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Table 1 Ventilatory and haemodynamic effects (lower panel) caused by changes in ventilator settings (upper panel)

From: Beat-to-beat changes in stroke volume precede the general circulatory effects of mechanical ventilation: a case report

 

Baseline (Fig. 1a)

I

II

III

IV (Fig. 1c)

V (Fig. 1b)

VI

VR (min-1)

60

60

60

40

60

60

75

I:E ratio

1:2

1:2

1:2

1:2

1:1

1:1

1:1

IT (ms)

330

330

330

500

500

500

400

PIP (cmH2O)

38

40

42

40

40

38

38

VPP

No

No

No

Yes

Yes

Yes

No

O2 saturation (%)

46

77

79

82

73

85

87

BPmean (mmHg)

35

34

32

34

36

35

37

HR (beats/min)

107

106

103

106

110

107

103

SVmax (ml)

6.2

6.6

5.6

6.4

6.6

7.9

6.2

I:E SV ratio

1.0

0.7

0.6

0.3

0.2

0.2

0.9

CO (ml/min)

655

610

445

410

416

635

612

Hb oxygen delivery (ml/min)

52

80

60

58

52

92

91

  1. Inspired oxygen fraction (FiO2) was 1.0, and PEEP was kept at 5 cmH2O. Baseline ventilatory settings are shown in italics and changes from baseline are shown in bold. VR, ventilatory rate; I, inspiratory; E, expiratory; T, time; VPP, ventilatory pressure plateau; BP, blood pressure; HR, heart rate. For spectral ultrasound Doppler measurements from the left ventricular outflow tract: SV, stroke volume [area under curve during ejection (cm) multiplied by flow area (0.9 cm2)]; CO, from SVmean × HR calculated cardiac output; haemoglobin (Hb) oxygen delivery was calculated from haemoglobin content, O2 saturation and CO.