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Related Concept Videos

Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

1.2K
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 heart...
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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...
160
Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

135
Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...
135
Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

113
Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per...
113
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

117
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...
117
Assumptions of Survival Analysis01:15

Assumptions of Survival Analysis

196
Survival models analyze the time until one or more events occur, such as death in biological organisms or failure in mechanical systems. These models are widely used across fields like medicine, biology, engineering, and public health to study time-to-event phenomena. To ensure accurate results, survival analysis relies on key assumptions and careful study design.
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Related Experiment Video

Updated: Sep 9, 2025

Catheter Ablation in Combination With Left Atrial Appendage Closure for Atrial Fibrillation
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Catheter Ablation in Combination With Left Atrial Appendage Closure for Atrial Fibrillation

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Relationship Between Time-to-First Atrial Tachyarrhythmia Recurrence and Atrial Fibrillation Burden: Implications for

Jason G Andrade1,2, Martin Aguilar1, Richard G Bennett2

  • 1Department of Medicine, Montreal Heart Institute, Université de Montréal, Canada (J.G.A., M.A., K.B., P.K., L.M.).

Circulation. Arrhythmia and Electrophysiology
|August 28, 2025
PubMed
Summary

Early atrial tachyarrhythmia recurrence after treatment for atrial fibrillation (AF) is linked to a higher long-term AF burden. Later recurrences indicate less clinical significance, highlighting the importance of timing in AF management.

Keywords:
atrial fibrillationatrial fluttercatheter ablationpulmonary veinstachycardia

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Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
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The WATCHMAN Left Atrial Appendage Closure Device for Atrial Fibrillation
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The WATCHMAN Left Atrial Appendage Closure Device for Atrial Fibrillation

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Statistics

Background:

  • Atrial tachyarrhythmia recurrence is a key outcome in atrial fibrillation (AF) treatment trials.
  • Understanding recurrence timing is crucial for evaluating AF interventions.

Purpose of the Study:

  • To investigate the association between the timing of the first atrial tachyarrhythmia recurrence and subsequent AF burden.
  • To analyze the clinical significance of recurrence timing in patients with paroxysmal AF.

Main Methods:

  • Patient-level data from two multicenter, prospective, randomized clinical trials were analyzed.
  • Continuous rhythm monitoring was used post-intervention, with patients stratified by the month of first recurrence after a 2-month blanking period.
  • AF burden was quantified as time spent in AF at 1 year and over 3 years of follow-up.

Main Results:

  • 56.5% of patients experienced their first recurrence within 3 months post-treatment; 79.5% by 6 months.
  • Earlier recurrence (month 3) was associated with significantly higher median AF burden (1.04%) compared to later recurrences (months 4-12: 0.13%; after month 12: 0.05%).
  • P-values < 0.0001 confirmed the statistical significance of these differences.

Conclusions:

  • The timing of atrial tachyarrhythmia recurrence after rhythm control for paroxysmal AF is variable.
  • Earlier recurrences correlate with increased long-term AF burden.
  • Later recurrences appear to have progressively diminished clinical significance.