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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

8.2K
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...
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ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

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

Correlation between ECG and Cardiac Cycle

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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...
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Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

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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...
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Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

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

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

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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...
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Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice
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[Analysis of pacemaker ECGs].

Carsten W Israel1, Lucy Ekosso-Ejangue, Mohamed-Karim Sheta

  • 1Klinik für Innere Medizin - Kardiologie, Diabetologie & Nephrologie, Evangelisches Krankenhaus Bielefeld, Burgsteig 13, 33617, Bielefeld, Deutschland, Carsten.Israel@evkb.de.

Herzschrittmachertherapie & Elektrophysiologie
|August 15, 2015
PubMed
Summary
This summary is machine-generated.

A systematic approach to analyzing pacemaker electrocardiograms (ECG) is crucial for accurate diagnosis. This method helps identify arrhythmias and pacemaker malfunctions, leading to improved patient outcomes.

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Area of Science:

  • Cardiology
  • Medical Devices

Background:

  • Pacemaker electrocardiogram (ECG) analysis requires a systematic approach, similar to standard ECG interpretation.
  • Key analytical components include rhythm, rate, QRS axis, intervals (PQ, QRS, QT), wave morphology, and arrhythmia detection.

Purpose of the Study:

  • To emphasize the importance of a systematic approach in pacemaker ECG interpretation.
  • To highlight potential diagnostic pitfalls and overlooked abnormalities when a systematic method is not employed.

Main Methods:

  • Applying a systematic analysis framework to pacemaker ECGs.
  • Evaluating basic rhythm, rate, QRS axis, intervals, and wave morphology.
  • Assessing for arrhythmias, pacemaker malfunctions (e.g., sensing issues, loss of capture), and specific pacing algorithms.

Main Results:

  • A systematic approach prevents erroneous conclusions often drawn from focusing on isolated abnormalities.
  • It ensures detection of critical issues like ineffective atrial pacing, incorrect ventricular pacing, pacing competition, and inappropriate AV delays.
  • Comprehensive analysis aids in identifying arrhythmias and pacemaker malfunctions.

Conclusions:

  • Systematic pacemaker ECG analysis is highly effective for diagnosing arrhythmias and malfunctions.
  • Diagnosis can be confirmed with pacemaker interrogation and often corrected through device adjustments.
  • This systematic approach significantly benefits patient care.