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相关概念视频

Cardiac Action Potential01:30

Cardiac Action Potential

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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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Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

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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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Aortic Regurgitation II: Clinical Features and Diagnostic Tests01:22

Aortic Regurgitation II: Clinical Features and Diagnostic Tests

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Aortic valve regurgitation (AR) occurs when the aortic valve fails to close properly, allowing blood to flow backward from the aorta into the left ventricle. This backflow can result in two distinct clinical presentations: acute and chronic AR, each characterized by its own set of symptoms and physical findings.Acute Aortic RegurgitationAcute AR presents with a sudden onset of severe symptoms. Patients typically experience profound dyspnea (shortness of breath), chest pain, and signs of left...
382
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...
433
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

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The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
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Cardiac Catheterization III: Left Heart Catheterization01:24

Cardiac Catheterization III: Left Heart Catheterization

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Left heart catheterization is an invasive diagnostic procedure used to evaluate the function and structure of the left side of the heart. It is generally performed to diagnose and treat cardiovascular conditions such as valve abnormalities, coronary artery disease, and congenital heart defects.Diagnostic and therapeutic purposesLeft heart catheterization serves various diagnostic and therapeutic purposes, including:Assessing coronary artery bypass grafts.Evaluating coronary artery disease in...
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相关实验视频

Updated: Jan 9, 2026

Transthoracic Echocardiography to Assess Post-Resuscitation Left Ventricular Dysfunction After Acute Myocardial Infarction and Cardiac Arrest in Pigs
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在患有左心室功能障碍的患者中进行心房再极化.

Neha Pulath1, Ramanathan Velayutham1, Anish Bhargav1

  • 1Department of Cardiology, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India.

Journal of electrocardiology
|December 5, 2025
PubMed
概括
此摘要是机器生成的。

在患有左心室功能障碍的患者中,心房再极化 (Ta波) 分散增加. 这一发现可能表明这些人心房律乱的风险增加.

关键词:
在心房里发生心律失常 (atrial arrhythmogenesis).耳前复极化是耳前复极化.左心室功能障碍是PTa波的出现.

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Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
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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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Transthoracic Echocardiography to Assess Post-Resuscitation Left Ventricular Dysfunction After Acute Myocardial Infarction and Cardiac Arrest in Pigs
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Transthoracic Echocardiography to Assess Post-Resuscitation Left Ventricular Dysfunction After Acute Myocardial Infarction and Cardiac Arrest in Pigs

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Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
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科学领域:

  • 心脏病学 心脏病学
  • 电子生理学 电子生理学
  • 心脏成像 - - 心脏成像

背景情况:

  • 前庭脱极化 (P波) 和再极化 (Ta波) 是心电图的关键组成部分.
  • 塔波通常被QRS复合体遮蔽,但在三度AV阻塞中可见.
  • 以前没有研究左心室功能障碍中的心房再极化.

研究的目的:

  • 在左心室功能障碍患者中研究心房再极化特征.
  • 为了比较正常和减少喷射分数的患者之间的PTa波参数.

主要方法:

  • 研究了患有第三级心血管阻塞和起器的患者.
  • 将患者分为正常 (LVEF ≥55%) 和减少 (LVEF ≤40%) 喷射分数组.
  • 在VVI节拍过程中分析了PTa段的持续时间,振幅,轴和ECG的分散.

主要成果:

  • 两组之间没有PTa波长,振幅或轴的显著差异.
  • 与正常喷射分数组 (54 ± 14 ms) 相比,减少喷射分数组 (74 ± 21 ms) 的PTa分散显著更高.

结论:

  • 左心室功能障碍不会改变PTa波幅,持续时间或轴.
  • 在左心室功能障碍中增加的PTa分散可能作为心房律乱风险升高的标志物.