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Related Concept Videos

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
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...
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...
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...

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Related Experiment Video

Updated: Jun 25, 2026

Electrophysiological Assessment of Murine Atria with High-Resolution Optical Mapping
08:19

Electrophysiological Assessment of Murine Atria with High-Resolution Optical Mapping

Published on: February 22, 2018

Estimating atrial action potential duration from electrograms.

Edward J Vigmond1, Vincent Tsoi, Yalin Yin

  • 1Department of Electrical and Computer Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada. vigmond@ucalgary.ca

IEEE Transactions on Bio-Medical Engineering
|February 25, 2009
PubMed
Summary
This summary is machine-generated.

Activation recovery interval (ARI) estimates atrial action potential duration (APD) poorly. However, the area under the repolarization wave (ATa) robustly identifies spatial APD heterogeneities, crucial for atrial research.

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Area of Science:

  • Cardiac Electrophysiology
  • Computational Biology
  • Medical Imaging

Background:

  • Activation recovery interval (ARI) is used to measure ventricular action potential duration (APD).
  • The suitability of ARI for estimating atrial APD remains unaddressed.
  • Atrial repolarization mapping is critical during nerve stimulation due to potential heterogeneous APD changes.

Purpose of the Study:

  • To assess the utility of electrograms for estimating atrial APD.
  • To compare ARI and the area under the repolarization wave (ATa) for APD estimation in the atria.
  • To investigate the impact of acetylcholine (ACh) on atrial APD and its electrographic representation.

Main Methods:

  • A computer model simulated atrial and ventricular electrograms.
  • APD was modulated using an ACh-dependent potassium channel and varying spatial ACh distribution.
  • ARI, ATa, and APD were computed; atrial electrograms were compared to dog monophasic action potentials.

Main Results:

  • ARI showed significant imprecision (over 30 ms errors) in estimating atrial APD.
  • Estimating APD changes induced by ACh variations resulted in larger errors.
  • Ventricular APs yielded ARIs that closely correlated with APD, unlike atrial APs.
  • ATa effectively demarcated regions of shortened APD and ACh release islands.
  • Experimentally, ARI detected APD changes but lacked precision; ATa precisely identified spatial APD heterogeneities.

Conclusions:

  • ARI is imprecise for quantifying atrial APD, particularly when modulated by ACh.
  • The area under the repolarization wave (ATa) is a robust method for precisely identifying spatial APD heterogeneities in the atria.
  • Electrograms can detect atrial APD changes, potentially improved by reduced electrotonic coupling.