Publications de Mathieu Lemay | EPFL Graph Search

Non-invasive pulmonary artery pressure estimation by electrical impedance tomography in a controlled hypoxemia study in healthy subjects

Jean-Philippe Thiran, Mathieu Lemay, Martin Proença, Fabian Braun

Pulmonary hypertension is a hemodynamic disorder defined by an abnormal elevation of pulmonary artery pressure (PAP). Current options for measuring PAP are limited in clinical practice. The aim of this study was to evaluate if electrical impedance tomograp ...

NATURE RESEARCH2020

Noninvasive measurement of stroke volume changes in critically ill patients by means of electrical impedance tomography

Jean-Philippe Thiran, Mathieu Lemay, Martin Proença, Fabian Braun

Previous animal experiments have suggested that electrical impedance tomography (EIT) has the ability to noninvasively track changes in cardiac stroke volume (SV). The present study intended to reproduce these findings in patients during a fluid challenge. ...

SPRINGER HEIDELBERG2020

Can one detect atrial fibrillation using a wrist-type photoplethysmographic device?

Jean-Marc Vesin, Philippe Renevey, Célestin Leupi, Mathieu Lemay, Sibylle Fallet, Etienne Pruvot

This study aims at evaluating the potential of a wrist-type photoplethysmographic (PPG) device to discriminate between atrial fibrillation (AF) and other types of rhythm. Data from 17 patients undergoing catheter ablation of various arrhythmias were proces ...

SPRINGER HEIDELBERG2019

Influence of heart motion on cardiac output estimation by means of electrical impedance tomography: a case study

Jean-Philippe Thiran, Mathieu Lemay, Martin Proença, Michaël Rapin, Fabian Braun

Electrical impedance tomography (EIT) is a non-invasive imaging technique that can measure cardiac-related intra-thoracic impedance changes. EIT-based cardiac output estimation relies on the assumption that the amplitude of the impedance change in the vent ...

Iop Publishing Ltd2015

The Respiration Pattern as an Indicator of the Anaerobic Threshold

Jean-Marc Vesin, Mathieu Lemay, Leila Mirmohamadsadeghi

The anaerobic threshold (AT) is a good index of personal endurance but needs a laboratory setting to be determined. It is important to develop easy AT field measurements techniques in order to rapidly adapt training programs. In the present study, it is po ...

2015

Predicting Acute Hypotensive Episodes

Jean-Marc Vesin, Florian Jousset, Mathieu Lemay

The goal of the challenge 2009 is to predict which patients will experience acute hypotensive episode (AHE) within a forecast window. AHE may result in dangerous complications and even death. Predicting the onset of AHE would be of clear benefit to a patie ...

2009

Activity Level of an Atrial Ectopic Focus Observed Through the Equivalent Dipole: a Biophysical Model

Vincent Jacquemet, Jean-Marc Vesin, Mathieu Lemay, Cédric Duchene

Quantifying the role of atrial ectopic foci in the initiation and the maintenance of atrial fibrillation (AF) is a relevant clinical problem. This study aims at assessing the relation between the activity level of an ectopic focus and the complexity of the ...

2009

Adaptive Multiple Frequency Tracking Algorithm: Detection of Stable Atrial Fibrillation Sources from Standard 12-Lead ECG

Vincent Jacquemet, Jean-Marc Vesin, Mathieu Lemay, Cédric Duchene

The detection of stable atrial fibrillation (AF) sources remains one of the major challenges in the AF management. In this study, we investigated the feasibility of detecting stable AF sources from (non invasive) data simulated by means of numerical proced ...

2009

The Role of Atrial Modeling in the Development of ECG Processing Tools

Vincent Jacquemet, Jean-Marc Vesin, Lukas Kappenberger, Mathieu Lemay, Laurent Renaud Uldry, Cédric Duchene

The standard ECG remains the most common non-invasive tool for assessing atrial fibrillation. Specific signal processing techniques have been developed to improve the diagnosis. However, validation of such tools is challenging and comprehensive invasive da ...

2009

Estimation of Atrial Multiple Reentry Circuits from Surface ECG Signals based on a Vectorcardiogram Approach

Jean-Marc Vesin, Mathieu Lemay, Cédric Duchene

This paper presents a simulation study on the identifiability of multiple reentrant circuits on the basis of the vectorcardiogram. The methods involved include an advanced tracking of the basic frequencies of the dominant rotors and a supporting identifica ...

Spinger2009

Computers in Cardiology / Physionet Challenge 2009: Predicting Acute Hypotensive Episodes

Jean-Marc Vesin, Florian Jousset, Mathieu Lemay

The goal of the Computers in Cardiology / Physionet Challenge 2009 is to predict which patients will experience acute hypotensive episode within a forecast window of one hour. In our study, statistically robust features extracted from the supplied training ...

2009

Adaptive Multiple Frequency Tracking Algorithm used to Detect Stable Atrial Fibrillation Sources from standard 12-lead ECG

Jean-Marc Vesin, Mathieu Lemay, Cédric Duchene

2009

Development of a toolbox for electrocardiogram-based interpretation of atrial fibrillation

Jean-Marc Vesin, Lukas Kappenberger, Mathieu Lemay

Elsevier2009

Full Spectral Analysis of the Atrial Components in the ECG during Atrial Fibrillation

Lukas Kappenberger, Mathieu Lemay

Clinical standard 12-lead ECG recordings over 5 minutes on patients in atrial fibrillation or in atrial flutter were analyzed. After suppression of the signal components related to ventricular activity, the amplitude spectra of all leads were inspected. Th ...

IEEE2008

Adaptive Frequency Tracking on the ECG Used to Predict the Success of Electrical Cardioversion of Atrial Fibrillation

Jean-Marc Vesin, Yann Prudat, Mathieu Lemay, Frank Grégoire Jean de Morsier

One of the rhythm control strategies in atrial fibrillation management consists in the application of a brief single electrical shock to the atria. This electrical cardioversion does not always succeed, and the long-term success of this therapy is not suff ...

IEEE2008

Phase-Rectified Signal Averaging Used to Estimate the Dominant Frequencies in ECG Signals During Atrial Fibrillation

Vincent Jacquemet, Jean-Marc Vesin, Yann Prudat, Mathieu Lemay

2008

Spectral analysis of the ECG identifies dominant rotors during atrial fibrillation

Vincent Jacquemet, Lukas Kappenberger, Mathieu Lemay

2008

Quasi-Periodic Atrial Activity Components in the ECG Used to Discriminate between Paroxysmal and Chronic Atrial Fibrillation

Lam Dang, Jean-Marc Vesin, Mathieu Lemay

IEEE2008

Data processing techniques for the characterization of atrial fibrillation

Mathieu Lemay

Atrial fibrillation is the most common sustained cardiac rhythm disturbance, increasing in prevalence with age. During the past 20 years, there has been a 66% increase in hospital admissions related to atrial fibrillation. Neither the natural history of at ...

EPFL2008

Phase-Rectified Signal Averaging. A useful Tool for the Estimation of the Dominant Frequency in ECG Signals during Atrial Fibrillation

Vincent Jacquemet, Jean-Marc Vesin, Yann Prudat, Mathieu Lemay

2007