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Table 1 Baseline characteristics of study patients

From: Occurrence of pendelluft under pressure support ventilation in patients who failed a spontaneous breathing trial: an observational study

Baseline data

All patients, n = 20

Low-pendelluft group n = 12

High-pendelluft group n = 8

p-value

Age, years

65 ± 9

63 ± 9

68 ± 7

.187

Female sex, n (%)

9 (45)

5 (42)

4 (50)

.535

Body mass index, kg/m2

25.5 [22.2–27.4]

25.7 [22–27.7]

25.2 [22.3–27.3]

.791

SAPS2 (ICU admission)

55 ± 19

56 ± 19

52 ± 19

.661

Reason for admission, n (%)

   

.109

Medical

15 (75)

11 (92)

4 (50)

 

Emergency surgery

5 (25)

1 (8)

4 (50)

 

ARDS, n. (%)

12 (60)

9 (75)

3 (37)

.167

Days on CMV

3 [2:7]

3 [1:7]

3 [2:5]

1

ICU days

13 [6:19]

13 [4:27]

13 [12:16]

.970

AMV days

10 [3:14]

12 [2:16]

9 [5:11]

.343

PaO2/FiO2, torr

253 ± 62

233 ± 60

282 ± 54

.078

PEEP, cmH2O

8 [7:8]

8 [7:8]

8 [7:8]

.970

NIF, cmH2O

22 ± 11

22 ± 11

21 ± 11

.816

Clinical PSV, cmH2O

10 [8:10]

10 [8:10]

9 [8:11]

.624

CPLrs, ml/cmH2O

48 ± 14

46 ± 12

51 ± 16

.413

Tidal volume, mL

462 [393:541]

487 [335:541]

445 [412:562]

.734

Respiratory rate, bpm

20 ± 7

20 ± 7

20 ± 7

.959

Minute ventilation, L/min

9.5 [6.5:11.5]

8.7 [6.1:10.6]

10.3 [6.5:12.7]

.571

End-tidal CO2, mmHg

38 [31:42]

38 [30:54]

38 [31:42]

.762

p0.1, cmH2O

1.4 [0.8:2.2]

1.4 [0.9:2.3]

1.2 [0.5:2.1]

.473

RSBi, bpm/L

42 [28:64]

47 [28:65]

38 [27:63]

.537

Tv DEP,  %

40 ± 12

37 ± 12

44 ± 12

.188

Pendelluft, mL

3.3 [2.1:8.8]

2.3 [1:3.3]

8.4 [3.7:22.2]

.003

 To ventral ROIs, mL

0 [0:0.3]

0 [0:1.3]

0 [0:0.7]

.415

 To dorsal ROIs, mL

2.6 [1.4:12.9]

1.6 [0.3:2.8]

7.9 [3.7:22.2]

.002

  1. SAPS2, Simplified Acute Physiology Score II; ICU, intensive care unit; CMV, controlled mechanical ventilation; AMV, assisted mechanical ventilation; PEEP, positive end-expiratory pressure; NIF, negative inspiratory force; PSV, pressure support ventilation; CPLrs, compliance of the respiratory system; bpm, breaths per minute; p0.1, occlusion pressure at 100 ms; RSBi, Rapid Shallow Breathing index; Tv DEP, distribution of tidal volume to dependent lung regions. Data are expressed as mean ± SD or median [25th:75th percentile]