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相关概念视频

Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

2.1K
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...
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Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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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.
886
Disturbances in Heart Rhythm01:28

Disturbances in Heart Rhythm

898
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...
898
Pathophysiology of Heart Failure01:17

Pathophysiology of Heart Failure

1.5K
Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...
1.5K
Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

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Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
542
Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

1.3K
The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send...
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相关实验视频

Updated: Jun 4, 2025

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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空间心室梯度与节奏诱导的心肌病相关.

Mohamad Raad1, Daniel B Kramer2, Hans F Stabenau3

  • 1Cardiovascular Division, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.

Heart rhythm
|December 30, 2024
PubMed
概括

空间心室梯度 (SVG) 预测了节奏诱导心肌病 (PICM). 这种矢量心脏学标记可以识别高风险患者,为早期节奏策略提供信息,以预防心脏功能障碍.

关键词:
起器是一种心脏起器.节奏调节诱导的心肌病变.右心室的节奏节奏.风险预测风险预测空间心室梯度梯度的空间.

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Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine
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相关实验视频

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科学领域:

  • 心脏病学 心脏病学
  • 电力生理学 电力生理学
  • 医疗器械 医疗器械

背景情况:

  • 节奏诱导心肌病 (PICM) 是右心室节奏的一个常见并发症.
  • 需要PICM的预测方法来指导初始节奏策略和监测.
  • 对于PICM,经常需要对双心室或导电系统节奏进行重新操作.

研究的目的:

  • 研究空间心室梯度 (SVG) 与PICM发展之间的关联.
  • 确定电气和机械异质性的标记SVG是否可以预测PICM.
  • 评估SVG作为一种潜在的生物标志物,用于识别患有PICM风险的患者.

主要方法:

  • 在2003年至2012年期间接受心脏起器的203名患者的回顾性研究.
  • 基线人口学,心声学和心电学参数的分析,包括SVG.
  • 使用调整后的考克斯比例危险建模来评估SVG与PICM风险的关联.

主要成果:

  • 在随访期间,22%的患者出现PICM.
  • 未经调整的分析显示男性性别,QRS持续时间和SVG近视线预测了PICM.
  • 调整后的分析显示,在植入前和植入后,平均调整后的SVG向水平较高,显著预测了PICM.

结论:

  • 在心脏起器植入前后进行空间心室梯度评估,可以确定患有PICM风险较高的患者.
  • SVG可能有助于选择可以从初始双心室或导电系统节奏中受益的患者.
  • 这一发现支持使用SVG来个性化节奏策略并减轻PICM开发.