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Table 1 Baseline characteristics and management during mechanical ventilation of included patients

From: Management and outcome of mechanically ventilated patients after cardiac arrest

 

Cohort 1998

Cohort 2004

Cohort 2010

P

(N = 100)

(N = 239)

(N = 473)

Age, years, mean (SD)

66 (14)

63 (16)

63 (16)

0.261

Female, n (%)

37 (37)

90 (38)

174 (37)

0.966

Body mass index, kg/cm2, mean (SD)

na

27 (8)

27 (7)

0.754

SAPS II, points, mean (SD)

61 (19)

56 (20)

59 (20)

0.060

Glasgow Coma Score at admission, median (IQR)

na

6 (3-15)

3 (3-8)

<0.001

Arterial blood gases at admission

    

 pHa, mean (SD)

7.17 (0.09)

7.23 (0.20)

7.23 (0.18)

0.003

 PaCO2, mmHg, mean (SD)

50 (13)

48 (22)

50 (23)

0.733

 Ratio PaO2 to FiO2, mmHg, mean (SD)

249 (78)

233 (116)

221 (186)

0.367

Ventilatory settings during mechanical ventilation

    

 Tidal volume, ml/kg ABW, mean (SD)

8.9 (2)

7.4 (2)

6.7 (2)

<0.001

 Tidal volume/kg PBW mean (SD)

na

9.04 (2.3)

7.95 (1.7)

<0.001

 Respiratory rate, bpm, mean (SD)

17 (4)

18 (6)

19 (6)

<0.001

 PEEP, cmH2O, mean (SD)

3.5 (3)

4.8 (4)

6.5 (3)

<0.001

 Peak pressure, cmH2O, mean (SD)

29.1 (7.5)

27.1 (7.9)

24.1 (7.9)

<0.001

 Plateau pressure, cmH2O, mean (SD)

22.7 (3.7)

21.5 (6.5)

19.5 (6.3)

<0.001

 PaCO2, , mmHg, mean (SD)

37.3 (7.4)

38.8 (10.4)

39.8 (11.7)

<0.001

 pHa, mean (SD)

7.41 (0.08)

7.39 (0.1)

7.39 (0.1)

<0.001

 Ratio PaO2 to FiO2, mmHg, mean (SD)

238 (95)

242 (95)

252 (114)

<0.05

Sedation, n (%)

50 (50)

175 (73)

332 (70)

<0.001

Analgesia, n (%)

20 (20)

na

272 (58)

<0.001

Neuromuscular blocking, n (%)

8 (8)

29 (12)

99 (21)

<0.001

  1. ABW, actual body weight; IQR, interquartile range; na, no data available, PCV, Pressure controlled ventilation; PEEP, Positive end-expiratory pressure; pHa, arterial pH; SAPS, Simplified Acute Physiology Score; SD, standard deviation.