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相关概念视频

Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

8.7K
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...
8.7K
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,...
724
Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

1.6K
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.
1.6K
Conduction System of the Heart01:19

Conduction System of the Heart

12.4K
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...
12.4K
Conduction System of the Heart01:20

Conduction System of the Heart

3.3K
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:...
3.3K
Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers01:24

Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers

1.4K
Adrenergic stimulation generally impacts cardiac rate and rhythm. Specifically, stimulation of the β-adrenoceptors triggers an increase in intracellular calcium ion influx and pacemaker currents, which may cause arrhythmias. Catecholamines like adrenaline also demonstrate β2-adrenoceptor-mediated hypokalemia, impacting cardiac action potential and disrupting the normal cardiac rhythm. Class II antiarrhythmic drugs are β-adrenoceptor antagonists or β-blockers, which...
1.4K

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Generation of Murine Cardiac Pacemaker Cell Aggregates Based on ES-Cell-Programming in Combination with Myh6-Promoter-Selection
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Generation of Murine Cardiac Pacemaker Cell Aggregates Based on ES-Cell-Programming in Combination with Myh6-Promoter-Selection

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心脏起器细胞状态的PITX2剂量依赖性变化是鼻节功能障碍和心房失律的基础.

Lieve E van der Maarel1, M Ridwane Mungroo1, Otto J Mulleners1

  • 1Department of Medical Biology, Amsterdam Cardiovascular Sciences, Amsterdam Reproduction and Development, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, the Netherlands.

Nature communications
|December 5, 2025
PubMed
概括

基因组删除会增加PITX2基因表达,导致心律障碍. 这项研究将PITX2剂量与小鼠和人类细胞中的心脏起器细胞身份丧失和心房失常症联系起来.

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Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
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Methods for the Isolation, Culture, and Functional Characterization of Sinoatrial Node Myocytes from Adult Mice
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Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
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Methods for the Isolation, Culture, and Functional Characterization of Sinoatrial Node Myocytes from Adult Mice
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科学领域:

  • 心血管生物学 心血管生物学
  • 发展生物学 发展生物学
  • 遗传学 遗传学 是一个

背景情况:

  • 在发育和疾病中,转录因子剂量的生理相关增加尚未得到充分研究.
  • 对PITX2基因组转录因子基因 (PITX2) 的基因组删除与鼻节功能障碍和心房动有关.

研究的目的:

  • 为了研究增加PITX2表达在鼻节发育和功能中的作用.
  • 建立基因变异,PITX2剂量和心律失常之间的机制联系.

主要方法:

  • 使用了一种小鼠模型 (delB),基因组删除影响了PITX2表达.
  • 在delB小鼠中分析了胚胎鼻结的发育和心肌细胞的身份.
  • 在人类诱导的多能干细胞干细胞衍生的心脏起器心肌细胞中检查了宫外PITX2c表达.

主要成果:

  • 在delB小鼠胚胎鼻节点中异卵性PITX2表达在生理剂量下以异质的模式发生.
  • 在delB鼻节内的离散子域显示了PITX2对心脏起器心肌细胞身份的剂量依赖性损失.
  • 鼻节功能障碍的严重程度和心房失常敏感性与PITX2剂量相关.
  • 人体细胞中的异位PITX2c模仿了delB小鼠的发现,显示了剂量依赖的转录和电生理变化.

结论:

  • 转录因子剂量,特别是PITX2的空间时间定义的增加,可以导致心脏发育缺陷.
  • 影响PITX2剂量的遗传变异提供了与鼻节功能障碍和心房节律失调的机械联系.
  • 这项研究强调了转录因子剂量对心脏发育和疾病倾向的重要性.