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Electrocardiogram01:29

Electrocardiogram

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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.
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Electrocardiogram Fundamentals01:28

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Introduction
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Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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Identifying left ventricular dysfunction using prospective electrocardiogram-triggered coronary computed tomography

Ashwin Sharma1, Fernanda Erthal2, Daniel Juneau3

  • 1Department of Medicine (Cardiology), University of Ottawa Heart Institute, Ontario, Canada.

Journal of Cardiovascular Computed Tomography
|January 31, 2024
PubMed
Summary
This summary is machine-generated.

Prospectively ECG-triggered CCTA can identify reduced left ventricular ejection fraction (LVEF) using indexed LV mid-diastolic volume (LVMDVi) and LVMDV:LVMass ratio. These CCTA-derived metrics provide thresholds for further LV function assessment.

Keywords:
Coronary computed tomography angiographyHeart failureLeft ventricular ejection fractionLeft ventricular massMid-diastolic volume

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Area of Science:

  • Cardiology
  • Radiology
  • Medical Imaging

Background:

  • Coronary computed tomography angiography (CCTA) is crucial for assessing coronary artery disease.
  • Left ventricular (LV) mid-diastolic volume (LVMDV) and LV mass (LVMass) from CCTA offer prognostic insights.
  • The predictive value of prospectively ECG-triggered CCTA for reduced LV ejection fraction (LVEF) remains unclear.

Purpose of the Study:

  • To determine if indexed LVMDV (LVMDVi) and the LVMDV:LVMass ratio derived from CCTA can identify patients with reduced LVEF.
  • To establish reference thresholds for these CCTA-derived parameters.

Main Methods:

  • Analysis of 8179 patients who underwent prospectively ECG-triggered CCTA.
  • Derivation of normal LVMDVi and LVMDV:LVMass values from 4352 healthy individuals.
  • Validation of sex-specific thresholds in 1783 patients with known LVEF to identify abnormal LVEF (≤35% and ≤30%).

Main Results:

  • LVMDVi and LVMDV:LVMass were significantly higher in patients with reduced LVEF compared to those with normal LVEF (p < 0.001).
  • Both parameters increased with the severity of LVEF reduction.
  • Sex-specific LVMDVi thresholds showed high specificity for identifying abnormal LVEF in males and females.
  • LVMDV:LVMass thresholds demonstrated high specificity (87%) for both sexes.

Conclusions:

  • Prospectively ECG-triggered CCTA-derived LVMDVi and LVMDV:LVMass can effectively identify patients with reduced LVEF.
  • Established reference thresholds aid in identifying individuals requiring further LV function evaluation.
  • These CCTA metrics offer valuable non-invasive assessment of LV function.