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Table 5 Variables associated with noninvasive ventilation success or failure.

From: Lung Function and Organ Dysfunctions in 178 Patients Requiring Mechanical Ventilation During The 2009 Influenza A (H1N1) Pandemic

  NIV success (n= 3) NIV failure (n= 46)
Prior duration of symptoms (days) 3.6 ± 1.1 7.2 ± 3.8
Age 25 ± 10 42 ± 16
APACHE II 8 ± 3 17 ± 5
PaO2/FIO2 225 ± 115 140 ± 96
FIO2 0.35 ± 0.21 0.80 ± 0.22
Arterial pH 7.40 ± 0.03 7.31 ± 0.10
PaCO2 39 ± 2.5 46 ± 14
SOFA 2.6 ± 2 5.1 ± 2.7
LOSICU 13 (4 to 22) 16 (8 to 23)
LOSHOSPITAL 16 (4 to 27) 19 (12 to 32)
  1. LOSICU, Length of stay at the ICU, in days; LOSHOSPITAL, Length of stay at the hospital, in days; NIV, non-invasive ventilation. Due to the small number of patients that did not require intubation and mechanical ventilation (n = 3), statistical analysis was not performed.