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Related Experiment Video

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Modified continuity equation using left ventricular outflow tract three-dimensional imaging for aortic valve area

Pedro Pinto Teixeira1, Ruben Ramos1, Pedro Rio1

  • 1Cardiology Department, Hospital de Santa Marta, Lisboa, Portugal.

Echocardiography (Mount Kisco, N.Y.)
|June 8, 2017
PubMed
Summary

Standard 2D and 3D echocardiography underestimate left ventricular outflow tract area compared to MDCT, impacting aortic valve area calculations. Multidetector computed tomography offers improved accuracy for aortic stenosis assessment.

Keywords:
aortic stenosisaortic valve replacementcomputed tomographythree-dimensional echocardiography

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Area of Science:

  • Cardiovascular Imaging
  • Echocardiography
  • Computed Tomography

Background:

  • Aortic valve area (AVA) estimation commonly uses the continuity equation (CE), assuming a circular left ventricular outflow tract (LVOT).
  • Accurate LVOT and AVA measurements are crucial for diagnosing and managing aortic stenosis (AS).

Purpose of the Study:

  • To compare LVOT area measurements using 2D transthoracic echocardiography (2DTTE), 3D transesophageal echocardiography (3DTEE), and multidetector computed tomography (MDCT).
  • To assess the impact of different LVOT area measurements on AVA estimation by the CE.

Main Methods:

  • Prospective enrollment of 60 patients with severe AS undergoing transcatheter aortic valve replacement (TAVR).
  • Systematic acquisition of 2DTTE, 3DTEE, and MDCT imaging for LVOT area assessment.
  • Calculation of AVA using the CE with LVOT areas derived from each imaging modality.

Main Results:

  • MDCT revealed a significantly larger mean LVOT area (4.31±0.99 cm² ) compared to 2DTTE (3.28±0.66 cm²) and 3DTEE (3.95±0.90 cm²).
  • LVOT shape was predominantly elliptical (eccentricity index 1.47) rather than circular.
  • AVA calculated using MDCT-derived LVOT area (0.80±0.24 cm²) was higher than that from 2DTTE (0.62±0.20 cm²) or 3DTEE (0.74±0.24 cm²).
  • MDCT-based AVA reclassified 24% of patients from severe to moderate AS.

Conclusions:

  • 2DTTE and 3DTEE significantly underestimate LVOT area compared to MDCT, affecting AVA calculations.
  • MDCT-derived AVA provides a more accurate assessment, particularly valuable in cases with discrepant AS severity criteria.
  • MDCT fusion AVA may enhance diagnostic precision for aortic stenosis severity.