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Pathophysiology of Heart Failure

Pathophysiology of Heart Failure

Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...

Heart Failure I: Introduction

Heart Failure I: Introduction

Heart failure refers to a clinical syndrome caused by structural or functional cardiac disorders that prevent the heart from pumping an adequate amount of blood to meet the body's metabolic needs. This condition often arises from myocardial infarction or ischemia, leading to decreased cardiac output, reduced tissue perfusion, impaired gas exchange, fluid volume imbalance, and decreased functional ability.Heart failure can result from disruptions in the mechanisms that regulate cardiac output...

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...

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...

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.

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...

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Related Experiment Video

Updated: Sep 23, 2025

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 and Heart Failure.

Leonard Bergau^1,2, Philipp Bengel², Vanessa Sciacca¹

¹Clinic for Electrophysiology, Herz- und Diabeteszentrum Nordrhein-Westfalen, Ruhr Universität Bochum, 32545 Bad Oeynhausen, Germany.

Journal of Clinical Medicine

|May 14, 2022

Summary

Atrial fibrillation (AF) and heart failure (HF) are closely linked, with unclear causality. This review examines recent studies on managing AF in HF patients, focusing on rhythm versus rate control strategies.

Keywords:

atrial fibrillation catheter ablation heart failure remodeling

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Last Updated: Sep 23, 2025

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Area of Science:

Cardiology
Electrophysiology
Heart Failure Research

Background:

Atrial fibrillation (AF) is the most prevalent sustained arrhythmia globally, frequently co-occurring with heart failure (HF).
The etiological relationship between AF and HF is complex, with each potentially causing or resulting from the other.
Current standard care for AF patients with HF involves either rhythm control (restoring sinus rhythm) or rate control (slowing ventricular rate).

Purpose of the Study:

To review recent pivotal studies investigating therapeutic strategies for AF in patients with HF.
To elucidate the role of AF in the progression of left-ventricular dysfunction.
To discuss and compare optimal management strategies for comorbid AF and HF.

Main Methods:

Literature review of significant studies published within the last five years.
Analysis of research focusing on the impact of AF on left-ventricular function.
Synthesis of evidence comparing rhythm and rate control in HF patients with AF.

Main Results:

Recent studies offer new insights into the interplay between AF and left-ventricular dysfunction.
Evidence is accumulating regarding the efficacy of different therapeutic approaches in this complex patient group.
The optimal strategy for managing AF in HF patients remains an area of active investigation and evolving understanding.

Conclusions:

Understanding the bidirectional relationship between AF and HF is crucial for effective treatment.
Recent research provides valuable data for refining therapeutic decisions in AF patients with HF.
Further investigation is needed to definitively establish the superior management strategy for AF in the context of heart failure.