Table 2 Ultrasound measurements and the calculated parameters

Parameters in supine position

 LVOT^a diameter (cm)

1.8 ± 0.1

1.8 ± 0.1

0.575

 LVEDA_s^b (cm²)

11.9 ± 2.7

10.4 ± 1.8

0.002※

 VTI_s^c (cm)

24.8 ± 3.6

21.7 ± 4.4

0.001※

 SV_s^d (ml)

63.8 ± 11.8

54.8 ± 12.8

0.002※

 CO_s^e (L·min⁻¹)

4.9 ± 0.9

4.6 ± 1.0

0.227

 SVR^f (dyn·s·cm⁻⁵)

1487 ± 295

1582 ± 390

0.243

 SVRI^j (dyn·s·cm⁻⁵·m⁻²)

2536 ± 475

2711 ± 638

0.184

Parameters in left lateral position

 LVEDA_l (cm²)

12.4 ± 1.9

11.8 ± 2.0‡‡

0.217

 VTI_l (cm)

22.8 ± 3.7‡‡

23.0 ± 4.0§§

0.798

 SV_l (ml)

58.7 ± 11.0‡‡

58.2 ± 12.0§§

0.841

 CO_l (L·min⁻¹)

4.4 ± 0.8‡‡

4.7 ± 1.0

0.098

Percentage change between positions^¶¶

 LVEDA%

7.0% ± 19.7%

16.2% ± 20.5%

0.044 ※

 VTI%

 − 7.4% ± 12.6%

8.3% ± 17.8%

 < 0.001※

 SV%

 − 7.2% ± 12.7%

8.2% ± 17.8%

 < 0.001 ※

 CO%

 − 9.3% ± 13.0%

4.3% ± 16.5%

 < 0.001※