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Table 1 Comparison of arterial blood gas analysis from the central venous and arterial line in supine position

From: Platypnea–orthodeoxia syndrome in a postoperative patient: a case report

 

Central venous line (superior vena cava)

Arterial line (left radial)

pH

7.44

7.47

Oxygen saturation (%)

94

91.5

Partial pressure O2 (mmHg)

66.6

57.9

Partial pressure CO2 (mmHg)

35.5

32.7

Fraction of inspired O2 (%)

40

40

  1. Alveolar-arterial gradient O2: (150 − 1.25 × 32.7) − 57.9 = 51.25