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Related Concept Videos

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

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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,...
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
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Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

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Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per...
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Dysrhythmias I: Introduction01:15

Dysrhythmias I: Introduction

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Dysrhythmias refers to abnormalities in the heart's rhythm. They result from disruptions in the heart's electrical conduction system, which includes the sinoatrial(SA)node, atrioventricular(AV) node, the bundle of His, bundle branches, and Purkinje fibers.Definition and PathophysiologyDysrhythmias result from disorders of impulse formation, impulse conduction, or both. The heart contains specialized cells in the sinoatrial node, atrioventricular node, and the bundle of His and Purkinje fibers...
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Conduction System of the Heart01:20

Conduction System of the Heart

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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:...
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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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Updated: Apr 29, 2026

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
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Relationship between two arrhythmias: sinus node dysfunction and atrial fibrillation.

Jun Zhao1, Tong Liu1, Guangping Li1

  • 1Department of Cardiology, Tianjin Institute of Cardiology, Second Hospital of Tianjin Medical University, Tianjin, People's Republic of China.

Archives of Medical Research
|May 15, 2014
PubMed
Summary
This summary is machine-generated.

Sinus node dysfunction (SND) and atrial fibrillation (AF) share links through structural remodeling and ion channel activity. Therapies targeting atrial fibrosis may offer novel treatment strategies for both conditions.

Keywords:
Atrial fibrillationRemodelingSinus node dysfunction

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Molecular Biology

Background:

  • Sinus node dysfunction (SND) and atrial fibrillation (AF) are common cardiac arrhythmias.
  • The relationship between SND and AF, particularly underlying mechanisms, requires further elucidation.

Purpose of the Study:

  • To review recent advancements in understanding the link between SND and AF.
  • To propose potential molecular and ionic mechanisms connecting these two conditions.

Main Methods:

  • Review of clinical and animal experimental data.
  • Analysis of structural and electrophysiological remodeling in the sinoatrial node (SAN) and atrium.
  • Investigation of molecular pathways including the renin-angiotensin system (RAS) and ion channels.

Main Results:

  • Structural and electrophysiological remodeling of the SAN and atrium are significantly related to both SND and AF.
  • Atrial remodeling is often associated with RAS activation; RAS inhibitors and statins show potential in preventing atrial fibrosis.
  • The funny current (If), Ca(2+) clock, and gap junctions (Cx40, Cx43, Cx45) in SAN and atrial tissue represent key links.
  • Common genetic mutations (e.g., emerin, SCN5A, HCN4) contribute to the correlation between SND and AF.

Conclusions:

  • SND and AF share common pathophysiological pathways involving atrial remodeling, ion channel function, and genetic factors.
  • Targeting atrial fibrosis with RAS inhibitors or statins may be a novel therapeutic strategy for both SND and AF.
  • Further research into molecular and ionic mechanisms can provide deeper insights into managing these arrhythmias.