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Related Concept Videos

Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

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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...
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Pathophysiology of Heart Failure01:17

Pathophysiology of Heart Failure

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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...
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Heart Failure I: Introduction01:27

Heart Failure I: Introduction

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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...
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Heart Failure VI: Adjunct Therapies01:22

Heart Failure VI: Adjunct Therapies

278
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.
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Heart Failure Drugs: Diuretics01:22

Heart Failure Drugs: Diuretics

825
Heart failure and kidney perfusion are interconnected in a complex way. Reduced renal perfusion and venous congestion are two significant factors that contribute to renal dysfunction in heart failure. The kidneys, primarily responsible for fluid balance in the body, are adversely affected due to compromised cardiac output and increased venous pressure. In response to reduced renal perfusion, the kidneys activate neurohumoral mechanisms to restore balance. However, these mechanisms can be...
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Heart Failure V: Medical Management01:30

Heart Failure V: Medical Management

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Medical Management of Acute Decompensated Heart Failure (ADHF)The primary goals of therapy for patients hospitalized with acute decompensated heart failure (ADHF) include:Relieving symptomsOptimizing volume statusSupporting oxygenation and ventilationMaintaining cardiac output (CO) and end-organ perfusionIdentifying and addressing the cause of ADHFPreventing complicationsProviding patient education on factors precipitating HF exacerbationPlanning for dischargeOngoing monitoring and assessment...
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Author Spotlight: Investigating HR-Dependent Cardiac Function in Mouse Models Through a Novel Atrial-Pacing Approach
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Physiologic Pacing in Heart Failure.

Mihail G Chelu1,2,3, Jeanne E Poole4, Kenneth A Ellenbogen5

  • 1Section of Cardiology, Department of Medicine, Baylor College of Medicine, Houston.

The New England Journal of Medicine
|January 21, 2026
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Summary
This summary is machine-generated.

Cardiac resynchronization therapy (CRT) improves heart failure outcomes in eligible patients. Alternative pacing strategies like His bundle or left bundle branch pacing are emerging and under investigation for their efficacy compared to traditional biventricular pacing.

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Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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Area of Science:

  • Cardiology
  • Medical Devices
  • Electrophysiology

Background:

  • Cardiac physiologic pacing, or cardiac resynchronization therapy (CRT), is a treatment for heart failure patients with low ejection fraction and wide QRS complexes.
  • Traditional CRT involves biventricular pacing using a right ventricular lead and a coronary sinus lead.

Purpose of the Study:

  • To review the established benefits of biventricular pacing in heart failure.
  • To introduce alternative cardiac physiologic pacing strategies, including His bundle and left bundle branch pacing.
  • To highlight ongoing research comparing these new methods with traditional CRT.

Main Methods:

  • Review of randomized trials and recent studies on cardiac pacing in heart failure.
  • Analysis of clinical outcomes, exercise capacity, quality of life, and cardiac function (LVEF, ventricular volumes, mitral regurgitation).

Main Results:

  • Biventricular pacing has demonstrated significant clinical benefits in over 10,000 heart failure patients.
  • Benefits are most pronounced in patients with left bundle-branch block and QRS duration ≥150 msec.
  • Conduction system pacing (His bundle or left bundle branch) is emerging as a viable alternative.

Conclusions:

  • Biventricular pacing remains a cornerstone therapy for selected heart failure patients.
  • Conduction system pacing offers a promising alternative, with ongoing trials to establish its comparative effectiveness and safety.
  • Further research is crucial to define the optimal pacing strategy for individual patients.