ABC | Volume 113, Nº5, November 2019

Original Article Saraiva et al. Normal values for new echocardiographic techniques Arq Bras Cardiol. 2019; 113(5):935-945 Table 5 – Multiple linear regression to determine independent predictors of new echocardiographic indexes β coefficients ± standard error P value adjusted R 2 Min LA Vol Age 0.07 ± 0.03 0.02 0.06 Pre-A LA Vol Age 0.10 ± 0.03 0.002 0.15 Male 1.57 ± 0.7 0.02 Total LA EF Age -0.21 ± 0.09 0.02 0.09 Male -3.7 ± 1.8 0.04 Passive LA EF Age -0.27 ± 0.11 0.01 0.24 Male -5.3 ± 2.0 0.01 BMI -0.9 ± 0.3 0.01 LAScd Age -0.16 ± 0.05 0.003 0.29 BMI -0.60 ± 0.17 0.0006 LASr Age -0.17 ± 0.06 0.0007 0.25 BMI -0.67 ± 0.20 0.001 LV end-diastolic volume Age -0.36 ± 0.14 0.01 0.08 LV end-systolic volume Age -0.19 ± 0.07 0.007 0.10 LV-GLS BMI 0.23 ± 0.09 0.01 0.07 LV-GCS Male 1.6 ± 0.7 0.03 0.05 Peak apical rotation Age 0.12 ± 0.05 0.01 0.07 Peak twist Age 0.14 ± 0.06 0.02 0.08 Peak torsion Age 0.02 ± 0.007 0.02 0.07 RV-GLS BMI 0.31 ± 0.10 0.002 0.18 Ethnicity 0.71 ± 0.10 0.05 RV-fwLS BMI 0.56 ± 0.17 0.002 0.13 EF: emptying fraction; LA: left atrium; LASct: peak negative global LA ε; LAScd: peak positive global LA ε; LASr: total global LA ε; Max: maximum; Min: minimum; Pre-A LA vol: LA volume at the onset of LA contraction; 3DE: three-dimensional echocardiography; Vol: volume; RV-fwLS: RV free wall longitudinal strain; RV‑GLS: global RV longitudinal strain. a Student’s test-t comparing men vs. women. LA ε reference values due tomethodological variations (reference frame set to zero strain: P wave or QRS complex onset; inclusion or exclusion of LA roof; apical views used for LA ε analysis; machines or software packages from different vendors), 15-17 and influence of age, 7 LV diastolic function, 7 LV end-diastolic pressure, 18 and image quality over LA ε parameters. 941