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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.

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...

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...

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Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...

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Related Experiment Video

Updated: Jul 18, 2026

Recording Network Activity in Spinal Nociceptive Circuits Using Microelectrode Arrays

Recording Network Activity in Spinal Nociceptive Circuits Using Microelectrode Arrays

Published on: February 9, 2022

Abnormal atrial depolarization associated with Chiari network?

Laxman Prajapat¹, Vignendra Ariyarajah, David H Spodick

¹Department of Medicine, Saint Vincent Hospital, Worcester, Mass., USA.

|November 11, 2006

Summary

The Chiari network, a remnant in the right atrium, is linked to abnormal heart rhythms. This study highlights its electrocardiographic significance, particularly with prolonged P-wave duration, suggesting a predictor for atrial tachyarrhythmias.

Related Experiment Videos

Last Updated: Jul 18, 2026

Recording Network Activity in Spinal Nociceptive Circuits Using Microelectrode Arrays

Recording Network Activity in Spinal Nociceptive Circuits Using Microelectrode Arrays

Published on: February 9, 2022

Area of Science:

Cardiology
Electrophysiology
Congenital Heart Anomalies

Background:

The Chiari network is a congenital remnant of fetal membrane in the right atrium.
It is infrequently associated with complications like supraventricular tachyarrhythmias.
The basic electrocardiographic significance of the Chiari network remains largely unreported.

Observation:

This study presents three consecutive cases of the Chiari network.
All cases exhibited abnormal interatrial conduction, characterized by prolonged P-wave duration (>= 110 ms).

Findings:

The presence of a Chiari network was observed in conjunction with abnormal interatrial conduction.
Prolonged P-wave duration in these cases suggests a potential electrocardiographic marker associated with the Chiari network.

Implications:

The Chiari network may have direct electrocardiographic significance.
Abnormal interatrial conduction, indicated by prolonged P-wave duration, could be a predictor of atrial tachyarrhythmias in patients with a Chiari network.
Further research is warranted to explore the electrophysiological mechanisms and clinical relevance.