Reproducibility and repeatability of biventricular function/volume and strain parameters by 2D and 4D stress echocardiography in adult patients with repaired TOF

Abstract Funding Acknowledgements Type of funding sources: None. Background The use 2D and 4D during stress echocardiography to undertake complex measures in patients like with repaired TOF is challenging the validity these not known yet. Methods For test-retest variability, 20 no or mild pulmonary regurgitation were selected randomly underwent a cardiopulmonary exercise test (CPET) echocardiography. Intra-observer variability study was performed for all by same observer. Interobserver 5 different experienced Intraclass correlation coefficient (ICC), coefficients variation (COV) used quantify reproducibility variability. Results measures, better observed semiautomated strain than functional biventricular systolic function at baseline (ICC>.90 vs >.70, p<0.001), least COV (COV<10%). volumetric demonstrated less highest RV volume parameters (COV, 35%), followed LV 27%). CPET had an excellent agreement (ICC >.90). very low (<10%). Conclusions Semiautomated echo outperformed manual can be acceptable reproducibility. Variability despite good reproducibility, while lowest myocardial deformation.