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Conduction System of the Heart

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.
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...

Pulse rhythm

Pulse rhythm

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...

Electrophysiology of Normal Cardiac Rhythm

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...

Disturbances in Heart Rhythm

Disturbances in Heart Rhythm

Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow...

Mechanism of Cardiac Arrhythmias

Mechanism of Cardiac Arrhythmias

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.

Cardiac Action Potential

Cardiac Action Potential

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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Updated: May 15, 2025

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

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

Published on: December 11, 2017

Cardiac Resynchronization Therapy and Conduction System Pacing.

Thomas Garvey O'Neill¹, Takahiro Tsushima², Bhupendar Tayal³

¹Department of Medicine, University Hospitals Cleveland Medical Center, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA.

Journal of Clinical Medicine

|May 14, 2025

Summary

This summary is machine-generated.

Left bundle branch block (LBBB) is a significant cause of heart failure (HF). This review explores traditional cardiac resynchronization therapy (CRT) and newer cardiac conduction system pacing (CSP) for LBBB-related HF.

Keywords:

cardiac resynchronization therapy conduction system pacing left bundle branch block

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

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Published on: February 17, 2018

Area of Science:

Cardiology
Electrophysiology
Heart Failure Research

Background:

Left bundle branch block (LBBB) is increasingly linked to advanced heart failure (HF).
Traditional cardiac resynchronization therapy (CRT) offers benefits but is ineffective in about one-third of patients.
Cardiac conduction system pacing (CSP) is emerging as a novel alternative for LBBB-related HF.

Purpose of the Study:

To review the diagnostic criteria for LBBB.
To examine the relationship between LBBB and the development of HF.
To compare the efficacy of traditional CRT and CSP for treating LBBB-induced HF.

Main Methods:

Literature review of diagnostic criteria for LBBB.
Analysis of studies on LBBB and HF progression.
In-depth review of clinical data for transvenous CRT and CSP.

Main Results:

LBBB is a key factor in HF development.
CRT is a standard therapy but has limitations.
CSP shows promise as an alternative pacing strategy.

Conclusions:

Understanding LBBB diagnostic criteria is crucial for HF management.
CSP represents a significant advancement in pacing for LBBB patients.
Further research is needed to fully elucidate CSP's role in HF.