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Table 1 Patient group data (total number of patients = 92)

From: Expiratory time constant for determinations of plateau pressure, respiratory system compliance, and total resistance

 

VC-CMV

VC-SIMV

VC+

PSV

Number

24

13*

32†

23

Age, years,

49 ± 19

52 ± 18

50 ± 20

53 ± 20

Weight, kg,

69 ± 30

68 ± 40

81 ± 30

78 ± 27

Gender, number

21 male

3 female

9 male*

4 female

19 male

13 female†

14 male

9 female

Breathing frequency, breaths/minute,

13 ± 8

32 ± 9†

16 ± 5

20 ± 6

VT, ml/kg IBW

8 ± 4

9 ± 4

6 ± 4

7 ± 4

Paw, cm H2O

PEEP (cm H2O)

32 ± 6

7.7 ± 4.4

34 ± 7

9.9 ± 3.6

29 ± 8

7.9 ± 4

28 ± 8

7.9 ± 3

FIO2

0.43 ± 0.14

0.45 ± 0.10

0.45 ± 0.12

0.44 ± 0.09

ƬE, sec

0.58 ± 0.20

0.54 ± 0.27

0.66 ± 0.27

0.58 ± 0.18

  1. Data presented as mean ± SD unless stated otherwise. For all patient groups pulse oximeter oxygen saturation ranged from 90% to 95% and partial pressure end-tidal carbon dioxide ranged from 30 to 41 mm Hg. P <0.05 for * lowest and †greatest compared to other groups. VC-CMV, volume controlled-continuous mandatory ventilation; VC-SIMV, volume controlled-synchronized intermittent mandatory ventilation, VC+: volume control plus, PSV: pressure support ventilation, VT: tidal volume, IBW: Ideal body weight, Paw: peak airway pressure during inhalation, PEEP: positive end expiratory pressure, FIO2: fractional inhaled oxygen concentration, ƬE: expiratory time constant.
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