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Table 3 Arterial blood gas analyses and respiratory values (per-protocol analysis)

From: Bronchoscopy versus an endotracheal tube mounted camera for the peri-interventional visualization of percutaneous dilatational tracheostomy - a prospective, randomized trial (VivaPDT)

 

Time point 1

Time point 2

Time point 3

 

VivaSight™

Bronchoscopy

VivaSight™

Bronchoscopy

p Value

VivaSight™

Bronchoscopy

p Value

pH

7.47 (7.44–7.50)

7.44 (7.40–7.47)

7.44 (7.41–7.47)

7.30 (7.27–7.34)a

< 0.001

7.40 (7.36–7.43)a,b

7.26 (7.22–7.30)a,b

< 0.001

PaO2, kPa

10.7 (10.1–11.3)

11.0 (10.2–11.9)

54.3 (45.7–62.9)a

52.6 (44.7–60.5)a

n.s.

50.8 (41.2–60.3)a

51.3 (43.5–59.1)a

n.s.

PaCO2, kPa

5.1 (4.6–5.6)

5.3 (4.7–5.9)

5.3 (5.0–5.7)

7.6 (6.7–8.4)a

< 0.001

5.9 (5.4–6.5)

8.3 (7.2–9.5)a,b

< 0.001

Lactate, mmol/L

0.9 (0.6–1.1)

1.0 (0.7–1.3)

0.8 (0.6–1.0)

0.9 (0.6–1.2)

n.s.

0.8 (0.6–1.0)a

0.8 (0.6–1.1)

n.s.

Hb, g/dl

8.8 (8.1–9.4)

9.0 (8.4–9.5)

8.7 (7.9–9.4)

8.9 (8.3–9.6)

n.s.

8.6 (8.0–9.3)

9.0 (8.3–9.6)

n.s.

SaO2, %

97 (96–98)

96 (96–97)

100 (100–100)a

100 (100–100)

n.s.

100 (100–100)a

100 (100–100)

n.s.

Paw, hPa

21 (18–24)

21 (19–23)

22 (19–24)

23 (21–26)

n.s.

21 (18–25)

23 (21–25)

n.s.

PEEP, hPa

7 (6–8)

7 (6–8)

7 (5–8)

7 (6–7)

n.s.

7 (6–8)

7 (6–7)

n.s.

etCO2, kPa

4.9 (4.4–5.4)

4.6 (4.1–5.1)

4.7 (4.2–5.2)

4.5 (3.6–5.4)

n.s.

5.3 (4.8–5.8)

6.4 (5.8–7.1)a,b

0.01

V t , ml

468 (388–549)

446 (386–512)

522 (295–749)

250 (148–371)a

0.001

390 (301 –478)

380 (257–465)

n.s.

MV, L/minute

8.0 (7.2–8.9)

9.6 (8.0–11.3)

6.7 (5.3–8.2)

3.5 (2.5–4.8)a

0.002

7.9 (6.0–9.8)

6.3 (4.8–7.8)a,b

n.s.

C, ml/hPa

54 (37–71)

57 (41–72)

31 (22–41)a

24 (17–34)a

n.s.

45 (25–65)

29 (22–38)a

n.s.

RR, breaths/minute

18 (16–21)

20 (17–23)

19 (17–21)

20 (18–22)

n.s.

20 (17–22)

21 (18–23)

n.s.

FiO2

0.27 (0.23–0.30)

0.32 (0.25–0.39)

0.99 (0.96–1.02)a

0.99 (0.97–1.01)a

n.s.

0.99 (0.96–1.02)a

0.99 (0.97–1.01)a

n.s.

SpO2, %

98 (97–99)

96 (95–98)

100 (100–100)a

100 (99–100)a

n.s.

100 (99–100)a

99 (99–100)a

n.s.

MAP, mmHg

82 (73–92)

83 (76–90)

87 (79–95)

81 (74–88)

n.s.

88 (81–95)

86 (81–93)

n.s.

  1. Abbreviations: PaO 2 Partial pressure of arterial oxygen, PaCO 2 Partial pressure of arterial carbon dioxide, SaO 2 Arterial oxygen saturation, Paw Airway pressure, PEEP Positive end-expiratory pressure, etCO 2 End-tidal carbon dioxide tension, V t Tidal volume, MV Minute ventilation, C Compliance, RR Respiratory rate, FiO 2 Fraction of inspired oxygen, SpO 2 Oxygen saturation as measured by pulse oximetry, MAP Mean arterial pressure, Hb Hemoglobin, n.s. Not statistically significant
  2. Data are shown as the mean and 95% confidence intervals, time point 1: before start of intervention, time point 2: before tracheal cannulation, time point 3: after insertion of tracheal cannula. Statistical analysis was done with linear mixed models. p Values in columns indicate differences between VivaSight and bronchoscopy groups at the respective time points
  3. a p < 0.05 vs. time point 1
  4. b p < 0.05 vs. time point 2