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Related Concept Videos

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...
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...
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...
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase of...
Cardiac Action Potential01:30

Cardiac Action Potential

Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials

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Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Published on: April 11, 2025

What is inside the electrocardiograph?

Richard E Gregg1, Sophia H Zhou, James M Lindauer

  • 1Advanced Algorithm Research Center, Philips Medical Systems, 3 Andover, MA 01810, USA. rich.gregg@philips.com

Journal of Electrocardiology
|January 15, 2008
PubMed
Summary
This summary is machine-generated.

Understanding electrocardiograph (ECG) design tradeoffs is crucial for accurate recordings and interpretations. This tutorial explains engineering choices in ECG devices, helping healthcare professionals improve signal quality and reduce artifact interference.

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Area of Science:

  • Biomedical Engineering
  • Medical Instrumentation

Background:

  • Digital electrocardiogram (ECG) recording and processing present challenges for healthcare professionals.
  • Understanding electrocardiograph design and performance tradeoffs can enhance ECG quality and interpretation.

Purpose of the Study:

  • To provide an engineering tutorial on electrocardiograph design for those new to ECG.
  • To clarify the engineering tradeoffs involved in ECG signal acquisition and processing.

Main Methods:

  • The paper details the two main components of an electrocardiograph: the patient module for signal acquisition and the processing unit.
  • Explains signal amplification, digitization, and the use of filters (high-pass, low-pass, notch) for artifact reduction.

Main Results:

  • Filters used to reduce artifacts like baseline sway and muscle noise can also distort the ECG signal (e.g., attenuating R waves, distorting ST segments).
  • Proper skin preparation and electrode placement can minimize artifacts, potentially reducing the need for aggressive filtering.

Conclusions:

  • A clear understanding of electrocardiograph engineering principles and filter tradeoffs is essential for optimizing ECG recording and interpretation.
  • Minimizing artifacts at the source through good practice is preferable to relying solely on digital filtering.