Concept

Heart sounds

Related publications (50)

Transfer matrices for deriving the vectorcardiogram: a consumer guide

Background In the literature, several different transfer matrices have been presented for deriving the vectorcardiogram (VCG) from the signals observed using a limited set of electrodes. Even when the electrode locations were identical, like 9 of the stand ...

2007

Adaptation of the standard 12-lead electrocardiogram system dedicated to the analysis of atrial fibrillation

Vincent Jacquemet, Zenichi Ihara

Objective: The objective of the study was to design a lead system aimed at studying atrial fibrillation (AF), while being anchored to the standard 12-lead system. Methods: The location of 4 of the 6 precordial electrodes was optimized while leaving the rem ...

2007

Analysing the potential of Reveal for monitoring cardiac potentials

Aims The implantable loop recorder (ILR) continuously monitors the heart’s electric activity by means of a subcutaneous bipolar electrogram (Elg). Currently, the relationship between the Elg and the surface electrocardiogram (ECG) has been poorly documente ...

2007

The effect of a myocardial infarction on the normalized time-varying elastance curve

Nikolaos Stergiopoulos, Rafaela Fernandes Da Silva, David Jegger

It has been suggested that the shape of the normalized time-varying elastance curve [E(n)(t(n))] is conserved in different cardiac pathologies. We hypothesize, however, that the E(n)(t(n)) differs quantitatively after myocardial infarction (MI). Sprague-Da ...

2006

GLUT8 is dispensable for embryonic development but influences hippocampal neurogenesis and heart function

Friedrich Beermann

GLUT8 is a glucose transporter isoform expressed at high levels in testis; at intermediate levels in the brain, including the hippocampus; and at lower levels in the heart and several other tissues. GLUT8 is located in an intracellular compartment and does ...

2006

Myocardial Motion Analysis from B-Mode Echocardiograms

Michaël Unser, Michael Sühling, Muthuvel Arigovindan

The quantitative assessment of cardiac motion is a fundamental concept to evaluate ventricular malfunction. We present a new optical-flow-based method for estimating heart motion from two-dimensional echocardiographic sequences. To account for typical hear ...

IEEE2005

Cardiac Ultrasound Motion Detection by Elastic Registration Exploiting Temporal Coherence

Michaël Unser, Michael Sühling

We propose a new global registration method for estimating the cardiac displacement field in 2D sequences of ultrasound images of the heart. The basic idea is to select a reference frame (e.g., the first image of a cycle) and to map each image in the seque ...

IEEE2002

Cardiac Motion Analysis from Ultrasound Sequences Using Non-Rigid Registration

Michaël Unser

In this article we propose a cardiac motion estimation technique that uses non-rigid registration to compute the dense cardiac displacement field from 2D ultrasound sequences. Our method employs a semi-local deformation model which provides controlled smoo ...

MICCAI2001

Scatter in input impedance spectrum may result from the elastic nonlinearity of the arterial wall

Nikolaos Stergiopoulos, Jean-Jacques Meister, Nico Westerhof

We have examined the role of the nonlinear elastic properties of the arterial wall on the human aortic input impedance obtained at different heart rates and different pressure and flow wave shapes. Pressure and flow were taken from a computer model that pr ...

American Physiological Society1995

Méthodologie de conception d'activateurs pour ventricule d'assistance cardiaque implantable

Yves Perriard

The electronic miniaturization and the computer evolution (microprocessor, transputer) have contributed to the use of electric drives in a lot of applications. Because of its flexibility, the electric drive becomes an essential element to work out new conc ...

EPFL1992

Graph Chatbot

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.