Novel Algorithm Transforms Echocardiographic Assessment of Heart Filling Pressures

METHODOLOGY:

Researchers conducted an observational study involving 951 patients referred for cardiac catheterization across multiple centers in the United States, Norway, South Korea, Spain, and Japan.
The analysis included echocardiographic measurements of mitral inflow; the velocities of the pulmonary vein, tissue Doppler mitral annulus, and tricuspid regurgitation; as well as left atrial strain.
LVFP greater than 15 mm Hg was designated as abnormally elevated.
A secondary evaluation incorporated left atrial reservoir strain, left atrial maximum volume index, isovolumic relaxation time, and pulmonary vein flow when initial variables were discordant or incomplete.

The new algorithm achieved a sensitivity of 86% and a specificity of 86%, with an overall accuracy of 86% in 949 patients, significantly outperforming joint 2016 guidelines from the American Society of Echocardiography and the European Association of Cardiovascular Imaging (P < .0001).
For patients with normal LVEF, the algorithm demonstrated 85% sensitivity, 87% specificity, and 86% accuracy, showing significant improvement over previous guidelines (P < .0001).
In patients with reduced LVEF, the algorithm had 92% sensitivity, 77% specificity, and 87% accuracy.
The model also was more accurate than the guidelines for patients with an ejection fraction of 50% or greater (P < .0001).
The net reclassification improvement for echocardiography over natriuretic peptides was 1.1 (P < .0001), with integrated discrimination improvement of 0.3 (P < .0001).

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