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Dysrhythmias III: Characteristics of Dysrhythmias

Dysrhythmias III: Characteristics of Dysrhythmias

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 minute.

Dysrhythmias II: Classification of Tachyarrhythmias

Dysrhythmias II: Classification of Tachyarrhythmias

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...

Dysrhythmias IV: Characteristics of Bradyarrhythmias

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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...

Disturbances in Heart Rhythm

Disturbances in Heart Rhythm

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...

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism, and...

Mechanism of Cardiac Arrhythmias

Mechanism of Cardiac Arrhythmias

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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Updated: May 22, 2026

Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine

Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine

Published on: February 17, 2018

Wide Complex Tachycardia: An Enigmatic Sequence.

Albert Roig¹, Alfonso Tolentino²

¹Department of Artificial Intelligence, EKGDX, Miami, Florida, USA.

JACC. Case Reports

|May 21, 2026

Summary

Long runs of wide QRS complexes in atrial fibrillation (AF) can mimic ventricular tachycardia (VT). This case highlights perpetuated Ashman-type aberrancy, emphasizing accurate diagnosis to prevent inappropriate therapies.

Keywords:

acute heart failure atrial fibrillation cardiomyopathy cardiovascular disease electrocardiogram electrophysiology myocardial infarction supraventricular arrhythmias tachycardia

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Last Updated: May 22, 2026

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Published on: December 22, 2023

Area of Science:

Cardiology
Electrophysiology

Background:

Differentiating ventricular tachycardia (VT) from aberrant conduction in atrial fibrillation (AF) is diagnostically challenging.
Aberrant conduction in AF can lead to misdiagnosis and inappropriate treatment.

Purpose of the Study:

To present a case of unusually long perpetuated Ashman-type aberrancy in AF.
To highlight the diagnostic challenge posed by wide-complex tachycardia mimicking VT in AF.

Main Methods:

Case report of a 64-year-old man with ischemic cardiomyopathy and AF presenting with decompensated heart failure.
Analysis of admission electrocardiogram showing wide-complex tachycardia with runs of aberrant QRS complexes.
Interpretation of perpetuated Ashman-type aberrancy attributed to concealed transseptal conduction.

Main Results:

The patient exhibited runs of up to 10 consecutive aberrant QRS complexes.
Perpetuated Ashman-type aberrancy was identified, mimicking nonsustained VT.
Abrupt normalization of QRS complexes suggested transient resolution of functional right bundle branch fatigue.

Conclusions:

Long runs of wide QRS complexes in AF may represent perpetuated aberrancy, not VT.
Accurate recognition of perpetuated aberrancy is crucial to avoid unnecessary and potentially harmful therapies.
This case underscores the importance of careful electrocardiographic analysis in AF management.