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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...

Heart Failure II: Pathophysiology

Heart Failure II: Pathophysiology

Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...

Dysrhythmias III: Characteristics of Dysrhythmias

Dysrhythmias III: Characteristics of Dysrhythmias

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...

Heart Failure IV: Classification and Diagnostic Evaluation

Heart Failure IV: Classification and Diagnostic Evaluation

Heart failure can be classified in various ways, with the most common classifications based on physical activity limitations, disease progression, severity, and treatment strategies.The Functional Classification of Heart Failure divides patients into four categories based on physical activity limitation due to symptom burden.Class I: Patients in this class have cardiac disease but no physical activity limitations. Ordinary activities like walking, climbing stairs, or routine tasks do not cause...

Heart Failure VI: Adjunct Therapies

Heart Failure VI: Adjunct Therapies

Additional therapies for treating patients with heart failure (HF) may include procedural interventions, supplemental oxygen, the management of sleep disorders, and nutritional therapy.Procedural InterventionsImplantable Cardioverter-Defibrillator: For patients at risk of life-threatening arrhythmias due to severe left ventricular dysfunction, an Implantable Cardioverter-Defibrillator (ICD) can detect and terminate these arrhythmias, preventing sudden cardiac death and improving survival rates.

Imbalances in Cardiac Output

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The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send...

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Related Experiment Video

Updated: Mar 2, 2026

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

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

Published on: July 20, 2022

Atrial Fibrillation in Patients with Ischemic and Non-Ischemic Left Ventricular Dysfunction.

Robin Ducas¹, Vignendra Ariyarajah²

¹Section of Cardiology Dept. of Cardiac Sciences, University of Manitoba, Winnipeg, Manitoba, Canada.

Journal of Atrial Fibrillation

|May 13, 2017

Summary

Atrial fibrillation (AF) and left ventricular dysfunction (LVD) are common, worsening patient outcomes. Treatment for AF in LVD remains controversial despite numerous studies.

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Last Updated: Mar 2, 2026

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

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Published on: July 20, 2022

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The WATCHMAN Left Atrial Appendage Closure Device for Atrial Fibrillation

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Area of Science:

Cardiology
Clinical Medicine
Electrophysiology

Background:

Atrial fibrillation (AF) and left ventricular dysfunction (LVD) are prevalent cardiovascular conditions.
AF significantly worsens prognosis and clinical status in patients with LVD, regardless of etiology (ischemic or non-ischemic).

Purpose of the Study:

To review and analyze the current treatment strategies for atrial fibrillation in patients with left ventricular dysfunction.
To address the ongoing controversies and uncertainties in managing AF within the context of LVD.

Main Methods:

Literature review of clinical studies and trials.
Analysis of treatment options and their efficacy in managing AF in LVD patients.

Main Results:

Established link between AF and poor prognosis in LVD.
Identification of numerous studies addressing treatment, yet no consensus reached.

Conclusions:

Treatment for AF in the setting of LVD is complex and lacks definitive guidelines.
Further research is needed to establish optimal therapeutic approaches for this patient population.