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相关概念视频

Electrocardiogram01:29

Electrocardiogram

2.3K
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...
2.3K
ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

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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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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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Pulse rhythm01:30

Pulse rhythm

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Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...
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基于心率变量的可穿戴式光电心电图测量是否相当于心电图? 一个模拟研究研究.

Hayden G Dewig1, Jeremy N Cohen2, Eric J Renaghan3

  • 1Rockefeller Neuroscience Institute, West Virginia University, 33 Medical Center Dr, Morgantown, WV, 26505, USA.

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概括

当脉冲到达时间的变化很高时,光电心电学衍生的心率变化 (PRV) 与心电学衍生的心率变化 (HRV) 不等. SDN可能是一个比RMSSD更可靠的PRV指标.

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科学领域:

  • 心血管生理学心血管生理学
  • 生物医学工程 生物医学工程
  • 信号处理 信号处理

背景情况:

  • 电心电图 (ECG) 衍生的心率变化 (HRV) 和光聚血学 (PPG) 衍生的"HRV" (PRV) 往往可以互换使用.
  • 脉冲到达时间 (PAT) 的变化可能会导致HRV和PRV之间的分离.

研究的目的:

  • 为了确定PRV是否等同于ECG衍生的HRV.
  • 评估PRV固有的错误是否使其有资格作为与HRV分开的独特,高质量的测量.

主要方法:

  • 贝叶斯模拟使用来自1084名受试者的心电图数据.
  • 整合了个别的PAT分散 (手腕和手指) 来建模PPG波到达时间.
  • 为HRV和PRV计算连续差异 (RMSSD) 的平方根平均值和N-N间隔的标准偏差 (SDNN),在预定义的等效界限 (ROPE) 中进行比较.

主要成果:

  • 在最低的PAT变异性 (2.0SD) 时,SDNN等效率为88.4%,RMSSD为21.4%.
  • 增加PAT变异性显著降低了SDNN和RMSSD的PRV和HRV之间的等价值.
  • 脉冲到达时间的变化增加了PRV测量的不确定性 (HDI宽度),特别是在RMSSD.

结论:

  • 在具有显著PAT变异性的个体中,PRV不是HRV的可靠替代品.
  • 当PRV被认为是一个独特的生物特征时,SDNN显示了比RMSSD更有利的测量特性,尽管这两种指标都表现出非统一的错误.