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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...

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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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...

Cardiac Action Potential

Cardiac Action Potential

Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials

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...

Mechanism of Cardiac Arrhythmias

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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.

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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Intermittent advanced atrial depolarization abnormality?

Vignendra Ariyarajah¹, Massud Ali, David H Spodick

¹Division of Cardiology, Department of Medicine, St. Boniface General Hospital, University of Manitoba, Winnipeg, Man., Canada. vignendra@hotmail.com

|October 16, 2007

Summary

This study reports the first observed case of advanced interatrial block (IAB) resolving to intermittent IAB. This finding challenges the notion that interatrial conduction delay only worsens over time.

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Area of Science:

Cardiology
Electrophysiology
Atrial Electrophysiology

Background:

Interatrial block (IAB) is characterized by abnormal atrial depolarization, with P waves ≥110 ms on electrocardiogram.
IAB can be partial or advanced, with advanced IAB indicating more severe interatrial conduction delay.
Advanced IAB is typically associated with progressive deterioration of atrial impulse propagation.

Observation:

Progression from partial to advanced IAB is documented.
The resolution of advanced IAB to a less severe form, specifically intermittent advanced IAB, has not been previously reported.
This report details the first observed instance of advanced IAB transitioning to intermittent IAB.

Findings:

The study presents the first known case of advanced interatrial block resolving to intermittent advanced interatrial block.
This observation suggests that interatrial conduction delay may not always be a progressive condition.
The findings indicate a potential for reversibility in advanced IAB.

Implications:

This case challenges the established understanding of interatrial conduction delay as a unidirectional process.
The resolution of advanced IAB suggests potential therapeutic targets for improving atrial conduction.
Further research is warranted to understand the mechanisms and clinical significance of advanced IAB resolution.