Table 3.
Weighted regression between measures of Right heart metrics versus RVFAC.
| Variable (y) | Equation | R2a | Variance term |
|---|---|---|---|
| RV function | |||
| RVFWS (%) | 0.54 + 0.61 (FAC) | 0.82 | SD = 12.1% ŷ |
| RVTSmid (%) | −5.6 + 0.76 (FAC) | 0.54 | SD = 33% ŷ |
| TAPSE (mm) | 7.06 + 0.36 (FAC) | 0.25 | SD = 24.7% ŷ |
| TAPSE (mm) | 7.0 + 0.57 (RVFWS) | 0.28 | SD = 22% ŷ |
| RV size | |||
| RVEDAi (cm2/m2) | 29.3 – 0.46 (FAC) | 0.35 | SD = 18% ŷ |
| RVESAi (cm2/m2) | 26.5 – 0.51 (FAC) | 0.54 | SD = 18.5% ŷ |
| RVEDAr | 3.4 – 0.076 (FAC) | 0.44 | SD = 25% ŷ |
| RVESAr | 5.5 – 0.13 (FAC) | 0.48 | SD = 28.6% ŷ |
| RVESA (cm2) | −4.7 + 0.94 (RVEDA) | 0.97 | SD = 5.4% ŷ |
| RA size | |||
| RAA (cm2) | 34.3 – 0.56 (FAC) | 0.19 | SD = 27.5% ŷ |
| RAAi (cm2/m2) | 18.1 – 0.28 (FAC) | 0.16 | SD = 26.7% ŷ |
| RAAr | 3.0 −0.063 (FAC) | 0.27 | SD = 33.9% ŷ |
| RAVi (mL/m2) | 75− 1.5 (FAC) | 0.17 | SD = 42.6% ŷ |
| RAVi (mL/m2) | −19.1 + 5.05 (RAAi) | 0.92 | SD = 8.7% ŷ |
| RVFAC (Echo) 28 | 3.9 + 0.7 (RVEF CMR) | 0.71 | SD = 17% ŷ |
| RVFAC (Echo) 19 | 1.8 + 0.7 (RVEF CMR) | 0.46 | NA |
| RVFWS | 4.3 + 0.3 (RVEF CMR) | 0.61 | NA |
Abbreviations: RA, right atrial; RV, right ventricular; RVFAC, RV fractional area change; RVFWS, RV free wall longitudinal strain; TAPSE, tricuspid annular plane systolic excursion.
a
All relationships presented are significant p < 0.001; variance terms determined after exclusion of outlier values by Tukey method; PP indicates percent predicted value.