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Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

943
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.
943
Conduction System of the Heart01:19

Conduction System of the Heart

8.3K
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...
8.3K
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...
5.6K
Physiology of the Heart: The Cardiac Cycle01:18

Physiology of the Heart: The Cardiac Cycle

2.9K
The cardiac cycle describes the events from one heartbeat to the next. It includes three main phases: diastole, atrial systole, and ventricular systole, all driven by changes in chamber pressures and the function of heart valves.
Diastole: The Relaxation Phase
During diastole, all four heart chambers relax. The atrioventricular (AV) valves open, and the semilunar valves close. This phase sees the lowest chamber pressures, promoting ventricular filling. Venous blood enters the heart through the...
2.9K
The Cardiac Cycle01:13

The Cardiac Cycle

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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...
88.7K
Cardiac Action Potential01:30

Cardiac Action Potential

1.6K
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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Updated: Jul 15, 2025

Local Field Fluorescence Microscopy: Imaging Cellular Signals in Intact Hearts
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Local Field Fluorescence Microscopy: Imaging Cellular Signals in Intact Hearts

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心臓の細胞結合

Patrizia Camelliti, Daniel J Stuckey1

  • 1School of Biosciences, University of Surrey, Guildford, UK.

Science (New York, N.Y.)
|September 28, 2023
PubMed
まとめ
この要約は機械生成です。

心臓の傷痕組織にある線維芽細胞は 心臓細胞の異常な活動を引き起こし,マウスの心律失調を引き起こします. この発見は 繊維芽細胞を強調しています

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Voltage and Calcium Dual Channel Optical Mapping of Cultured HL-1 Atrial Myocyte Monolayer
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Local Field Fluorescence Microscopy: Imaging Cellular Signals in Intact Hearts
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Voltage and Calcium Dual Channel Optical Mapping of Cultured HL-1 Atrial Myocyte Monolayer
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科学分野:

  • 心血管生物学
  • 心臓の電気生理学
  • 繊維細胞生物学

背景:

  • 心臓損傷後の傷痕組織は 危険な心拍に繋がります
  • 傷痕組織内の特定の細胞の役割は完全に理解されていません.

研究 の 目的:

  • 心筋細胞 (ミオサイト) の電気活動に対する傷痕組織における線維芽細胞の直接的な影響を調査する.
  • 心筋線維芽細胞が心律乱の発生に 寄与するかどうかを判断する.

主な方法:

  • 心臓の損傷と傷跡のマウスモデルを使用しました.
  • 傷痕繊維芽細胞の存在で,筋細胞の電気生理学的記録を行いました.
  • フィブロブラストとミオサイトの相互作用を in situ と in vitro で分析した.

主要な成果:

  • 傷痕組織から分離された心臓線維芽細胞は 隣接する筋細胞に異常な興奮を引き起こした.
  • 傷痕線維芽細胞との共同培養は,発火活動と早期の脱極化ミオサイトの発生率を増加させた.
  • 傷痕組織における線維細胞の存在は,筋細胞の電気的不安定性の領域と相関する.

結論:

  • 心臓の傷痕組織内のフィブロブラストは,真髄細胞の電気的機能障害に積極的に貢献する.
  • これらの線維芽細胞は不律の発生を促進し,心臓発作後の心臓リズム障害の潜在的な治療標的として示唆されます.