Cardiac Resynchronization Therapy-Induced Cardiac Index Increase Measured by Three-Dimensional Echocardiography Can Predict Decreases in Brain Natriuretic Peptide

CI significantly increased after CRT in patients whose BNP level decreased 6 months after CRT. However, only CI3D could predict decreases in BNP 6 months after CRT. Although CI2D was acceptable compared with CI3D, the tracking ability of CI changes was just below acceptable. CIFT has a wide limit of agreement with CI3D, with a poor tracking ability.