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Table 1 Table

From: Pulmonary function indices in spontaneously breathing subjects

  Venturi mask Large nasal catheter
  O2 % O2/atm l/min
  24 28 40 0/15 3/12 7.5/7.5 10/5 15/0 30/0
ρO2 (A-a)(kPa) 3.42 3.68 6.00 3.46 4.49 9.83 6.29 11.32 13.92
ρO2 (a/A) 0.82 0.83 0.83 0.79 0.83 0.78 0.87 0.82 0.83
ρO2 [(A-a)/a] 0.22 0.21 0.22 0.28 0.23 0.33 0.15 0.22 0.21
ρO2 (a)/PO2 (I) 62 62 68 59 64 65 70 71 72
Pshunt 0.02 0.04 0.03 0.04 0.05 0.06 0.06 0.06 0.07
  1. The ρO2 (ET-a) is increasing with increasing O2, flow. The highest ρO2 (ET-a) value (13.92 kPa) is observed when O2 is supplied via the Large nasal catheter. The pulmonary indices were all within the normal range.