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Related Concept Videos

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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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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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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Regulation of Heart Rates01:31

Regulation of Heart Rates

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The regulation of heart rate is a complex process controlled by the autonomic nervous system (ANS), hormonal influences, and intrinsic cardiac mechanisms. The ANS has two main components: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS).
The SNS increases heart rate through the release of norepinephrine and epinephrine, which act on beta-1 adrenergic receptors in the heart. This action increases the rate of depolarization in the sinoatrial (SA) node, the heart's...
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Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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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.
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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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Related Experiment Video

Updated: Mar 8, 2026

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
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RNAs that make a heart beat.

Mithun Mitra1, Hilary A Coller1

  • 1Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, CA, USA;; Department of Biological Chemistry, David Geffen School of Medicine, Los Angeles, CA, USA.

Annals of Translational Medicine
|January 17, 2017
PubMed
Summary
This summary is machine-generated.

Stress-associated microRNAs like miR-223-3p increase after heart attack. Targeting miR-223-3p reduced arrhythmias in a rat model, suggesting potential new therapies for myocardial infarction.

Keywords:
Action potentialarrhythmiamicroRNAmyocardial infarctionpotassium channelvoltage-gated channel

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Area of Science:

  • Cardiovascular Biology
  • Molecular Cardiology
  • MicroRNA Therapeutics

Background:

  • Stress-associated microRNAs (miRNAs) are upregulated in the heart following myocardial infarction (MI).
  • Dysregulation of ion channels, particularly potassium channels, contributes to cardiac arrhythmias and heart disease.
  • MicroRNAs play crucial roles in regulating gene expression and cellular function in the cardiovascular system.

Purpose of the Study:

  • To investigate the role of the stress-associated microRNA, miR-223-3p, in regulating potassium channels after myocardial infarction.
  • To evaluate the therapeutic potential of targeting miR-223-3p for the reduction of cardiac arrhythmias post-MI.

Main Methods:

  • Induction of myocardial infarction in a rat model.
  • Assessment of stress-associated microRNA levels in cardiac tissue.
  • Investigation of miR-223-3p's effect on voltage-gated potassium channel components.
  • Administration of a small RNA antagonist against miR-223-3p in conjunction with MI induction.

Main Results:

  • Increased levels of stress-associated microRNAs, including miR-223-3p, were observed in the heart post-MI.
  • miR-223-3p was found to regulate a component of the potassium channel involved in action potential repolarization.
  • Administration of an anti-miR-223-3p molecule significantly reduced ventricular arrhythmias in rats following induced myocardial infarction.

Conclusions:

  • miR-223-3p is a key regulator of potassium channel function in the context of myocardial infarction.
  • Targeting miR-223-3p with small RNA antagonists demonstrates a promising therapeutic strategy for mitigating arrhythmias after heart attack.
  • Anti-miR-223-3p molecules represent a potential novel therapeutic approach for managing myocardial infarction complications.