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Related Concept Videos

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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Disturbances in Heart Rhythm01:29

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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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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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Mechanism of Cardiac Arrhythmias01:28

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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 II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

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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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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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Pseudoelectrical alternans during supraventricular tachycardia.

Hesham R Omar1, Enrico M Camporesi2

  • 1Internal Medicine Department, Mercy Medical Center, Clinton, Iowa, USA.

Turkish Journal of Emergency Medicine
|March 28, 2017
PubMed
Summary

This study reports a rare case of pseudoelectrical alternans during supraventricular tachycardia. This finding offers new insights into cardiac electrical activity during arrhythmias.

Keywords:
Pseudo-electrical alternansSupraventricular tachycardiaTamponade

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Arrhythmias

Background:

  • Pseudoelectrical alternans is a rare phenomenon characterized by alternating morphologies of the electrocardiogram (ECG) QRS complex.
  • Supraventricular tachycardia (SVT) is a group of rapid heart rhythms originating above the ventricles.
  • The association between pseudoelectrical alternans and SVT is not well-established.

Purpose of the Study:

  • To describe a unique case of pseudoelectrical alternans observed during an episode of supraventricular tachycardia.
  • To contribute to the understanding of the underlying mechanisms of pseudoelectrical alternans in the context of tachyarrhythmias.

Main Methods:

  • Case report detailing clinical presentation, electrocardiographic findings, and electrophysiological study results.
  • Analysis of the electrocardiogram (ECG) during supraventricular tachycardia to identify pseudoelectrical alternans.

Main Results:

  • Electrocardiographic evidence of pseudoelectrical alternans was observed during supraventricular tachycardia.
  • The specific characteristics of the pseudoelectrical alternans in this case are described.

Conclusions:

  • Pseudoelectrical alternans can occur during supraventricular tachycardia, highlighting a potential, albeit rare, manifestation of electrical alternans.
  • This case underscores the importance of careful electrocardiographic interpretation in patients with supraventricular tachycardia to recognize unusual phenomena.