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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...

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,...

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.

Anatomy of the Heart

Anatomy of the Heart

The human heart is made up of three layers of tissue that are surrounded by the pericardium, a membrane that protects and confines the heart. The outermost layer, closest to the pericardium, is the epicardium. The pericardial cavity separates the pericardium from the epicardium. Beneath the epicardium is the myocardium, the middle layer, and the endocardium, the innermost layer. There are four chambers of the heart: the right atrium, the right ventricle, the left atrium, and the left ventricle.

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Updated: Jan 21, 2026

Viral Transgene Expression in Rodent Hearts and the Assessment of Cardiac Arrhythmia Risk

Viral Transgene Expression in Rodent Hearts and the Assessment of Cardiac Arrhythmia Risk

Published on: July 27, 2022

Ventricular Arrhythmias.

Soufian T AlMahameed¹, Ohad Ziv¹

¹Heart and Vascular Research Center, MetroHealth Campus of Case Western Reserve University, 2500 MetroHealth Medical Drive, Cleveland, OH 44109, USA.

The Medical Clinics of North America

|August 6, 2019

Summary

This summary is machine-generated.

Ventricular tachycardia (VT) can be benign or life-threatening. Prompt recognition and understanding VT mechanisms are crucial for effective clinical management and preventing sudden cardiac death.

Keywords:

Classification of ventricular arrhythmias Premature ventricular complexes Ventricular tachycardia

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Viral Transgene Expression in Rodent Hearts and the Assessment of Cardiac Arrhythmia Risk

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Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus

Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus

Published on: April 5, 2011

Area of Science:

Cardiology
Electrophysiology

Background:

Ventricular tachycardia (VT) is a common clinical finding.
VT poses a risk for sudden cardiac death.
Understanding VT mechanisms is key to treatment.

Purpose of the Study:

To review the classification of ventricular arrhythmias.
To discuss the mechanisms of ventricular arrhythmias.
To outline practical diagnosis and management strategies for VT.

Main Methods:

Literature review of current ventricular arrhythmia classifications.
Discussion of underlying electrophysiological mechanisms.
Presentation of clinical diagnosis and management scenarios.

Main Results:

Ventricular arrhythmias are classified based on various criteria.
Mechanisms include reentry, abnormal automaticity, and triggered activity.
Effective management hinges on accurate diagnosis and substrate understanding.

Conclusions:

Clinicians must be adept at recognizing and managing VT.
Tailored therapy based on VT substrate and mechanism improves outcomes.
Comprehensive understanding aids in preventing sudden cardiac death.