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

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

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...

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.

Disturbances in Heart Rhythm

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

Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu

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Genetic variations significantly influence drug response through pharmacokinetics, receptor interactions, and biologic milieu modifications. Pharmacokinetic alterations impact drug metabolism and clearance, affecting efficacy and toxicity. Variants in drug-metabolizing enzymes, such as CYP2C9 and CYP2C19, alter drug activation and elimination. For example, CYP2C9 loss-of-function variants require lower warfarin doses to prevent excessive bleeding, while CYP2C19 variants reduce clopidogrel...

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.

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Related Experiment Video

Updated: May 11, 2026

Catheter Ablation in Combination With Left Atrial Appendage Closure for Atrial Fibrillation

Catheter Ablation in Combination With Left Atrial Appendage Closure for Atrial Fibrillation

Published on: February 26, 2013

[Atrial fibrillation and genetic abnormalities].

Wataru Shimizu¹

¹Department of Cardiovascular Medicine, National Cerebral and Cardiovascular Center.

Nihon Rinsho. Japanese Journal of Clinical Medicine

|May 2, 2013

Summary

Genetic factors significantly contribute to atrial fibrillation (AF) pathogenesis. This review explores genetic links in both familial and non-familial AF, including inherited conditions and GWAS findings.

Area of Science:

Cardiology
Genetics
Molecular Biology

Context:

Atrial fibrillation (AF) is a prevalent cardiac arrhythmia, particularly in older populations.
Genetic factors are increasingly recognized as crucial in AF development.
Understanding genetic underpinnings is vital for personalized medicine approaches.

Purpose:

To review the genetic basis of atrial fibrillation.
To categorize and discuss different genetic patterns associated with AF.
To highlight recent advancements from genome-wide association studies (GWAS).

Summary:

Familial AF can arise from monogenic disorders or as part of other inherited cardiac conditions and arrhythmic syndromes.
Non-familial AF may be influenced by genetic predispositions, such as ACE gene polymorphisms.

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Electrophysiological Assessment of Murine Atria with High-Resolution Optical Mapping

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Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation

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Electrophysiological Assessment of Murine Atria with High-Resolution Optical Mapping

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Published on: February 22, 2018

GWAS have identified numerous genomic regions linked to AF susceptibility.

Impact:

Provides a comprehensive overview of AF genetic etiology.
Informs future research directions in AF genetics and treatment.
Aids in identifying individuals at higher genetic risk for AF.