Skip to main content

Table 2 Hemodynamic, blood gas, and metabolic parameters during different RRs after achieving adequate intravascular volume

From: Effects of respiratory rate on venous-to-arterial CO2 tension difference in septic shock patients undergoing volume mechanical ventilation

ParametersLevel 1 (RR = 10)Level 2 (RR = 12)Level 3 (RR = 14)Level 4 (RR = 16)
HR, beats/minute95 ± 1998 ± 1797 ± 1797 ± 15
MAP, mmHg84 ± 9.584 ± 10.983 ± 9.886.9 ± 11.7
pH7.35 ± 0.0787.38 ± 0.092*7.42 ± 0.059**7.43 ± 0.078**
PaCO2, mmHg44.9 ± 7.6041.6 ± 6.92**37.2 ± 6.42**33.5 ± 6.80**
PaO2, mmHg114.1 ± 24.96125.0 ± 24.67*137.6 ± 26.86**144.3 ± 27.57**
SaO2,  %98.9 ± 1.1599.1 ± 0.9199.2 ± 0.7499.1 ± 0.90
Lactate, mmol/L1.78 ± 0.951.89 ± 1.291.98 ± 0.722.15 ± 2.06
BE0.59 ± 9.480.42 ± 6.510.70 ± 4.590.84 ± 4.40
K+, mmol/L4.3 ± 0.94.3 ± 0.74.2 ± 0.74.4 ± 0.6
HCO3, mmol/L28.58 ± 5.2226.76 ± 4.56*24.23 ± 4.20*22.44 ± 4.99*
ctCO2, mmol/L56.32 ± 21.952.62 ± 19.7*48.33 ± 19.5**45.21 ± 19.6**
PcvCO2, mmHg50.66 ± 8.0948.61 ± 7.21**45.35 ± 6.99**41.43 ± 12.50**
ScvO2,  %73.1 ± 7.775.3 ± 7.077.1 ± 8.3**75.2 ± 8.7*
gapCO2, mmHg5.76 ± 2.027.19 ± 1.93*8.16 ± 1.81**9.85 ± 1.92**
  1. Data are presented as mean ± SD or absolute values (%)
  2. MAP, mean arterial pressure; PaCO2, partial pressure of carbon dioxide in artery; PcvCO2, central venous carbon dioxide pressure; gapCO2, central venous-to-arterial carbon dioxide difference; ScvO2, central venous oxygen saturation
  3. *P < 0.05 compared with RR of 10 breaths/min, **P < 0.01 compared with RR of 10 breaths/min. Multiple comparisons were used to adjust for the Bonferroni method