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Related Concept Videos

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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Increased pulse rate01:17

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Tachycardia is a condition marked by an abnormally fast or irregular heart rate, surpassing the typical resting rate. In adults, tachycardia is characterized by a pulse rate ranging from 100 to 180 beats per minute. The increased heart rate can result in inadequate blood flow to various body parts, ultimately diminishing the oxygen supply to organs and tissues.
Many factors can elevate the risk of developing tachycardia. These include advanced age, a family history of arrhythmias, and an...
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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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In a cardiovascular examination, inspection and palpation are crucial for identifying abnormalities.
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Decreased pulse rate01:14

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Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
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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.
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Incessant Palpitations and Narrow Complex Tachycardia.

Frederick T Han1

  • 1Section of Cardiac Electrophysiology, Division of Cardiovascular Medicine, University of Utah Health Sciences Center, 30 North 1900 East, Room 4A-100 SOM, Salt Lake City, UT 84132, USA.

Cardiac Electrophysiology Clinics
|February 28, 2016
PubMed
Summary

Junctional tachycardia (JT), a rare supraventricular tachycardia, can be distinguished from AVNRT using premature atrial contractions. Successful ablation for JT requires precise activation mapping near the coronary sinus ostium.

Keywords:
AV dissociationJunctional tachycardiaSupraventricular tachycardia

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Area of Science:

  • Electrophysiology
  • Cardiology

Background:

  • Junctional tachycardia (JT) is an uncommon cause of supraventricular tachycardia.
  • Its intracardiac activation sequence closely resembles atrioventricular nodal reentrant tachycardia (AVNRT).

Observation:

  • Distinguishing JT from AVNRT can be challenging.
  • Premature atrial contractions can aid in differentiating these arrhythmias.
  • Slow pathway ablation, a common strategy for AVNRT, may not effectively terminate JT.

Findings:

  • Activation mapping during JT identified a specific low-amplitude potential.
  • This potential was located near the coronary sinus ostium and the inferior margin of the triangle of Koch.
  • Targeting this site with ablation successfully terminated the JT.

Implications:

  • Accurate diagnosis of JT is crucial for effective treatment.
  • Standard AVNRT ablation strategies may not be suitable for JT.
  • Advanced activation mapping techniques are vital for identifying optimal ablation targets in rare arrhythmias like JT.