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相关概念视频

Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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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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Cardiopulmonary Resuscitation III: AED Use01:23

Cardiopulmonary Resuscitation III: AED Use

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Introduction to AEDAn Automated External Defibrillator (AED) is a portable medical device that analyzes the heart's rhythm and, if necessary, delivers an electrical shock to help the heart re-establish an effective rhythm during sudden cardiac arrest (SCA). SCA occurs when the heart suddenly and unexpectedly stops beating, leading to a loss of blood flow to the brain and other vital organs. In such emergencies, time is of the essence, and using an AED, combined with Cardiopulmonary...
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Dysrhythmias VI: Management of Dysrhythmias01:25

Dysrhythmias VI: Management of Dysrhythmias

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Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong the...
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Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

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Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per...
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ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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

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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...
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Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers01:12

Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers

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Class III antiarrhythmic drugs are a group of medications that can prolong action potentials in the heart. They achieve this by blocking potassium channels or enhancing inward currents from sodium channels. However, these drugs have a unique property of "reverse use-dependence," which is most pronounced at slower heart rates and can lead to torsades de pointes—a specific type of arrhythmia. However, it is essential to note that excessive QT interval prolongation—a measure of...
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相关实验视频

Updated: Mar 31, 2026

Advanced Cardiac Rhythm Management by Applying Optogenetic Multi-Site Photostimulation in Murine Hearts
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Advanced Cardiac Rhythm Management by Applying Optogenetic Multi-Site Photostimulation in Murine Hearts

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用三相波形进行心室除.

J Huang1, B H KenKnight, D L Rollins

  • 1Cardiac Rhythm Management Laboratory, Division of Cardiovascular Diseases, Department of Medicine, Department of Physiology, and Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL, USA.

Circulation
|March 22, 2000
PubMed
概括
此摘要是机器生成的。

三相除波形可能比二相波形更有效,特别是80%的倾斜和特定电极极性. 然而,它们的优势在所有配置和电容大小中并不一致.

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Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction
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A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation
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相关实验视频

Last Updated: Mar 31, 2026

Advanced Cardiac Rhythm Management by Applying Optogenetic Multi-Site Photostimulation in Murine Hearts
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Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction
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Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction

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A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation
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科学领域:

  • 心血管研究研究心血管研究
  • 生物医学工程 生物医学工程
  • 电力生理学 电力生理学

背景情况:

  • 假设三相波形会比二相波形少引起心肌损伤.
  • 这项研究研究了三相与两相波形的除门 (DFTs).

研究的目的:

  • 为了比较三相和两相波形的除功效.
  • 为了评估波形倾斜,相位持续时间和电极极性对DFT的影响.

主要方法:

  • 在使用透静系统的猪中确定了除动脉的值.
  • 测试了三相和两相波形,使用不同的电容大小 (300-microF和140-microF) 和倾斜.
  • 对于每个波形,对电极极性 (阳极和阴极) 对DFT的影响进行了评估.

主要成果:

  • 使用80%倾斜和特定电极极性的三相波形与使用300微F电容器的两相波形相比,显示出明显较低的DFT.
  • 在另一组中,49%和56%倾斜的三相波形显示出比类似倾斜的两相波形更低的能量需求,但仅用于阳极阶段1.
  • 在两组实验中,电极极性显著影响了三相波形的DFT.

结论:

  • 某些三相波形 (例如,80%的倾斜) 可以比使用300微F电容器的两相波形更有效地除.
  • 没有发现三相波形优于来自140微F电容器的两相波形.
  • 三相除的有效性取决于特定的相位持续时间和电极极性.