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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 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 minute.

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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Related Experiment Video

Updated: Jul 25, 2026

Electrophysiological Assessment of Murine Atria with High-Resolution Optical Mapping

Electrophysiological Assessment of Murine Atria with High-Resolution Optical Mapping

Published on: February 22, 2018

Exploring postinfarction reentrant ventricular tachycardia with entrainment mapping

W G Stevenson¹, P L Friedman, P T Sager

¹Department of medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 12115, USA. WGSTEVENSO@BICS.BWH.HARVARD.EDU

Journal of the American College of Cardiology

|May 1, 1997

Summary

Pacing techniques help map complex reentry circuits causing ventricular tachycardia after heart attacks. This approach identifies critical isthmuses for effective radiofrequency ablation, improving patient outcomes.

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Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Published on: April 11, 2025

Area of Science:

Cardiology
Electrophysiology
Medical Devices

Background:

Ventricular tachycardia (VT) post-myocardial infarction (MI) often results from reentry circuits within the infarct zone.
These reentry circuits are frequently large and complex, posing challenges for electrophysiology study and catheter ablation.
Current mapping methods can be limited in defining the precise architecture of these circuits.

Purpose of the Study:

To introduce and evaluate a novel pacing approach for mapping reentry circuits in VT post-MI.
To demonstrate how pacing can help identify critical isthmuses within reentry circuits.
To assess the utility of a functional reentry circuit classification for predicting ablation success.

Main Methods:

Utilizing pacing stimuli delivered through mapping catheter electrodes to analyze tachycardia response.
Observing the effects of pacing at different sites relative to the reentry circuit.
Classifying reentry circuits into functional components based on pacing responses.

Main Results:

Pacing effectively identifies critical isthmuses, which are targets for radiofrequency catheter ablation.
The approach allows for mapping of reentry circuit components without needing to define the entire circuit.
A functional classification system aids in conceptualizing circuits and predicting ablation efficacy.

Conclusions:

Pacing via mapping catheter electrodes offers a valuable new method for studying VT reentry circuits post-MI.
This technique facilitates the identification of targets for successful radiofrequency catheter ablation.
Improved understanding and mapping of human reentry circuits are advancing VT management.