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Related Concept Videos

Conduction System of the Heart01:19

Conduction System of the Heart

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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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Conduction System of the Heart01:20

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The cardiac conduction system produces and transmits electrical impulses that prompt myocardial contraction, ensuring efficient heart function. This intricate system ensures that the heart beats in a coordinated and efficient manner, beginning with the atria and then the ventricles. The conduction system optimizes cardiac output by maintaining this precise sequence, which is crucial for adequate blood circulation.
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Pulse rhythm01:30

Pulse rhythm

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Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

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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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Electrophysiology of Normal Cardiac Rhythm01:19

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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...
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Dysrhythmias I: Introduction01:15

Dysrhythmias I: Introduction

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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...
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Related Experiment Video

Updated: Jan 3, 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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His bundle pacing: conduction system capture and clinical impact.

Vatsal Ladia1, Komandoor Srivathsan, Siva Mulpuru

  • 1Department of Cardiovascular Disease, Division of Cardiac Electrophysiology, Mayo Clinic, Phoenix, Arizona Department of Cardiovascular Disease, Division of Cardiac Electrophysiology, Mayo Clinic, Rochester, Minnesota, USA.

Current Opinion in Cardiology
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PubMed
Summary

His bundle pacing (HBP) is an emerging alternative for patients needing chronic ventricular pacing. Ongoing studies will soon provide evidence supporting native conduction system pacing for improved outcomes.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Devices

Background:

  • His bundle pacing (HBP) has been available for nearly two decades.
  • Recent inclusion in guidelines and ongoing research highlight its growing importance.

Purpose of the Study:

  • To review the impact of His bundle pacing on clinical practice.
  • To assess the current evidence and future directions for HBP.

Main Methods:

  • Review of published literature and randomized pilot studies.
  • Analysis of clinical outcomes and comparisons with other pacing techniques.

Main Results:

  • HBP is established as a feasible pacing alternative, included in clinical guidelines.
  • Studies compare selective and non-selective HBP, and HBP against cardiac resynchronization therapy.

Conclusions:

  • HBP is a valuable addition to cardiac resynchronization techniques.
  • Long-term outcomes in large populations with low ejection fraction require further investigation.
  • Future studies are expected to provide robust evidence for native conduction system pacing.