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相关概念视频

Electrocardiogram01:29

Electrocardiogram

1.6K
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...
1.6K
ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

270
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....
270
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

431
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...
431
Correlation between ECG and Cardiac Cycle01:24

Correlation between ECG and Cardiac Cycle

2.7K
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...
2.7K
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

150
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,...
150
Cardiac Action Potential01:30

Cardiac Action Potential

567
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
567

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相关实验视频

Updated: May 9, 2025

Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function
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Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function

Published on: December 11, 2019

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识别影响心电图持续时间的人口因素,采集使用单线心电图补丁装置.

Dillon J Dzikowicz1,2, Mehmed Aktas2, Betty Mykins2

  • 1School of Nursing, University of Rochester, Rochester, New York, USA.

Annals of noninvasive electrocardiology : the official journal of the International Society for Holter and Noninvasive Electrocardiology, Inc
|May 5, 2025
PubMed
概括

高体重指数 (BMI) 降低了ECG贴片的坚持,因为粘合问题. 需要改进的粘合技术,以便在所有患者中更好地检测心房动.

关键词:
诊断技术和程序的诊断技术和程序.电心电图 门诊式 门诊式 电心电图心脏功能测试测试的心脏功能测试监测 门诊监测 门诊监测

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Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice
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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
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相关实验视频

Last Updated: May 9, 2025

Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function
05:03

Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function

Published on: December 11, 2019

8.5K
Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice
06:07

Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice

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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

Published on: December 28, 2012

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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

背景情况:

  • 心房动 (AF) 是最常见的心律失常,影响3%的美国成年人.
  • 门诊心电图 (ECG) 监测对于AF检测至关重要,但传统方法存在局限性.
  • 电图贴片提供了延长的监测,但皮肤电极接触是关键的限制因素.

研究的目的:

  • 分析影响心电图贴片记录时间的人类和技术因素.
  • 报告256名AF患者使用Zio心电图贴片的经验.

主要方法:

  • 使用Zio ECG贴片分析之前记录的数据.
  • 描述性统计和后勤回归以确定与记录持续时间相关的因素.
  • 评估影响补丁合规性的人类和技术因素.

主要成果:

  • 更高的身体质量指数 (BMI) 是较差的ECG贴片符合性的独立预测指标.
  • 在11%的患者中,粘合失败是违规的主要原因.
  • 符合性显示了与BMI的剂量依赖的负相关性.

结论:

  • 体重指数显著影响心电图贴片的合规性,主要是由于粘合剂的故障.
  • 对于BMI较高的患者,需要改进的粘合技术.
  • 未来的设备开发应该专注于在不同患者群体中保持皮肤电极接触.