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Related Concept Videos

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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Electrocardiogram01:29

Electrocardiogram

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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 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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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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Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

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Dysrhythmias, also known as arrhythmias, are disturbances in the heart's rhythm that range from benign to life-threatening. A thorough evaluation is crucial for appropriate management and involves a comprehensive medical history, physical examination, and various diagnostic tests.Medical HistorySymptoms: Collect detailed information on palpitations, dizziness, syncope, chest pain, and fatigue. Note their onset, frequency, and triggers.Previous Cardiac Issues: Document any history of heart...
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Related Experiment Video

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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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Algorithms to Identify Accessory Pathways' Location on the 12-Lead Electrocardiogram.

Derek Crinion1, Adrian Baranchuk1

  • 1Division of Cardiology, Queen's University, Kingston Health Sciences Centre, Kingston General Hospital Site, Kidd 3, 76 Stuart Street, Kingston, Ontario K7L 2V7, Canada.

Cardiac Electrophysiology Clinics
|November 9, 2020
PubMed
Summary

Estimating accessory pathway (AP) position aids pre-procedure planning and risk assessment. This review details AP localization algorithms, tracing their evolution from surgical to contemporary electroanatomic mapping techniques.

Keywords:
AblationAccessory pathwayLocalizationPreexcitationWolff-Parkinson-White syndrome

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Area of Science:

  • Electrophysiology
  • Cardiac Anatomy
  • Medical Device Technology

Background:

  • Accurate accessory pathway (AP) localization is crucial for effective pre-procedural planning in cardiac electrophysiology.
  • Estimating AP position enhances procedural efficiency, reduces mapping duration, and refines risk stratification for patient consent.
  • Understanding the evolution of AP localization algorithms provides critical insights into invasive treatment strategies.

Purpose of the Study:

  • To outline the nomenclature and core concepts of accessory pathway localization algorithms.
  • To provide an overview of three prominent AP localization algorithms, representing distinct eras of invasive treatment.
  • To illustrate the evolution, premises, and potential pitfalls of AP localization techniques for interventional electrophysiologists.

Main Methods:

  • Review and synthesis of historical and contemporary accessory pathway localization algorithms.
  • Categorization of algorithms based on treatment eras: surgical therapy, endocardial ablation, and electroanatomic mapping.
  • Distillation of key features into a simplified topographic algorithm for practical clinical application.

Main Results:

  • Nomenclature and fundamental concepts of AP localization algorithms are presented.
  • Three distinct algorithms representing surgical, endocardial ablation, and electroanatomic mapping eras are detailed.
  • The evolution, strengths, and limitations of these algorithms are elucidated.

Conclusions:

  • Accessory pathway localization algorithms have evolved significantly, improving pre-procedural planning and patient care.
  • A simplified topographic algorithm is proposed to aid interventional electrophysiologists in practical AP localization.
  • Continued refinement of localization techniques is essential for optimizing invasive cardiac procedures.