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Table 1 Blood gas values and hemodynamic data at different respiratory rates

From: Do fluctuations of PaCO2 impact on the venous-arterial carbon dioxide gradient?

 

Respiratory rate

 

10 breaths/minute

13 breaths/minute

16 breaths/minute

PaCO2 (mmHg)

45.5 ± 9.9

39.7 ± 7.9*

35.9 ± 7.9†‡

ΔCO2 (mmHg)

4.2 ± 1.8

6.6 ± 2.8

7.6 ± 1.7†

pH

7.29 ± 0.06

7.32 ± 0.06*

7.35 ± 0.07†‡

Bicarbonate (mmol/l)

21.2 ± 2.5

20.7 ± 2.5

20 ± 2.5

ΔCO2 ≤6 mmHg, n(%)

10 (100)

4 (40)*

2 (20)†

ScvO2 (%)

77.9 ± 4.1

74.7 ± 7.4

72.6 ± 7.1†

Cardiac index (l/m2)

2.37 ± 0.5

2.36 ± 0.6

2.36 ± 0.6

Mean arterial pressure (mmHg)

71.7 ± 13.3

68 ± 14.5

71.4 ± 13.2

Temperature (°C)

36.9 ± 0.9

36.9 ± 0.9

36.8 ± 0.9

  1. ΔCO2, venous-arterial difference in carbon dioxide tension; PaCO2, arterial partial pressure of carbon dioxide; ScvO2, central venous oxygen saturation. *P <0.05 (respiratory rate 10 vs. 13 breaths/minute), †P <0.05 (respiratory rate 10 vs. 16 breaths/minute), ‡P <0.05 (respiratory rate 13 vs. 16 breaths/minute).
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Critical Care

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