Activities:
• Developing novel therapies for low-energy painless defibrillation.
• Investigating the role of sex-specific electrophysiology and anatomy on arrhythmogenesis.
• Developing virtual heart models to test His-pacing and gene therapies for restoring the cardiac conduction system.

jason.bayer@ihu-liryc.fr

Bayer Lab

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Peter Langfield

Research Scientist

Academic background:
I am an applied mathematician, with a PhD from the university of Auckland, New Zealand in 2015 in the field of dynamical systems with Profs. Bernd Krauskopf and Hinke Osinga. My interests turned towards problems in cardiology during a postdoc at McGill University with Prof. Leon Glass, after which I started a postdoc with Ed's team at Liryc in 2017. After successfully passing the Inria concours in 2021, I started a permanent Chargé de Recherche research position in the team of Prof. Yves Coudière.

Research interests:
• Ventricular electrophysiology
• Non-linear dynamics
• Repolarization time abnormalities
• Numerical continuation methods

Activities:
• Typical spatial repolarization patterns in human ventricles
• The origin of atypical biphasic T-waves in unipolar electrograms
• The isochrons of the Hodgkin-Huxley model
• SAdj: Adjoint-based parameter sensitivity analysis toolbox

Peter.Langfield@inria.fr

Website

POSTDOCTORAL FELLOWS

Vladimir Sobota

Postdoctoral Researcher

Academic Background:
I received my master degree in Biomedical Engineering at the Czech Technical University in Prague, Czech Republic, and my PhD in Cardiac Electrophysiology at the Maastricht University, Netherlands, with my PhD project focused on studying the mechanism of action of atrial-specific anti-arrhythmic drugs. I joined the Modeling Team at IHU LIRYC in 2021 as a postdoctoral researcher to work on the project SICVALVES, that was focused on modeling ventricular electrophysiology in patients with aortic stenosis.

Research Interests:
• Cardiac arrhythmias
• Sex-specific differences

In my current research project that is funded by Fondation Lefoulon-Delalande I use computational models of the human ventricles to explore the role of sex-specific differences in ventricular electrophysiology, and their role in arrhythmia vulnerability.

Activities:
I am involved in projects in collaboration with international research institutes:
University of California, Davis. A project funded by the French-Berkley Fund (beneficiaries: Eleonora Grandi, Jason D. Bayer)
Maastricht University (Matthijs Cluitmans, Job Stoks, Paul Volders)
MedUni Graz (Gernot Plank, Christoph Augustin)

I won the ANCRE Communication Award for his talk "My project in 180 seconds". In 2024 I organized a meeting of Czech scientists and scholars working in France at the Embassy of the Czech Republic in Paris.

vladimir.sobota@ihu-liryc.fr

www.vladimirsobota.com

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twitter

Masimba Nemaire

Postdoctoral Researcher

Academic Background:
I have a Bachelor of Science Honours in Mathematics from the University of Zimbabwe. After which I did the Erasmus Mundus Joint Masters degree in Mathematical Modelling for Engineering (MathMods) at the University of L'Aquilla (Italy), the University of Hamburg (Germany) and the University of Nice Sophia Antipolis (now Université Côte d'Azur) (France). I did my master thesis at the Centre Inria d'Université Côte d'Azur on the inverse problem of EEG/MEG. I did my PhD entitled "Problèmes inverses de potentiel et applications à l'éléctromagnétique quasi-statique" at the Institut de Mathématiques de Bordeaux with Prof. Stanislas Kupin and Dr. Juliette Leblond

Research Interests:
My research interests are primarily in cardiac electrophysiology modelling and inverse potential problems. My work revolves around potential theory, functional analysis, optimisation and numerical methods. My work on cardiac electrophysiology involves insilico modelling of arrhythmogenic substrates based on clinical signals and hypothesis by clinicians. The inverse problems I am interested in stem from problems in cardiology, functional and clinical brain imaging and geomagnetism with my work mainly being the development of numerical algorithms.

Activities:
I am currently working on a project to study the scale at which arrythmogenic substrates generate signals that are detectable on the body surface. This is being done as part of a larger project to develop a non-invasive diagnostic tool for cardiac arrythmias. I am also working on an automated system for ECG signal classification and 3D electrocardiographic imaging algorithm.

masimba.nemaire@ihu-liryc.fr

Jafar Moradi

Postdoctoral Researcher

Academic Background:
During my research journey, I have worked with numerical simulations, focusing on biomechanics. My doctoral research utilized the finite element method (FEM) to study cardiopulmonary resuscitation (CPR), analyzing tissue behavior with various models and exploring resuscitation techniques through computational simulations. In vascular engineering, I employed computational fluid dynamics (CFD) and fluid-structure interaction (FSI) to investigate blood flow and its interaction with vascular structures. This involved using turbulent and non-Newtonian models to accurately characterize vessel properties. These techniques provided valuable insights into the complex hemodynamic behavior of blood flow and its impact on vascular structures.

Research Interests:
• Biomechanics
• Computational Fluid Dynamics (CFD)
• Fluid-Structure Interactions (FSI)
• Finite Element Method (FEM)
• Modeling and Computer Simulation

Activities:
In my current position in the modeling group at the Liryc Institute, I am working on the electromechanical simulation of the ventricles, specifically focusing on Ventricular Scar-Mediated Arrhythmogenesis.

jafar.moradicheghamahi@u-bordeaux.fr

linkedin

Fakhr Bader

Postdoctoral Researcher

Academic ackground:
PhD in Applied Mathematics

Research interests:
• Partial Differential Equations
• Homogenization Theory
• Asymptotic and Multiscale Analysis
• Cardiac electrophysiology
• Numerical Simulation

Activities:
Atrial fibrillation is a heart rhythm disorder that causes the heart muscle to beat faster and more irregularly. Its onset is favored by aging, the presence of cardiac pathology (hypertension, heart valve disease…), obesity, or obstructive sleep apnea syndrome… It remains difficult to treat, as the rate of recurrence of atrial fibrillation after ablation remains high. This project investigates the influence of structural and electrical heterogeneity on atrial fibrillation on an unprecedented scale, both in initiation and maintenance. The aim of this post-doc is to create very high-resolution atrial models incorporating data on shape, fiber architecture, fibrosis and electrical remodeling.

fakhrielddine.bader@u-bordeaux.fr

website

linkedin

RESEARCH ENGINEERS

Sara Zein

Research Engineer

Academic background:
PhD in Physics
Radiation-matter interactions and medical applications

Research interests:
• 3D modeling
• Medical imaging and image processing
• Monte Carlo simulations
• Radiobiology
• Dosimetry and microdosimetry

Activities:
I joined the team as a research engineer and I provid them with technical support. I created and maintain the team's website and I am in charge of data organisation and installing software. I have a PhD in Particle and Radiation Physics for medical applications. I also have a strong background in simulations, imaging and radiotherapy. I am interested in 3D modeling of biological structures on microscopic and organ scales and I enjoy programming.

sara.zein@ihu-liryc.fr

PHD STUDENTS

Hamed Hosseini

PhD Student

Academic Background:
I studied my Bachelor in Biomedical Engineering and my first master was in Biomechanics. After that I started my career in Cardiac Electrophysiology. After 10 years of experience I obtained my Master 2 degree in Cardiac EP

Research Interests:
Atrial Fibrillation, Computational Modeling, Cardiac Electrophysiology, Cardiac Pathophysiology, Sinoatrial Node

Activities:
My main focus during my PhD project is on atrial computer modeling. I am a part of Dawn-AF project and in this project, I am trying to study the effect of different connection in the atria on the probability of arrhythmia induction. I am working on different data acquired from patients undergoing atrial fibrillation ablation procedure.

seyedhamed.hosseini@ihu-liryc.fr

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OUR COLLABORATORS

ALUMNI


Contact
Heart Rythm Disease Institute - IHU Liryc
Hôpital Xavier Arnozan
Avenue du Haut Lévêque
33604 Pessac - France