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Related Concept Videos

Cardiomyopathy V: Interprofessional Care01:29

Cardiomyopathy V: Interprofessional Care

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Managing cardiomyopathy involves addressing underlying or precipitating causes, treating heart failure with medications, and implementing dietary changes and a balanced exercise and rest regimen.Lifestyle ModificationsCardiomyopathy patients should adopt a low-sodium diet to reduce fluid retention and manage heart failure. A personalized exercise and rest plan helps maintain physical fitness without overstraining the heart. Avoiding alcohol and tobacco is essential to prevent further damage to...
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Heart Failure VI: Adjunct Therapies01:22

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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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Cardiomyopathy II: Dilated Cardiomyopathy01:30

Cardiomyopathy II: Dilated Cardiomyopathy

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Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
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Dysrhythmias VI: Management of Dysrhythmias01:25

Dysrhythmias VI: Management of Dysrhythmias

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Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong the...
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Heart Failure Drugs: Inotropic Agents01:26

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Positive inotropic agents are commonly used as the first line of treatment for heart failure. One such agent is digoxin, derived from the genus Digitalis, which has been known for centuries but effectively utilized since 1785. However, these cardiac glycosides can have potentially toxic effects due to their mechanism of action, which involves inhibiting Na+/K+-ATPase and increasing contractility. Digoxin is absorbed orally and distributed in various tissues, including the CNS. It has a long...
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Cardiopulmonary Resuscitation III: AED Use01:23

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Introduction to AEDAn Automated External Defibrillator (AED) is a portable medical device that analyzes the heart's rhythm and, if necessary, delivers an electrical shock to help the heart re-establish an effective rhythm during sudden cardiac arrest (SCA). SCA occurs when the heart suddenly and unexpectedly stops beating, leading to a loss of blood flow to the brain and other vital organs. In such emergencies, time is of the essence, and using an AED, combined with Cardiopulmonary...
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Updated: Apr 5, 2026

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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Cardiac resynchronization therapy update: evolving indications, expanding benefit?

C Butcher1, Y Mareev, V Markides

  • 1Royal Brompton and Harefield NHS Foundation Trust, London, UK.

Current Cardiology Reports
|August 24, 2015
PubMed
Summary
This summary is machine-generated.

Cardiac resynchronization therapy (CRT) benefits heart failure patients, but its exact mechanisms remain unclear. New strategies aim to enhance CRT effectiveness and expand its use in heart failure management.

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Area of Science:

  • Cardiology
  • Medical Devices
  • Heart Failure Research

Background:

  • Cardiac resynchronization therapy (CRT) is established for heart failure but its precise mechanisms of action are not fully understood.
  • Current evidence suggests left ventricular dyssynchrony may not be the primary driver of CRT benefits.
  • Alternative mechanisms like atrio-ventricular resynchronization and mitral regurgitation reduction are being explored.

Purpose of the Study:

  • To explore the uncertain mechanisms underlying the effectiveness of cardiac resynchronization therapy (CRT).
  • To identify reliable predictors of CRT benefit beyond QRS duration.
  • To review emerging technologies and future directions for improving CRT.

Main Methods:

  • Review of recent data and clinical observations regarding CRT efficacy.
  • Analysis of potential mechanisms of benefit including electrical and mechanical factors.
  • Evaluation of current and novel technological advancements in CRT.

Main Results:

  • The benefits of CRT may stem from mechanisms other than solely left ventricular dyssynchrony correction.
  • Atrio-ventricular resynchronization, mitral regurgitation reduction, and bradycardia prevention are potential contributors to CRT's effectiveness.
  • A QRS duration exceeding 140 ms is the most consistent clinical predictor of CRT benefit.
  • Numerous innovative approaches are under development to optimize CRT outcomes.

Conclusions:

  • The multifaceted nature of CRT benefits suggests that no single metric can accurately predict patient response.
  • Ongoing research and technological advancements are crucial for refining CRT and broadening its application in heart failure.
  • Further evidence is required to determine CRT's efficacy in patients with atrial fibrillation and the added value of defibrillator functionality.