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Related Concept Videos

Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase of...
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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...
Dysrhythmias I: Introduction01:15

Dysrhythmias I: Introduction

Dysrhythmias refers to abnormalities in the heart's rhythm. They result from disruptions in the heart's electrical conduction system, which includes the sinoatrial(SA)node, atrioventricular(AV) node, the bundle of His, bundle branches, and Purkinje fibers.Definition and PathophysiologyDysrhythmias result from disorders of impulse formation, impulse conduction, or both. The heart contains specialized cells in the sinoatrial node, atrioventricular node, and the bundle of His and Purkinje fibers...
Conduction System of the Heart01:19

Conduction System of the Heart

Autorhythmicity is a term that refers to the heart's inherent ability to generate electrical signals and instigate muscle contractions. This self-regulating conduction system within the heart consists of two key components: the pacemaker cells and specialized conducting cells.
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ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

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Related Experiment Video

Updated: Jun 18, 2026

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
12:45

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Published on: December 11, 2017

Electrical resynchronization induced by direct His-bundle pacing.

Daniel L Lustgarten1, Susan Calame, Eric M Crespo

  • 1Cardiovascular Research Institute, Burlington, Vermont, USA. daniel.lustgarten@vtmednet.org.

Heart Rhythm
|November 17, 2009
PubMed
Summary
This summary is machine-generated.

Direct His-bundle pacing (DHBP) offers a physiologic alternative for cardiac resynchronization therapy, successfully narrowing QRS duration in most patients. This method proved simpler and faster than traditional biventricular pacing (BiV).

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Devices

Background:

  • Biventricular pacing (BiV) for cardiac resynchronization therapy (CRT) presents technical challenges and a significant non-response rate (30-40%).
  • Direct His-bundle pacing (DHBP) is a potential alternative to address BiV limitations.
  • The consistency of QRS narrowing with DHBP requires further characterization.

Purpose of the Study:

  • To assess the feasibility of restoring His-Purkinje system functionality using DHBP.
  • To evaluate DHBP as a method for de novo cardiac resynchronization therapy.
  • To compare QRS duration between native conduction, DHBP, and BiV pacing.

Main Methods:

  • DHBP was temporarily implemented during de novo CRT implantation in 10 patients.
  • Comparison of QRS durations: native conduction, DHBP, and BiV pacing.
  • Assessment of DHBP lead implantation time versus standard left ventricular lead implantation.

Main Results:

  • Successful DHBP implementation in all 10 patients.
  • Significant QRS narrowing with DHBP compared to native conduction and BiV in 7/10 patients (171ms native vs. 148ms DHBP vs. 158ms BiV).
  • DHBP lead implantation time (16 min) was substantially shorter than BiV left ventricular lead implantation (42 min).

Conclusions:

  • DHBP is readily achievable in patients indicated for BiV CRT.
  • DHBP significantly narrows QRS duration in the majority of patients, indicating capture of latent His-Purkinje tissue.
  • DHBP presents a promising physiologic alternative to BiV for CRT, with improved procedural efficiency.