Related Experiment Video
Updated: May 1, 2026
09:20
Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
Published on: July 5, 2021
2.7K
Sinoatrial node electrical activity modulates pulmonary vein arrhythmogenesis
Yao-Chang Chen1, Yen-Yu Lu2, Chen-Chuan Cheng3
1Department of Biomedical Engineering, National Defense Medical Center, Taipei, Taiwan; Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung, Taiwan.
International Journal of Cardiology
|April 1, 2014
Summary
Sinoatrial node (SAN) electrical activity influences pulmonary vein (PV) arrhythmogenesis. SAN-PV conduction blocks can worsen PV arrhythmias, impacting atrial fibrillation (AF) development.
Area of Science:
- Cardiovascular Electrophysiology
- Cardiac Arrhythmias
Background:
- Sinoatrial node (SAN) dysfunction is linked to atrial fibrillation (AF).
- Pulmonary veins (PVs) are crucial in AF pathophysiology.
Purpose of the Study:
- To investigate if SAN electrical activity can modulate PV arrhythmogenesis.
Main Methods:
- Simultaneous recording of SAN and PV electrical activity using microelectrodes and a multi-electrode array system in rabbit models.
- Assessment of SAN-PV conduction properties with and without interruptions, before and after perfusion with ATX-II or isoproterenol.
Main Results:
- ATX-II increased PV beating rates, causing PV burst firing and SAN-PV conduction block in several preparations.
- After SAN-PV disconnection, ATX-II induced PV burst firing and afterdepolarizations.
- ATX-II reversed electrical conduction between SAN and PV, significantly increasing electrical activity.
Conclusions:
- SAN electrical activity plays a role in modulating PV arrhythmogenesis.
- Conduction blocks between the SAN and PV can exacerbate PV arrhythmogenesis.
More Related Videos
Related Concept Videos
01:20Conduction System of the Heart
6.1K
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.
This system relies on the unique properties of nodal and Purkinje cells:...
This system relies on the unique properties of nodal and Purkinje cells:...
6.1K
01:19Conduction System of the Heart
13.5K
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...
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...
13.5K
01:19Electrophysiology of Normal Cardiac Rhythm
7.8K
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...
7.8K
01:28Mechanism of Cardiac Arrhythmias
2.7K
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.
2.7K
01:13The Cardiac Cycle
77.5K
The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
The Process
Electrical signals—sent from the sinoatrial (SA) node in the right atrial wall to the atrioventricular (AV) node between the right atrium and right ventricle—cause both atria to simultaneously contract. When the signal reaches the AV node, it pauses for approximately a tenth of a second, allowing the atria to contract and...
The Process
Electrical signals—sent from the sinoatrial (SA) node in the right atrial wall to the atrioventricular (AV) node between the right atrium and right ventricle—cause both atria to simultaneously contract. When the signal reaches the AV node, it pauses for approximately a tenth of a second, allowing the atria to contract and...
77.5K
01:16ECG Interpretation of Arrhythmias I: Sinus Arrhythmias
1.2K
Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
1.2K