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Estimation of the Physical Quantities01:05

Estimation of the Physical Quantities

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On many occasions, physicists, other scientists, and engineers need to make estimates of a particular quantity. These are sometimes referred to as guesstimates, order-of-magnitude approximations, back-of-the-envelope calculations, or Fermi calculations. The physicist Enrico Fermi was famous for his ability to estimate various kinds of data with surprising precision. Estimating does not mean guessing a number or a formula at random. Instead, estimation means using prior experience and sound...
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Transthoracic Speckle Tracking Echocardiography for the Quantitative Assessment of Left Ventricular Myocardial Deformation
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确定QRS轴:视觉估计等于计算.

Johanna Mueller-Leisse1, Giulia Syrbius2, Henrike Aenne Katrin Hillmann2

  • 1Hannover Heart Rhythm Center, Department of Cardiology & Angiology, Hannover Medical School, Carl-Neuberg Str. 1, 30625, Hannover, Germany. mueller-leisse.johanna@mh-hannover.de.

Herzschrittmachertherapie & Elektrophysiologie
|January 27, 2025
PubMed
概括
此摘要是机器生成的。

使用六轴参考系统对QRS轴的视觉估计与计算值密切相关. 这种方法对于大多数涉及心电图 (ECG) 和早产腹腔综合体 (PVC) 的临床应用足够准确.

关键词:
12--心电图-心电图关于心电图的基本知识六轴参考系统 六轴参考系统输出通道中的PVC是PVC.在PVC形态上,PVC的形态是:

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相关实验视频

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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
  • 医疗成像医学成像
  • 诊断工具 诊断工具

背景情况:

  • 电心电图 (ECG) 上的QRS轴非常重要,但通常是粗略估计的.
  • 精确的QRS轴的确定对于诸如确定早产腹腔复合体 (PVCs) 的起源等场景非常有价值.
  • 使用六轴参考系统进行视觉估计为更准确的QRS轴确定提供了一种方法.

研究的目的:

  • 评估视觉估计的QRS轴与数学计算的QRS轴之间的相关性.
  • 为了评估视觉QRS轴估计在患有流出通道PVC的患者的准确性.

主要方法:

  • 来自PVC数据库 (2012-2020) 的12ECG分析,用于流出道PVC.
  • 由两名医生使用六轴参考系统 (±10度准确度) 视觉QRS轴的确定.
  • 使用三种已确定的基于电压的公式计算QRS轴.

主要成果:

  • 在视觉估计和计算的QRS轴之间发现了强烈的相关性,无论是定期进行的节拍 (r=0.97-0.98) 还是PVC (r=0.94).
  • 估计QRS轴对定期进行的节拍是39±40°,对于PVC是88±15°.
  • 计算的QRS轴与所有公式和节拍类型的视觉估计密切匹配.

结论:

  • 复杂的QRS轴的视觉估计是一种可靠的方法.
  • 这种视觉估计与基于电压的计算有很好的相关性.
  • 在心电图分析中,视觉方法对于大多数临床目的是足够的.