Skip to main content

Table 1 Respiratory variables

From: Cerebral metabolism is not affected by moderate hyperventilation in patients with traumatic brain injury

n = 11

A

Baseline

B

Minute ventilation

C

Moderate hyperventilation

D

50 min of moderate hyperventilation

E

Return to baseline

etCO2 (kPa)

5.0 (0.7)

4.3 (0.6)*

4.2 (0.6)*§

4.0 (0.7)*§

4.7 (0.7)*§¶Ŧ

MV (L/min)

6.9 (1.4)

8.6 (1.6)*

8.7 (1.7)*

8.4 (1.5)*

6.8 (1.4)§¶Ŧ

pH

7.37 (0.09)

 

7.45 (0.02)*

7.46 (0.03)*

7.41 (0.03)¶Ŧ

PaCO2 (kPa)

5.0 (0.2)

 

4.3 (0.2)*

4.1 (0.4)*

4.7 (0.4)*¶Ŧ

PaO2 (kPa)

17.2 (1.5)

 

17.9 (1.9)

18.8 (2.3)*

17.4 (1.2)Ŧ

  1. Abbreviations: A Baseline, B Increasing minute ventilation, C Begin moderate hyperventilation with target PaCO2 4–4.7 kPa, D After moderate hyperventilation for 50 min, E Return to baseline, etCO2 End-tidal CO2, MV Minute ventilation (L/min), PaCO2 Partial pressure arterial carbon dioxide (kPa), PaO2 Partial pressure arterial oxygen (kPa)
  2. Data are expressed as mean (SD)
  3. * p < 0.05 compared with A
  4. § p < 0.05 compared with B
  5. p < 0.05 compared with C
  6. Ŧ p < 0.05 compared with D