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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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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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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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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...
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Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

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The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
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Related Experiment Video

Updated: Apr 12, 2026

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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Arrhythmias in left ventricular noncompaction.

Christina Y Miyake1, Jeffrey J Kim1

  • 1Section of Pediatric Cardiology, Department of Pediatrics, Baylor College of Medicine, Texas Children's Hospital, 6621 Fannin Street, Houston, TX 77030, USA.

Cardiac Electrophysiology Clinics
|May 24, 2015
PubMed
Summary
This summary is machine-generated.

Left ventricular noncompaction (LVNC) is a heart muscle disorder linked to heart failure and sudden death. Managing its associated arrhythmias is crucial for patient outcomes and preventing fatal events.

Keywords:
ArrhythmiasAtrial fibrillationCardiomyopathyElectrocardiogramHeart failureLeft ventricular noncompactionSudden deathVentricular tachycardia

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Area of Science:

  • Cardiology
  • Genetics
  • Pathology

Background:

  • Left ventricular noncompaction (LVNC) is an emerging cardiomyopathy.
  • It is characterized by abnormal heart muscle development.
  • LVNC is associated with significant risks including heart failure, arrhythmias, and thromboembolic events.

Purpose of the Study:

  • To review the clinical significance of arrhythmias in LVNC.
  • To discuss the prognostic implications of these arrhythmias.
  • To outline current management strategies for arrhythmias in LVNC patients.

Main Methods:

  • Literature review of studies on LVNC and arrhythmias.
  • Analysis of clinical data associating arrhythmias with outcomes.
  • Synthesis of evidence regarding therapeutic interventions.

Main Results:

  • Arrhythmias, both ventricular and supraventricular, are common in LVNC.
  • The presence and type of arrhythmias correlate with prognosis and adverse outcomes.
  • Sudden death risk is elevated, particularly with ventricular dilation and systolic dysfunction.

Conclusions:

  • Arrhythmias are a key clinical feature of LVNC across all age groups.
  • Effective management of arrhythmias is essential for improving patient care and prognosis.
  • Therapeutic options include antiarrhythmic drugs, ablation, and implantable cardioverter-defibrillators.