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Related Concept Videos

Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin to...
Electrocardiogram01:29

Electrocardiogram

An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and the T...
ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
Components of the Electrocardiogram
The primary components of a normal ECG waveform in Normal sinus rhythm(NSR) include the P wave, PR interval, QRS complex, ST segment, T wave, and occasionally a U wave.
ECG waveforms are divided by vertical and horizontal lines at standard intervals.
The horizontal axis measures time and rate, and the vertical axis measures amplitude or voltage. When...

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Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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12-lead surface electrocardiogram reconstruction from implanted device electrograms.

G Stuart Mendenhall1, Samir Saba

  • 1Department of Cardiac Electrophysiology, University of Pittsburgh Cardiovascular Institute, Pittsburgh, PA, USA. gsmenden@post.harvard.edu

Europace : European Pacing, Arrhythmias, and Cardiac Electrophysiology : Journal of the Working Groups on Cardiac Pacing, Arrhythmias, and Cardiac Cellular Electrophysiology of the European Society of Cardiology
|April 23, 2010
PubMed
Summary
This summary is machine-generated.

Researchers reconstructed a 12-lead surface electrocardiogram (EKG) from implanted biventricular devices. This accurate EKG reconstruction method is computationally lightweight and has potential for remote cardiac monitoring.

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Area of Science:

  • Biomedical Engineering
  • Cardiology
  • Medical Devices

Background:

  • Current pacemakers and cardioverter-defibrillators do not reconstruct surface electrocardiograms (EKGs).
  • Surface EKG reconstruction from implanted leads is a novel area of investigation.

Purpose of the Study:

  • To investigate the feasibility and accuracy of reconstructing a 12-lead surface EKG from an implanted biventricular device.
  • To assess novel reconstruction techniques using intracardiac (IC) vector recordings.

Main Methods:

  • Applied three techniques: single fixed dipole modelling, exhaustive best-fit solution, and time-independent transfer matrix.
  • Utilized voltage recordings from implanted cardiac leads during biventricular generator change in 10 patients.
  • Employed overdetermined projection transformation for EKG reconstruction.

Main Results:

  • High-fidelity surface EKG reproduction was achieved for left-sided implanted devices (correlation coefficient 0.84+/-0.13).
  • The time-independent transfer matrix method demonstrated computational efficiency.
  • Reconstruction showed high accuracy and fidelity.

Conclusions:

  • Individual post-implantation correlation enables accurate surface EKG reproduction using a time-independent transfer matrix.
  • The technique is independent of gating requirements and valid during aberrant depolarization.
  • Potential applications include real-time/remote monitoring for rhythm disturbances, cardiac ischemia, and lead integrity.