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Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

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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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Cardiac Catheterization III: Left Heart Catheterization01:24

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Left heart catheterization is an invasive diagnostic procedure used to evaluate the function and structure of the left side of the heart. It is generally performed to diagnose and treat cardiovascular conditions such as valve abnormalities, coronary artery disease, and congenital heart defects.Diagnostic and therapeutic purposesLeft heart catheterization serves various diagnostic and therapeutic purposes, including:Assessing coronary artery bypass grafts.Evaluating coronary artery disease in...
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Cardiac Catheterization IV: Nursing Management01:26

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Nursing responsibilities before cardiac catheterization include:Assess for allergies and establish baseline health status.Before cardiac catheterization, assess the patient for allergies to contrast dye. Perform a comprehensive baseline assessment, including vital signs, heart and breath sounds, and a neurovascular assessment of the extremities, noting distal pulses, skin color, and temperature. Instruct the patient to fast for 8-12 hours before the procedure. Evaluate baseline laboratory...
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Cardiac Action Potential01:30

Cardiac Action Potential

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Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials
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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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Related Experiment Video

Updated: Mar 14, 2026

Translational Rabbit Model of Chronic Cardiac Pacing
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Pacing Without Wires: Leadless Cardiac Pacing.

Michael L Bernard1

  • 1Department of Cardiology, Ochsner Clinic Foundation, New Orleans, LA.

Ochsner Journal
|September 24, 2016
PubMed
Summary

Leadless cardiac pacemakers (LCPs) offer a significant advancement in bradycardia therapy, showing favorable safety and efficacy compared to traditional pacemakers. Future leadless systems may enable multichamber pacing, transforming cardiac rhythm management.

Keywords:
Bradycardiacardiac pacing–artificialpacemaker–artificial

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Medical Devices

Background:

  • Over 700,000 pacemakers implanted globally each year, with over 250,000 in the U.S.
  • Traditional pacemakers use transvenous leads, a system unchanged for over 50 years.
  • Leadless pacing systems eliminate transvenous leads for bradyarrhythmia treatment.

Purpose of the Study:

  • To review leadless cardiac pacing (LCP) technologies.
  • To assess the efficacy and safety of current LCPs.
  • To discuss the future potential of leadless pacing.

Main Methods:

  • Discussion of two studied leadless cardiac pacemakers: Nanostim and Micra Transcatheter Pacing System.
  • Inclusion of one ultrasound-powered device: WiCS-LV.
  • Current LCPs are limited to single-chamber ventricular pacing; dual/multichamber leadless pacing is not yet studied.

Main Results:

  • Leadless cardiac pacemakers (LCPs) represent a major advancement in bradycardia therapy.
  • Initial studies indicate favorable efficacy and safety for Nanostim and Micra LCPs compared to transvenous pacemakers.

Conclusions:

  • LCPs demonstrate promising results, potentially transforming bradyarrhythmia treatment.
  • Pending FDA approval, these devices may usher in an era of leadless pacing.
  • Future developments aim for leadless single- and multichamber pacing solutions.