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相关概念视频

Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

8.3K
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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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...
160
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

868
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...
868
ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

3.8K
An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
Components of the Electrocardiogram
The primary components of a normal ECG waveform in Normal sinus rhythm(NSR) include the P wave, PR interval, QRS complex, ST segment, T wave, and occasionally a U wave.
ECG waveforms are divided by vertical and horizontal lines at standard intervals.
The horizontal axis measures time and rate, and the vertical axis measures amplitude or voltage....
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Electrocardiogram01:29

Electrocardiogram

3.2K
An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...
3.2K

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相关实验视频

Updated: Sep 9, 2025

Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
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Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation

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在ECGI中估计心房LAT的贝叶斯框架

Carlos Fambuena-Santos, Clara Herrero, Santiago Ros

    IEEE transactions on medical imaging
    |August 29, 2025
    PubMed
    概括
    此摘要是机器生成的。

    一个新的贝叶斯框架使用非侵入性心电图像 (ECGI) 准确估计心脏电活动. 这种方法优于传统技术,减少了人工物并改善了心律失常的映射.

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    Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice
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    相关实验视频

    Last Updated: Sep 9, 2025

    Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
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    Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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    Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

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    科学领域:

    • 心脏病学
    • 生物医学工程
    • 计算生物学

    背景情况:

    • 局部激活时间 (LAT) 地图提供了对心脏电传播的关键见解.
    • 使用侵袭性系统的传统LAT估计方法在应用于非侵袭性ECGI信号时会产生人工物.
    • 现有的非侵入性方法如-dV/dt和时空梯度 (STG) 在准确性和文物生成方面存在局限性.

    研究的目的:

    • 引入和评估一个新的贝叶斯框架来估计ECGI信号的LAT.
    • 将贝叶斯框架的性能与传统的 -dV/dt 和 STG 方法进行比较.
    • 评估该框架能够准确地绘制心脏电活动,并识别没有器件的阻塞线 (LoB).

    主要方法:

    • 使用ECGI数据开发一个新的贝叶斯框架来估计LAT.
    • 使用不同噪声级别的化步调模型进行验证.
    • 对两名患者的临床评估:一个在鼻腔节律和一个在节奏过程中进行的腔位 (CTI) 移除后.

    主要成果:

    • 贝叶斯方法在模拟中实现了比尔森相关系数>0.91,在噪声水平上显著超过了-dV/dt (0.75-0.81) 和STG (0.78-0.86).
    • 在低噪音条件下,最早和最晚激活位置的识别误差降低了0.8厘米.
    • 在临床上,贝叶斯框架准确地确定了真实LoB,并在模拟数据中平均减少了1%的人工LoB.

    结论:

    • 新的贝叶斯框架为使用ECGI进行非侵入性LAT估计提供了重大进展.
    • 这种方法提供了准确的,无人工物心脏测绘, 性能优于传统技术.
    • 它代表了一种有前途的替代方案,用于有效和精确地绘制心律失常.