Related Experiment Video
Updated: Dec 23, 2025

06:40
Impact of Intracardiac Neurons on Cardiac Electrophysiology and Arrhythmogenesis in an Ex Vivo Langendorff System
Published on: May 22, 2018
11.1K
Atrio-ventricular junction: Can precision electrocardiology bridge cell and electrocardiogram?
Fabio Leonelli1, Roberto De Ponti2, Giuseppe Bagliani3
1James A Haley Veterans' Hospital, University of South Florida, Tampa, FL, United States of America.
Journal of Electrocardiology
|April 27, 2020
Summary
This review summarizes the Atrio Ventricular Junction
Area of Science:
- Cardiovascular Physiology
- Cardiac Electrophysiology
- Histology
Background:
- The Atrio Ventricular Junction (AVJ) is anatomically defined but its physiology remains incompletely understood.
- Existing research on AVJ histology, cellular electrophysiology, and intracellular connectivity requires synthesis.
- Understanding AVJ pathophysiology is crucial for interpreting electrocardiographic (ECG) findings.
Purpose of the Study:
- To provide an updated review of the histology, cellular electrophysiology, and intracellular connectivity of the Atrio Ventricular Junction (AVJ).
- To correlate current understanding of nodal pathophysiology with electrocardiographic (ECG) manifestations of AVN behavior.
- To introduce and advocate for "Precision Electrocardiology" by integrating cellular data with ECG analysis.
Main Methods:
- Comprehensive literature review of historical and recent findings.
- Synthesis of data on AVJ histology and cellular electrophysiology.
- Correlation of cellular mechanisms with ECG patterns.
Main Results:
- The review consolidates existing knowledge on AVJ structure and function.
- It highlights the link between nodal pathophysiology and ECG interpretations.
- "Precision Electrocardiology" is proposed as a more sensitive analytical approach.
Conclusions:
- A deeper understanding of AVJ physiology is achievable through integrated cellular and ECG analysis.
- "Precision Electrocardiology" offers enhanced diagnostic sensitivity compared to traditional ECG interpretation.
- Further research integrating cellular electrophysiology and clinical ECG data is warranted.
Related Concept Videos
Electrocardiogram Fundamentals
1.2K
Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin...
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin...
1.2K
Mechanism of Cardiac Arrhythmias
1.5K
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.
1.5K
Electrophysiology of Normal Cardiac Rhythm
8.5K
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...
8.5K
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias
353
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...
353
Correlation between ECG and Cardiac Cycle
11.2K
The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
11.2K
Cardiac Action Potential
5.2K
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
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
5.2K

