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Related Concept Videos

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.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...
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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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Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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Related Experiment Video

Updated: Jul 10, 2025

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Published on: April 11, 2025

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Emerging Technologies in Cardiac Pacing.

Ramya Vajapey1, Mina K Chung1

  • 1Department of Cardiovascular Medicine, Heart, Vascular & Thoracic Institute, Cleveland Clinic, Cleveland, Ohio, USA;

Annual Review of Medicine
|November 21, 2023
PubMed
Summary

Cardiac pacing has evolved beyond traditional methods to address heart failure caused by dyssynchrony. New techniques like His bundle and leadless pacing offer more physiologic solutions for bradyarrhythmia treatment.

Keywords:
His bundle pacingcardiac resynchronization therapyconduction system pacingleadless pacingleft bundle pacingpacemaker

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Last Updated: Jul 10, 2025

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Electrophysiology

Background:

  • Traditional right ventricular apical pacing can lead to heart failure due to electrical and mechanical dyssynchrony in pacemaker-dependent patients.
  • Physiologic pacing methods aim to mimic normal cardiac conduction and synchronize ventricular contraction.
  • Conventional biventricular pacing offers benefits for heart failure patients but can be limited by cardiac scarring.

Purpose of the Study:

  • To review the historical evolution of cardiac pacing techniques.
  • To explore novel and advanced pacing strategies.
  • To discuss alternatives to conventional pacing for improved patient outcomes.

Main Methods:

  • Review of existing literature on cardiac pacing evolution.
  • Analysis of novel pacing techniques including His bundle pacing and left bundle branch area pacing.
  • Exploration of leadless pacing as an alternative to transvenous systems.

Main Results:

  • Recognition of limitations in traditional pacing leading to development of advanced methods.
  • His bundle pacing and left bundle branch area pacing offer more physiologic ventricular activation.
  • Leadless pacing addresses limitations associated with conventional transvenous pacemaker systems.

Conclusions:

  • Cardiac pacing has significantly evolved to improve treatment of bradyarrhythmias.
  • Novel techniques like His bundle, left bundle branch area, and leadless pacing represent significant advances.
  • These newer strategies offer more synchronized and physiologic ventricular activation compared to traditional methods.