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Related Concept Videos

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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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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ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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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...
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Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers

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Class IV antiarrhythmic drugs, such as verapamil and diltiazem, block calcium channels. They primarily affect the heart, slowing the conduction in calcium-dependent tissues like the SA and AV nodes. These drugs manage reentrant supraventricular tachycardia (SVT) and reduce ventricular rate in atrial flutter/fibrillation.
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Related Experiment Video

Updated: Dec 11, 2025

Primary Outcome Assessment in a Pig Model of Acute Myocardial Infarction
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Peri-infarction block, a marker for VT risk?

János Tomcsányi1, Béla Bózsik1, Hein Wellens2

  • 1Department of Cardiology, Buda Hospital of the Hospitaller Order of Saint John of God, Budapest, Hungary.

Journal of Electrocardiology
|August 20, 2020
PubMed
Summary
This summary is machine-generated.

This study identifies an ECG finding, acceleration-dependent peri-infarction block, as a potential marker for predicting ventricular tachycardia (VT) risk after myocardial infarction. This could help assess patients prone to post-infarction VT.

Keywords:
Peri-infarction blockReentryScarVentricular tachycardia

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Area of Science:

  • Cardiology
  • Electrophysiology

Background:

  • Monomorphic ventricular tachycardia (VT) is a serious complication following myocardial infarction (MI).
  • Assessing the risk of VT in post-MI patients remains crucial for preventative strategies.

Purpose of the Study:

  • To investigate the potential of an ECG finding, acceleration-dependent peri-infarction block, as a marker for post-infarction VT risk.
  • To re-evaluate a previously described but underutilized ECG entity.

Main Methods:

  • Case presentation of a patient with a history of MI and syncope.
  • ECG analysis revealing acceleration-dependent peri-infarction block.

Main Results:

  • The patient experienced monomorphic VT.
  • The ECG demonstrated an acceleration-dependent peri-infarction block in the inferior region.

Conclusions:

  • Acceleration-dependent peri-infarction block may serve as a valuable, albeit forgotten, ECG marker.
  • This ECG entity could aid in assessing the risk of ventricular tachycardia in patients post-myocardial infarction.