Table 2

Laboratory results

Laboratory testsNMeanSDNumber of cases outside normal parameters*(%)
Blood gas analysis upon admission
 pH537.30.422 (41.5)
 Pco25332.48.840 (75.5)
 Po25349.924.253 (100)
 Sao25071.721.339 (78)
Blood gas analysis before intubation
 pH417.30.122 (53.7)
 Pco24034.28.922 (57.9)
 Po24241.314.441 (97.6)
 Sao24163.1521.2637 (90.2)
Blood gas analysis after intubation
 pH638.16.142 (67.7)
 Pco26342.321.832 (59.3)
 Po26369.079.656 (88.9)
 Sao26278.3519.0439 (62.9)
  • Pco2, partial pressure of blood carbon dioxide; Po2, partial pressure of blood oxygen; Sao2, blood saturation of oxygen.

  • * Normal parameters: pH 7.35–7.45; Po2 80–100 mm Hg; Pco2 35–45 mm Hg; Sao2 90–100%.