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相关概念视频

Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

11.5K
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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Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

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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...
1.3K
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

719
Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
719
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...
421
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

8.6K
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...
8.6K
Electrocardiogram01:29

Electrocardiogram

5.3K
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...
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相关实验视频

Updated: Jan 8, 2026

Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice
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Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice

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威伦斯模式:相同的心电图曲线,不同的路径

Giovanni Arghittu1, Manuela Iseppi2, Davide Giovannini2

  • 1Division of Cardiology, Ospedale Santa Chiara, Azienda Provinciale per i Servizi Sanitari della Provincia Autonoma di Trento, Trento, Italy; Division of Cardiology, Department of Medicine, University of Verona, Verona, Italy.

JACC. Case reports
|December 15, 2025
PubMed
概括
此摘要是机器生成的。

及时识别威伦斯综合征,即表明临界左前下降动脉狭窄的心电图模式,至关重要. 及时干预可以改善这种经常错过的疾病患者的结果.

关键词:
急性冠状动脉综合征是什么胸部疼痛 胸部疼痛 胸部疼痛电心电图 (ECG) 是一种心电图.

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相关实验视频

Last Updated: Jan 8, 2026

Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice
06:07

Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice

Published on: May 23, 2021

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Optocardiography and Electrophysiology Studies of Ex Vivo Langendorff-perfused Hearts
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Optocardiography and Electrophysiology Studies of Ex Vivo Langendorff-perfused Hearts

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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 心脏病学
  • 诊断性心电图谱 诊断性心电图谱

背景情况:

  • 惠伦斯综合征是T波逆转在V2-V3.3中的心电图模式.
  • 这意味着临界近位左前下降动脉狭窄.
  • 往往呈现无症状与正常的热素水平,导致不足的识别.

研究的目的:

  • 强调迅速识别威伦斯综合征的重要性.
  • 为了证明延迟诊断对患者结果的影响.
  • 强调对关键冠状动脉狭窄的及时干预.

主要方法:

  • 4名患者 (3名女性,1名男性,平均年龄64岁) 的病例系列呈现出不稳定的心痛或NSTEMI.
  • 对韦伦斯模式进行心电图分析.
  • 基于及时与延迟诊断和干预的结果的比较.

主要成果:

  • 两个患者迅速识别了韦伦斯综合征,得到了及时的干预.
  • 两个患者最初错过了诊断,导致延迟干预.
  • 这项研究强调了诊断识别的变化.

结论:

  • 在威伦斯综合征中,迅速识别和及时干预至关重要.
  • 及时采取行动可以改善预后,减少心肌损伤和保存左心室喷射分数.
  • 强调需要提高惠伦斯综合征的认识和诊断准确度.