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Quantifying left atrial structure and function using single-plane tissue-tracking cardiac magnetic resonance.

Susumu Tao1, Luisa A Ciuffo1, Joao A C Lima1

  • 1Division of Cardiology, Johns Hopkins University School of Medicine, 600 N. Wolfe Street, Baltimore, MD 21287, USA.

Magnetic Resonance Imaging
|June 24, 2017
PubMed
Summary
This summary is machine-generated.

Single-plane tissue-tracking cardiovascular magnetic resonance (CMR) accurately quantifies left atrial (LA) volume, strain, and strain rate. This method offers a reliable alternative to biplane imaging for assessing cardiovascular health.

Keywords:
Cardiovascular magnetic resonanceLeft atriumStructure and functionTissue tracking

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Area of Science:

  • Cardiovascular Imaging
  • Cardiac MRI Technology
  • Biomarker Quantification

Background:

  • Left atrial (LA) structure and function are crucial indicators of adverse cardiovascular events.
  • Tissue-tracking cardiovascular magnetic resonance (CMR) using biplane long-axis imaging is the standard for quantifying LA volume, strain, and strain rate.
  • Assessing the accuracy of single-plane tissue-tracking CMR for LA indices is essential for clinical application.

Purpose of the Study:

  • To evaluate the accuracy of left atrial (LA) indices quantification derived from single-plane tissue-tracking CMR.
  • To compare LA indices obtained from single-plane imaging against those from standard biplane imaging.
  • To determine the reproducibility and variability of single-plane LA measurements.

Main Methods:

  • 388 subjects (162 PROSE-ICD, 208 AF cohort, 18 healthy volunteers) with cine CMR in sinus rhythm were analyzed.
  • Subjects were divided into training (n=291) and testing (n=97) sets.
  • Regression equations were developed in the training set to estimate LA indices from single-plane (four-chamber view) imaging and validated in the test set against biplane measurements.

Main Results:

  • Single-plane LA indices were systematically underestimated compared to biplane but showed high correlation (r²=0.73-0.90).
  • In the test set, LA volumetric indices demonstrated excellent reproducibility (ICC: 0.91-0.92) with low variability (16.3-22.3%).
  • LA strain and strain rate indices exhibited excellent reproducibility (ICC: 0.81-0.93) but slightly higher variability (21.7-25.4%) than volumetric indices.

Conclusions:

  • Single-plane tissue-tracking CMR provides highly accurate and reproducible LA volumetric indices compared to biplane imaging.
  • LA strain and strain rate measurements using single-plane tissue-tracking CMR are reproducible, though with slightly increased variability.
  • Single-plane CMR is a viable method for accurate LA assessment, potentially simplifying cardiac magnetic resonance protocols.