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Related Concept Videos

Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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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.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
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Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac 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 IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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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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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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Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

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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...
276
Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

348
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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Updated: Dec 1, 2025

Rat Model of Right-Sided Cardiac Remodeling and Arrhythmia Using Pulmonary Artery Banding
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Rat Model of Right-Sided Cardiac Remodeling and Arrhythmia Using Pulmonary Artery Banding

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Arrhythmias with Bystander Accessory Pathways.

Fabio M Leonelli1, Roberto De Ponti2, Giuseppe Bagliani3

  • 1Cardiology Department, James A. Haley Veterans' Hospital, 13000 Bruce B Down Boulevard, Tampa, FL 33612, USA; University of South Florida, 4202 East Fowler Avenue, Tampa, FL 33620, USA.

Cardiac Electrophysiology Clinics
|November 9, 2020
PubMed
Summary
This summary is machine-generated.

Accessory pathways (APs) can cause supraventricular tachycardia or preexcitation. Understanding their conduction properties is crucial for accurate diagnosis and effective patient management.

Keywords:
Accessory pathwayAntidromic tachycardiaAtrial fibrillationAtrial flutterAtrioventricular nodal reentryBystander accessory pathwayOrthodromic tachycardia

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Area of Science:

  • Cardiology
  • Electrophysiology

Background:

  • Accessory pathways (APs) are critical in understanding supraventricular tachycardias.
  • Their electrophysiological properties dictate clinical presentation and management strategies.

Purpose of the Study:

  • To elucidate the diagnostic significance of accessory pathway manifestations.
  • To highlight the importance of identifying AP conduction properties for patient care.

Main Methods:

  • Review of electrophysiological studies and clinical data related to accessory pathways.
  • Analysis of conduction patterns during sinus rhythm and tachycardia.

Main Results:

  • Accessory pathways can manifest during orthodromic supraventricular tachycardia or sinus rhythm preexcitation.
  • Conduction properties (antegrade, retrograde, or both) determine the AP's role in arrhythmias.
  • APs with only antegrade conduction act as bystanders during other arrhythmias.

Conclusions:

  • Accurate diagnosis of accessory pathway presence and function is essential.
  • Understanding AP conduction is vital for guiding immediate and long-term management strategies.