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相关概念视频

Disturbances in Heart Rhythm01:28

Disturbances in Heart Rhythm

918
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...
918
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

2.3K
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...
2.3K
Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers01:24

Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers

719
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...
719
Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers01:20

Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers

796
Class IV antiarrhythmic drugs, such as verapamil and diltiazem, block calcium channels. They primarily affect the heart, slowing the conduction in calcium-dependent tissues like the SA and AV nodes. These drugs manage reentrant supraventricular tachycardia (SVT) and reduce ventricular rate in atrial flutter/fibrillation.
Verapamil, a calcium channel blocker, inhibits calcium movement across myocardial cell membranes and vascular smooth muscle. This results in the dilation of coronary and...
796
Cardiac Action Potential01:30

Cardiac Action Potential

1.1K
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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相关实验视频

Updated: Jun 13, 2025

Non-fluoroscopic Catheter Tracking for Fluoroscopy Reduction in Interventional Electrophysiology
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从典型心房的偏好波面对绝缘反应的经验教训.

Linlin Wang1, Xiangwei Ding1,2, Weizhu Ju1

  • 1Division of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, China.

Journal of interventional cardiac electrophysiology : an international journal of arrhythmias and pacing
|September 12, 2024
PubMed
概括

在腔管位 (CTI) 切除过程中,针对偏好的波面 (PW) 更有效地终止典型的心房动 (AFL). 与传统方法相比,这种方法导致更快的双向导电块.

关键词:
剥离 剥离 剥离 剥离卡沃特里克斯皮德 (Cavotricuspid) 峡脉是其中的一个.首选导电方式 首选导电方式典型的心房动是心房动.

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Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation
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相关实验视频

Last Updated: Jun 13, 2025

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Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation
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High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation

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科学领域:

  • 电子生理学 电子生理学
  • 心脏节律失常的研究研究.
  • 导管切除技术 导管切除技术

背景情况:

  • 在典型的心房 (AFL) 中,穿过腔椎峡 (CTI) 的传导特性尚未完全理解.
  • 在CTI传导中的异质性可能会影响切除结果.

研究的目的:

  • 在典型的AFL中通过CTI调查优先传导通路.
  • 评估利用超高分辨率绘图对这些偏好的波线 (PW) 进行向的有效性.

主要方法:

  • 一项回顾性研究分析了28名AFL患者的波传播和切除反应.
  • 一项前性研究比较了23名AFL患者的PW导向废除与常规废除.
  • 使用超高分辨率绘图来识别PW并指导废弃策略.

主要成果:

  • 在回顾性分析中,确定了五种不同的波面传播模式.
  • 针对PW的废除导致了64.3%的回顾性病例和91.3%的前性病例的终止.
  • 与传统的除相比,PW引导的除在实现AFL终止和双向导电块方面要快得多.

结论:

  • 在CTI废除期间首先针对优惠波线是结束典型AFL的更有效的策略.
  • 这种有针对性的方法加快了实现双向导电阻的速度,这是AFL废除的关键终点.