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Related Concept Videos

Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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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...
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The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
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Electrical signals—sent from the sinoatrial (SA) node in the right atrial wall to the atrioventricular (AV) node between the right atrium and right ventricle—cause both atria to simultaneously contract. When the signal reaches the AV node, it pauses for approximately a tenth of a second, allowing the atria to contract and...
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Conduction System of the Heart01:19

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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.
The pacemaker cells are located in two primary nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node pacemaker cells can autonomously depolarize, triggering an action potential that leads to the...
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Imbalances in Cardiac Output01:26

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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ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

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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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Assessment of apical radial pulse01:25

Assessment of apical radial pulse

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Apical-Radial (A-R) Pulse Assessment
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Related Experiment Video

Updated: Oct 13, 2025

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

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

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[His bundle and left bundle branch pacing].

Carsten W Israel1

  • 1Klinik für Innere Medizin - Kardiologie, Diabetologie und Nephrologie, Evangelisches Klinikum Bethel, Burgsteig 13, 33617, Bielefeld, Deutschland. Carsten.Israel@evkb.de.

Herz
|November 12, 2021
PubMed
Summary
This summary is machine-generated.

Conduction system pacing, including His bundle pacing, effectively treats bradycardia and prevents pacemaker-induced cardiomyopathy. This advanced technique shows promise for improving heart function and patient outcomes.

Keywords:
Cardiac pacemakerCardiac resynchronization therapyConduction systemImplantation techniquesPacing-induced cardiomyopathy

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Devices

Background:

  • Conventional pacemakers treat bradycardia but can cause ventricular desynchronization and cardiomyopathy.
  • Conduction system pacing offers a potential solution to prevent or reverse this desynchronization.

Purpose of the Study:

  • To review the efficacy and indications of His bundle and left bundle branch pacing.
  • To highlight the benefits of conduction system pacing in specific patient populations.

Main Methods:

  • Review of existing data and studies on conduction system pacing.
  • Analysis of implantation techniques and success rates for His bundle and left bundle branch pacing.

Main Results:

  • His bundle and left bundle branch pacing achieve high success rates (up to 98%) with specialized techniques.
  • Conduction system pacing is recommended for specific cases, including difficult lead implantation and certain heart failure patients.

Conclusions:

  • Conduction system pacing is a valuable alternative to conventional pacing, especially for preventing cardiomyopathy.
  • Further randomized outcome studies are needed to solidify its role in European guidelines.