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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

1.6K
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...
1.6K
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

150
Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
150
Cardiac Action Potential01:30

Cardiac Action Potential

567
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
567
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

431
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...
431
Correlation between ECG and Cardiac Cycle01:24

Correlation between ECG and Cardiac Cycle

2.7K
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...
2.7K
Disturbances in Heart Rhythm01:28

Disturbances in Heart Rhythm

705
Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow...
705

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Related Experiment Video

Updated: May 9, 2025

Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice
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Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice

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Atypical de Winter ECG: What is the Culprit?

Dita Aulia Rachmi1, Eka Prasetya Budi Mulia1,2, Rosi Amrilla Fagi1

  • 1Department of Cardiology and Vascular Medicine, Dr Soetomo General Hospital, Universitas Airlangga Faculty of Medicine, Surabaya, Indonesia.

The Journal of Tehran Heart Center
|May 5, 2025
PubMed
Summary
This summary is machine-generated.

The de Winter ECG pattern

Keywords:
Culprit arteryPosterolateralST-segment elevation myocardial infarction

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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
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Area of Science:

  • Cardiology
  • Electrocardiography
  • Myocardial Infarction

Background:

  • Electrocardiogram (ECG) patterns are crucial for localizing coronary artery occlusions and assessing myocardial ischemia.
  • The de Winter ECG pattern's utility in predicting acute left anterior descending artery occlusion has shown inconsistent diagnostic accuracy.
  • Variations in ST depression morphology and other ECG findings impact prognostic significance.

Observation:

  • This case highlights the diagnostic challenge posed by the de Winter ECG pattern.
  • The study emphasizes the need to consider the de Winter pattern in conjunction with other ECG markers.
  • Specific ECG findings analyzed include ST elevation, Q waves, and the R/S ratio.

Findings:

  • Integrating multiple ECG findings, including the de Winter pattern's location across leads, is essential for accurate diagnosis.
  • A comprehensive ECG analysis improves the prediction of the culprit artery in acute coronary syndromes.
  • Combining ST elevation, Q waves, R/S ratio, and de Winter pattern location enhances diagnostic precision.

Implications:

  • Accurate prediction of the culprit artery and ischemic extent can guide timely and appropriate treatment strategies.
  • This integrated ECG approach may improve patient outcomes in acute myocardial infarction.
  • Clinicians should consider a multi-faceted ECG interpretation for suspected coronary artery occlusion.