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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

3.7K
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...
3.7K
ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

5.3K
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....
5.3K
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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

198
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...
198
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

936
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...
936
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

9.2K
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...
9.2K
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

478
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,...
478

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Related Experiment Video

Updated: Oct 11, 2025

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

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Evolutionary de Winter pattern: from STEMI to de Winter ECG-a case report.

Weijun Huang1, Linlin Mai1, Jianhua Lu1

  • 1Department of Cardiology, Shunde Hospital, Southern Medical University (The First People's Hospital of Shunde), Shunde, Foshan, China.

ESC Heart Failure
|December 1, 2021
PubMed
Summary
This summary is machine-generated.

The de Winter electrocardiogram (ECG) pattern can evolve from ST-segment elevation, indicating an evolving coronary thrombus. This dynamic ECG finding suggests proximal left anterior descending artery occlusion and requires prompt medical attention.

Keywords:
Acute myocardial infarctionPercutaneous coronary interventionPrognosisde Winter syndrome

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Area of Science:

  • Cardiology
  • Emergency Medicine
  • Diagnostic Imaging

Background:

  • The de Winter electrocardiogram (ECG) pattern is a recognized indicator of proximal left anterior descending (LAD) coronary artery occlusion.
  • Early identification of acute coronary syndromes (ACS) is critical for timely intervention and improved patient outcomes.

Observation:

  • A 34-year-old male smoker presented with acute chest pain.
  • Initial ECG showed ST-segment elevation in leads V2-V4.
  • A subsequent ECG, 57 minutes later, revealed the de Winter ECG pattern.

Findings:

  • The patient underwent percutaneous coronary intervention (PCI) approximately 8 hours after symptom onset.
  • Coronary angiography confirmed a complete occlusion of the proximal LAD artery.
  • The case demonstrates the evolution of ST-segment elevation myocardial infarction towards the de Winter ECG pattern.

Implications:

  • The de Winter ECG pattern may represent an evolving coronary thrombus rather than a static finding.
  • Clinicians should consider the dynamic nature of ECG changes in ACS.
  • This case highlights the importance of serial ECG monitoring in patients with chest pain.