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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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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.
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Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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Dysrhythmias III: Characteristics of Dysrhythmias01:29

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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...
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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...
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

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Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
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Pathophysiology of Atypical Atrial Flutters.

Jacopo Marazzato1, Raffaella Marazzi2, Lorenzo Adriano Doni2

  • 1Department of Heart and Vessels, Ospedale di Circolo, Viale Borri, 57, Varese 21100, Italy; Department of Medicine and Surgery, University of Insubria, Viale Guicciardini, 9, Varese 21100, Italy.

Cardiac Electrophysiology Clinics
|September 24, 2022
PubMed
Summary

Atypical atrial flutters involve slow-conducting areas causing re-entrant circuits, even without heart disease. Three-dimensional mapping aids electrophysiologists in identifying critical ablation targets for these complex supraventricular arrhythmias.

Keywords:
Atypical atrial flutterCatheter ablationPhysiopathologySupraventricular tachycardia

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Arrhythmias

Background:

  • Atypical atrial flutters are complex supraventricular arrhythmias.
  • Re-entrant circuits involving slow-conducting areas are the primary arrhythmogenic substrate.
  • These arrhythmias can occur without underlying structural heart disease.

Purpose of the Study:

  • To outline ablation strategies for atypical atrial flutters.
  • To highlight the role of advanced mapping in understanding these arrhythmias.
  • To identify critical areas for effective catheter ablation.

Main Methods:

  • Utilizing three-dimensional mapping systems.
  • Analyzing electrophysiological complexity of re-entrant circuits.
  • Identifying critical isthmus sites for ablation.

Main Results:

  • Three-dimensional mapping is invaluable for understanding flutter circuits.
  • Critical areas amenable to ablation can be precisely identified.
  • Effective catheter ablation strategies can be developed.

Conclusions:

  • Three-dimensional mapping is essential for guiding ablation in atypical atrial flutters.
  • Understanding the electrophysiological substrate is key to successful treatment.
  • Catheter ablation offers an effective treatment option for these complex arrhythmias.