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. 2021 Jan 20;30(4):193–200. doi: 10.4103/jcecho.jcecho_41_20

Table 2.

Comparison between the echocardiographic data between the two groups

Variables Group type (mean±SD) Paired t-test


Group 1 (6MWT <330 m) Group 2 (6MWT ≥330 m) t P
RV variables
 RV systolic pressure (mmHg) 87.81±22.79 60.08±19.38 3.642 0.001
 Mean pulmonary artery pressure (mmHg) 47.14±12.92 33.23±10.76 3.243 0.003
 RV base diameter (cm) 4.41±0.83 4.05±0.54 1.385 0.176
 Indexed RV base diameter (cm/m2) 2.97±0.81 3.26±1.09 −0.889 0.381
 RV mid-diameter (cm) 3.68±1 3.57±0.54 0.368 0.715
 Indexed RV mid-diameter (cm/m2) 2.51±0.71 3.07±1.09 −1.82 0.078
 RV longitudinal diameter (cm) 7.43±1.41 7.23±1.27 0.422 0.676
 Indexed RV longitudinal (cm/m2) 5.35±1.5 6.13±1.96 −1.317 0.197
 RV outflow diameter (cm) 2.39±0.72 2.13±0.33 1.223 0.23
 Indexed RV outflow diameter (cm/m2) 1.75±0.67 1.88±0.72 −0.512 0.612
 RA longitudinal dimension (cm) 4.77±1.09 4.55±1 0.593 0.558
 Indexed RA longitudinal dimension (cm/m2) 3.46±1.2 3.9±1.37 −0.975 0.337
 RA transverse dimension (cm) 4.37±1.33 3.74±0.91 1.499 0.144
 Indexed RA transverse dimension (cm/m2) 3.18±1.24 3.2±1.22 −0.055 0.957
 Inferior venae cava (cm) 1.45±0.34 1.25±0.25 1.882 0.069
 TAPSE (cm) 1.71±0.18 1.8±0.19 1.397 0.172
 Fractional area change (%) 37.07±5.54 40.92±4.77 −2.074 0.046
 RV wall thickness (cm) 0.88±0.21 0.72±0.19 2.190 0.036
 RV global longitudinal strain (%) −19.33±3.55 −22.53±5.23 −2.127 0.041
 Ś of RV free wall (cm/sec) 10.62±1.83 11.38±1.71 −1.215 0.233
 É of RV free wall (cm/sec) 11±2.28 12.08±1.98 −1.405 0.170
 RV myocardial performance index 0.54±0.07 0.48±0.09 2.405 0.022
LV variables
 EF by M-mode (%) 63.23±6.54 66.85±4.65 −1.732 0.093
 EF by Simpson’s method (%) 58.00±6.99 61.69±4.68 −1.682 0.102
 LVEDD (cm) 4.38±0.69 4.08±0.76 1.205 0.237
 indexed LVEDD (cm/m2) 3.06±0.81 3.23±0.94 −0.571 0.572
 LVESD (cm) 3.1±0.61 2.78±0.63 1.460 0.154
 Indexed LVESD (cm/m2) 2.37±0.89 2.31±0.65 0.207 0.837
 E’ LV septal wall (cm/s) 10.52±2.86 12.31±1.6 −2.053 0.048
 E’ LV lateral wall 11.62±2.77 14.15±1.86 −2.912 0.006
 E/A ratio 0.95±0.28 1.24±0.26 −3.033 0.005
 E/e’ 8.79±1.53 7.26±1.04 3.143 0.004
 LV myocardial performance index 0.51±0.08 0.42±0.06 3.440 0.002
 LV global longitudinal strain −18.58±4.09 −20.91±2.99 1.776 0.085
 LV global circumferential strain −14.08±7.2 −15.75±11.11 0.536 0.596
 LV global radial strain 29.31±5.47 39.52±8.39 −4.307 0.000
Oxygen saturation
 Saturation (%) before 89.86±6.39 95.85±2.61 −3.203 0.003
 Saturation (%) after 85.24±9.39 94.46±3.95 −3.347 0.002
 Desaturation value 4.62±3.46 1.38±1.66 3.143 0.004

TAPSE=Tricuspid annular plan systolic excursion, LVEDD=Left ventricle end-diastolic dimension, LVESD=Left ventricle end-systolic dimension, LV=Left ventricle, RV=Right ventricle, SD=Standard deviation, 6MWT=6-min walk test