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Table 1 Effects of Circuit Flushing and ASPIDS at increasing respiratory rate

From: Re-inspiration of CO2 from ventilator circuit: effects of circuit flushing and aspiration of dead space up to high respiratory rate

RESPIRATORY
RATE
  MV,
Lit.
VT,
ml
Pplat,
cmH2O
Cst,
ml/cmH20
V'CO2
ml/min
PaCO2,
kPa
pH PaO2,
kPa
HR,
b/min
MAP,
mmHg
RR20 Baseline 4.1 ± 0.6 208 ± 31 14 ± 2.6 20 ± 3 133 ± 10 5.3 ± 0.2 7.47 ± 0.04 12.3 ± 1.2 74 ± 20 84 ± 17
  After 30 minutes of Circuit Flushing 4.1 ± 0.6 208 ± 31 14 ± 3.5    4.7 ± 0.4 * 7.51 ± 0.04 * 12.6 ± 1.2 78 ± 20 ** 83 ± 15
RR40 Baseline 4.9 ± 0.5 130 ± 13 13 ± 3.7 15 ± 4 142 ± 20 5.9 ± 0.4 # 7.43 ± 0.04 10.7 ± 0.9 79 ± 15 81 ± 12
  After 30 minutes of Circuit Flushing 4.9 ± 0.5 130 ± 13 14 ± 3.5 **    4.7 ± 0.3 ** 7.51 ± 0.04 ** 12 ± 1.5 81 ± 13 80 ± 9
  After 30 minutes of Circuit Flushing + ASPIDS 4.9 ± 0.5 130 ± 13 13 ± 3.6    3.9 ± 0.2 * 7.58 ± 0.05 ** 12 ± 1.8 84 ± 11 79 ± 10
RR60 Baseline 5.9 ± 0.5 101 ± 9.5 13 ± 2.2 12 ± 2 136 ± 16 6.3 ± 0.4 # 7.40 ± 0.05 9.6 ± 1.3 84 ± 9 81 ± 9
  After 30 minutes of Circuit Flushing 5.9 ± 0.5 101 ± 9.5 14 ± 2    4.6 ± 0.6 ** 7.51 ± 0.07 * 11.5 ± 2 * 91 ± 20 83 ± 9
  After 30 minutes of Circuit Flushing + ASPIDS 5.9 ± 0.5 101 ± 9.5 12 ± 2 **    3.7 ± 0.5 ** 7.59 ± 0.07 ** 11.2 ± 2.8 94 ± 22 79 ± 11
  1. * P < 0.01; ** P < 0.001 (comparison were made to the preceding value). # P <0.05 (comparison between baseline at RR40 and 60 vs baseline at RR20, and between baseline at RR60 vs baseline at RR40). ASPIDS, aspiration of dead space; Cst, static compliance; HR, heart rate; MAP, mean arterial pressure; MV, minute ventilation; PaCO2, carbon dioxide arterial partial pressure; PaO2, oxygen arterial partial pressure; Pplat, plateau pressure; RR, respiratory rate; VT, tidal volume; V'CO2, carbon dioxide production.