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Table 2 Dead space and its parameters in post-cardiac surgery patients and patients with acute respiratory distress syndrome calculated with different methods

From: Assessment of dead-space ventilation in patients with acute respiratory distress syndrome: a prospective observational study

  Post-cardiac surgery (n = 15) ARDS (n = 15)
  Enghoff-DBag Enghoff-InCal Bohr-VCap Enghoff-VCap Enghoff-DBag Enghoff-InCal Bohr-VCap Enghoff-VCap
PACO2, kPa 4.3 ± 0.6 3.9 ± 0.8  
PaCO2, kPa 5.2 ± 0.5 5.2 ± 0.5 5.2 ± 0.5 6.9 ± 1.7 6.9 ± 1.7 6.9 ± 1.7
PeCO2, kPa 2.7 ± 0.2 3.8 ± 0.5a 2.6 ± 0.4 2.6 ± 0.4 2.2 ± 0.4 2.3 ± 0.7 2.1 ± 0.5 2.1 ± 0.5
VD/VT, % 49 ± 4 26 ± 9b 38 ± 5c 50 ± 4 67 ± 9 66 ± 10 45 ± 7d 68 ± 9
  1. PACO 2 mean alveolar carbon dioxide tension, PaCO 2 arterial carbon dioxide tension, PeCO 2 mixed expired carbon dioxide tension, V D /V T dead-space fraction, DBag Douglas bag, InCal indirect calorimetry, VCap volumetric capnography
  2. Within-group testing: P < 0.05 for aEnghoff-InCal vs. Enghoff-DBag, Bohr-VCap, Enghoff-VCap; bBohr-VCap vs. Enghoff-DBag, Enghoff-InCal, Enghoff-VCap; cEnghoff-InCal vs. Enghoff-DBag, Bohr-VCap, Enghoff-VCap; dBohr-VCap vs. Enghoff-DBag, Enghoff-InCal, Enghoff-VCap