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相关概念视频

Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

1.1K
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.
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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

174
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...
174
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

6.9K
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...
6.9K
Dysrhythmias I: Introduction01:15

Dysrhythmias I: Introduction

172
Dysrhythmias refers to abnormalities in the heart's rhythm. They result from disruptions in the heart's electrical conduction system, which includes the sinoatrial(SA)node, atrioventricular(AV) node, the bundle of His, bundle branches, and Purkinje fibers.Definition and PathophysiologyDysrhythmias result from disorders of impulse formation, impulse conduction, or both. The heart contains specialized cells in the sinoatrial node, atrioventricular node, and the bundle of His and Purkinje fibers...
172
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

884
Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin...
884
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

123
Dysrhythmias, also known as arrhythmias, are disturbances in the heart's rhythm that range from benign to life-threatening. A thorough evaluation is crucial for appropriate management and involves a comprehensive medical history, physical examination, and various diagnostic tests.Medical HistorySymptoms: Collect detailed information on palpitations, dizziness, syncope, chest pain, and fatigue. Note their onset, frequency, and triggers.Previous Cardiac Issues: Document any history of heart...
123

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相关实验视频

Updated: Sep 20, 2025

Patient-specific Modeling of the Heart: Estimation of Ventricular Fiber Orientations
12:09

Patient-specific Modeling of the Heart: Estimation of Ventricular Fiber Orientations

Published on: January 8, 2013

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无心脏起器家族的心房心室同步算法建模:虚拟患者分析.

Miguel A Leal1, Todd Sheldon2, Keelia Escalante2

  • 1Emory University School of Medicine, Atlanta, GA, USA. miguel.a.leal@emory.edu.

Cardiovascular engineering and technology
|May 27, 2025
PubMed
概括
此摘要是机器生成的。

在Micra AV2无心脏起器中,改进的算法显著改善了心房同步 (AVS) 并减少了编程时间. 这些进步为更高的心率提供了更好的节奏,并减少了临床负担.

关键词:
算法算法是一种算法.这是心房心室同步.无心脏起器是一种无心脏起器.建模建模模型是什么虚拟患者是虚拟的患者.

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Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing

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Translational Rabbit Model of Chronic Cardiac Pacing
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相关实验视频

Last Updated: Sep 20, 2025

Patient-specific Modeling of the Heart: Estimation of Ventricular Fiber Orientations
12:09

Patient-specific Modeling of the Heart: Estimation of Ventricular Fiber Orientations

Published on: January 8, 2013

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Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
12:45

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing

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Translational Rabbit Model of Chronic Cardiac Pacing
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Translational Rabbit Model of Chronic Cardiac Pacing

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科学领域:

  • 心脏病学 心脏病学
  • 生物医学工程 生物医学工程
  • 医疗器械 医疗器械

背景情况:

  • 无心脏起器提供了一个可替代的转静脉节拍系统.
  • 房同步 (AVS) 对于最佳的起器功能至关重要.
  • 迈克拉无心脏起器 (Micra AV) 是一款下一代设备.

研究的目的:

  • 评估Micra AV2无心脏起器中新型心房心房同步 (AVS) 算法的影响.
  • 用模拟来比较增强的AVS算法与原始算法的性能.
  • 评估对临床时间和编程负担的实际影响.

主要方法:

  • 利用AccelAV临床研究中的加速度计数据来创建虚拟患者.
  • 进行蒙特卡洛模拟,以比较增强的与原始的AVS算法.
  • 进行了现实世界调查,以量化减少AVS编程所带来的时间节省.

主要成果:

  • 在没有手动编程的90%患者中,Micra AV2中增强的心房传感设置在90%的患者中实现了>70%的AVS,而原始的Micra AV则为43%.
  • 麦克拉AV2自动+A3值算法显示,在每分钟80-100拍的范围内,门诊AVS (84.1%) 的改善.
  • 调查数据显示,由于提升了心房传感设置,每名患者平均设备检查时间减少了大约13分钟.

结论:

  • 模拟结果显示,使用Micra AV2.2,在高心率的情况下,自动AVS的显著改善.
  • 改进的算法增加了患者在没有临床干预的情况下达到>70%的AVS的比例.
  • 现实世界的数据证实了设备检查时间的缩短,表明临床负担较低.