Table 5.

2D Circumferential, longitudinal and radial strains by feature tracking and comparisons with 3D strains.

Variables	PAH (n = 17)	Control (n = 17)	P value PAH vs. Control	Pearson’s Correlation (2D vs. 3D strains)
${\epsilon }_{CC}^{RV}$,%	−10.0 ± 6.4	−13.3 ± 2.8	0.067	0.61 (P < 0.0001)
${\epsilon }_{LL}^{RV}$,%	−18.3 ± 7.8	−24.3 ± 7.6	0.030	0.44 (P = 0.009)
${\epsilon }_{RR}^{RV}$,%	34.9 ± 12.6	34.3 ± 19.9	0.917	−0.16 (P = 0.379)
${\epsilon }_{CC}^{LV}$	−19.4 ± 4.5	−21.0 ± 3.6	0.272	0.45 (P = 0.007)
${\epsilon }_{LL}^{LV}$,%	−21.7 ± 3.5	−22.1 ± 3.9	0.750	0.32 (P = 0.067)
${\epsilon }_{RR}^{LV}$,%	57.7 ± 26.4	64.2 ± 26.9	0.477	0.47 (P = 0.005)
${\epsilon }_{CC}^{Sep}$,%	−15.3 ± 3.7	−17.0 ± 4.3	0.229	0.30 (P = 0.082)
${\epsilon }_{LL}^{Sep}$,%	−11.7 ± 5.9	−19.6 ± 3.4	<0.0001	0.61 (P < 0.0001)
${\epsilon }_{RR}^{Sep}$,%	34.7 ± 15.2	46.3 ± 16.8	0.043	0.65 (P < 0.0001)

${\epsilon }_{CC}^{RV}$: right ventricular peak circumferential strain; ${\epsilon }_{LL}^{RV}$: right ventricular peak longitudinal strain; ${\epsilon }_{RR}^{RV}$: right ventricular peak radial strain; ${\epsilon }_{CC}^{LV}$: left ventricular peak circumferential strain; ${\epsilon }_{LL}^{LV}$: left ventricular peak longitudinal strain; ${\epsilon }_{RR}^{LV}$: left ventricular peak radial strain; ${\epsilon }_{CC}^{Sep}$: septum peak circumferential strain; ${\epsilon }_{LL}^{Sep}$: septum peak longitudinal strain; ${\epsilon }_{RR}^{Sep}$: septum peak radial strain; PAH: pulmonary arterial hypertension.