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相关概念视频

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

1.1K
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,...
1.1K
Conduction System of the Heart01:20

Conduction System of the Heart

5.1K
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:...
5.1K
Conduction System of the Heart01:19

Conduction System of the Heart

14.5K
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...
14.5K
Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

2.6K
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.
2.6K
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

868
Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
868
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

3.5K
Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
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相关实验视频

Updated: Mar 21, 2026

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
09:20

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice

Published on: July 5, 2021

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鼻节和心房节律失常

Roy M John1, Saurabh Kumar2

  • 1From Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA. rjohn2@partners.org.

Circulation
|May 12, 2016
PubMed
概括
此摘要是机器生成的。

节功能障碍 (SND) 和心房动 (AF) 通常是由于共享心房重塑而存在的. 对SND和AF的治疗取决于AF还是纤维化心肌病占主导地位.

关键词:
切除,导管心房动在心房停滞人工心脏起器有病鼻综合征鼻腔节点

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Whole-Mount Immunofluorescence Staining, Confocal Imaging and 3D Reconstruction of the Sinoatrial and Atrioventricular Node in the Mouse
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Whole-Mount Immunofluorescence Staining, Confocal Imaging and 3D Reconstruction of the Sinoatrial and Atrioventricular Node in the Mouse

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Isolation of Atrial Myocytes from Adult Mice
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Isolation of Atrial Myocytes from Adult Mice

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相关实验视频

Last Updated: Mar 21, 2026

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
09:20

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice

Published on: July 5, 2021

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Whole-Mount Immunofluorescence Staining, Confocal Imaging and 3D Reconstruction of the Sinoatrial and Atrioventricular Node in the Mouse
05:16

Whole-Mount Immunofluorescence Staining, Confocal Imaging and 3D Reconstruction of the Sinoatrial and Atrioventricular Node in the Mouse

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Isolation of Atrial Myocytes from Adult Mice
08:34

Isolation of Atrial Myocytes from Adult Mice

Published on: July 25, 2019

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科学领域:

  • 心脏病学
  • 电生理学
  • 前庭病理生理学

背景情况:

  • 节功能障碍 (SND) 和心房失常,特别是心房动 (AF),经常同时存在.
  • 连接SND和AF的确切机制仍然不完全理解.
  • 这两种情况都涉及心房肌肉结构和电力改造.

研究的目的:

  • 审查有关鼻节病理学的当前知识.
  • 阐明鼻病与心脏律乱之间的复杂关系.
  • 根据疾病表型制定量身定制的治疗策略.

主要方法:

  • 对SND和AF当代研究的文献综述.
  • 分析病理生理机制,包括遗传和结构因素.
  • 综合有关SND和AF联合治疗方法的信息.

主要成果:

  • SND可能是由AF的电力改造引起的,或者这两种情况都可能由渐进的心房结构改造引起.
  • 心房动通常与左心房触发器和基质有关.
  • 节功能障碍与结构变化有关,

结论:

  • 对SND和AF的治疗策略必须根据主要的表型进行个性化.
  • 导管切除有利于患有AF和二次性SND的患者.
  • 心脏节奏是患有主导性纤维性心肌病的患者的主要治疗方法.