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Related Concept Videos

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.
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Conduction System of the Heart01:19

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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.
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Electrophysiology of Normal Cardiac Rhythm01:19

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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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Mechanism of Cardiac Arrhythmias01:28

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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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The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
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The development of the human heart, a crucial organ, commences from the mesoderm on the 18th or 19th day after fertilization. This process initiates in the cardiogenic area, a group of mesodermal cells at the embryo's head end, which evolves into elongated strands known as cardiogenic cords. These cords undergo a transformation to form hollow-centered endocardial tubes.
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Updated: Dec 24, 2025

Generation of Murine Cardiac Pacemaker Cell Aggregates Based on ES-Cell-Programming in Combination with Myh6-Promoter-Selection
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Transcriptional Patterning of the Ventricular Cardiac Conduction System.

Ozanna Burnicka-Turek1,2,3, Michael T Broman4, Jeffrey D Steimle1,2,3

  • 1From the Department of Pediatrics (O.B.-T., J.D.S., K.I., R.D.N., D.E.A., X.H.Y., I.P.M.), University of Chicago, Chicago, IL.

Circulation Research
|April 16, 2020
PubMed
Summary

The balance of T-box factors Tbx5 and Tbx3 patterns the cardiac conduction system. Disrupting this balance in the ventricular conduction system (VCS) can lead to nodal-like cells and lethal arrhythmias.

Keywords:
His bundle/atrioventricular bundleTbx3Tbx5arrhythmiacardiac conduction systemheart rhythmventricular conduction

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Area of Science:

  • Cardiovascular Physiology
  • Molecular Biology
  • Genetics

Background:

  • The heartbeat relies on the cardiac conduction system (CCS), a network of cardiomyocytes.
  • Proper patterning of the CCS into distinct nodal and ventricular conduction system (VCS) components is crucial for normal heart rhythm.
  • The molecular mechanisms driving this regional specialization remain poorly understood.

Purpose of the Study:

  • To elucidate the genetic and genomic underpinnings of VCS and nodal cell distinction.
  • To investigate the impact of disrupted VCS patterning on cardiac rhythm.

Main Methods:

  • Utilized mouse genetics to study T-box factor roles (Tbx5 and Tbx3) in VCS development.
  • Performed gene expression profiling and electrophysiological analyses.
  • Investigated in vivo consequences of Tbx5 disruption.

Main Results:

  • The balance between Tbx5 and Tbx3 dictates VCS myocyte identity and function.
  • Loss of Tbx5 or gain of Tbx3 in adult VCS cells resulted in nodal-like characteristics.
  • Tbx5 directly activates genes essential for fast VCS conduction, defining VCS identity.
  • Tbx5 deficiency in vivo caused arrhythmias and lethal ventricular events.

Conclusions:

  • The cardiac conduction system defaults to a slow, nodal state, with a T-box-driven fast conduction network specifically in the VCS.
  • Disruption of the VCS gene regulatory network permits the emergence of nodal physiology.
  • This provides a molecular basis for certain lethal ventricular arrhythmias.