Table 2 Parameters of different angle of head of bed(HOB)

CI(L/min/m²)

2.3(2.1–2.5)

2.1(1.9–2.4)*

2.0(1.8-2.0)*†

1.8(1.7–2.1)*†‡

< 0.0001

Heart Rate(bpm)

88(79–95)

88(79–97)

90(80–96)*†

92(81–98)*†

< 0.0001

MAP(mmHg)

75 ± 6

75 ± 6

76 ± 6

76 ± 6

0.06

NE(µg/kg/min)

0.086 ± 0.067

0.088 ± 0.068

0.090 ± 0.069

0.090 ± 0.067

0.55

IAP(mmHg)

14(13–16)

16(14–18)*

17(15–18)*†

19(18–21)*†‡

< 0.0001

APP(mmHg)

61 ± 6

59 ± 6*

59 ± 6*

57 ± 6*†‡

< 0.0001

SMA-TAMV (cm/s)

20.0(17.4–24.0)

15.9 (12.9–19.4)*

15.2(13.2–20.1)*

14.2(11.3–17.7)*†‡

< 0.0001

SMA-D(cm)

0.54(0.52–0.57)

0.53(0.51–0.56)

0.53(0.50–0.55)*†

0.51(0.49–0.53)*†‡

< 0.0001

SMABF(ml/min)

269(244–322)

204(183–234)*

200(169–244)*

164(139–212)*†‡

< 0.0001

SMABF/CO(%)

6.9(6.4–7.6)

5.7(5.0-6.4)*

5.9(5.1–6.8)*

5.1(4.5–6.4)*†‡

< 0.0001

CABF(ml/min)

424(368–483)

376(332–472)*

389(310–438)*

291(241–383)*†‡

< 0.0001

CABF/CO(%)

10.8 ± 2.0

10.6 ± 2.1

10.8 ± 2.6

9.5 ± 2.6*†‡

< 0.0001

PPI

1.60(0.79–2.76)

1.30(0.74–2.50)*

1.20(0.63–2.10)*†

1.10(0.40–1.60)*†‡

< 0.0001