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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...
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
Pulse rhythm01:30

Pulse rhythm

Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac muscle...

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Related Experiment Video

Updated: May 8, 2026

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
18:11

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

Published on: December 28, 2012

The Stanford/PAVA data collection form for coding J waves on routine screening 10second ECGs.

Muhammad Soofi1, Divya Saini, Victor Froelicher

  • 1The Ohio State University College of Medicine, Columbus, OH, USA. soofi.2@osu.edu

Journal of Electrocardiology
|August 29, 2013
PubMed
Summary

Standardizing electrocardiogram (ECG) coding for J waves and slurs is crucial for understanding their link to cardiovascular death. A new Data Entry Form addresses key coding ambiguities in ECG patterns.

Keywords:
Cardiovascular deathECGJ waves

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Measuring Cardiac Autonomic Nervous System (ANS) Activity in Children
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Measuring Cardiac Autonomic Nervous System (ANS) Activity in Children

Published on: April 29, 2013

Related Experiment Videos

Last Updated: May 8, 2026

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
18:11

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

Published on: December 28, 2012

Measuring Cardiac Autonomic Nervous System (ANS) Activity in Children
09:45

Measuring Cardiac Autonomic Nervous System (ANS) Activity in Children

Published on: April 29, 2013

Area of Science:

  • Cardiology
  • Electrocardiography
  • Medical Informatics

Background:

  • J waves and slurs on ECGs are associated with cardiovascular death.
  • Current coding lacks standardization, hindering research and clinical application.

Purpose of the Study:

  • To develop and validate a standardized Data Entry Form for ECG patterns, specifically J waves and slurs.
  • To resolve key ambiguities in ECG interpretation and coding.

Main Methods:

  • Evolved a comprehensive Data Entry Form over three years.
  • The form addresses issues like the influence of other ECG findings, QRS-ST junction timing relative to J waves, lead contiguity, and differentiation from fragmented QRS complexes.
  • Currently coding ECGs for 44,000 VA patients.

Main Results:

  • The developed Data Entry Form systematically codes ECG findings related to J waves and slurs.
  • Data collection is ongoing for a large patient cohort (44,000 VA patients).

Conclusions:

  • The new Data Entry Form provides a standardized methodology for coding J waves and slurs.
  • Extended follow-up (15 years) will help resolve ambiguities and clarify the association with cardiovascular death.