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

Table 5 Variables associated with noninvasive ventilation success or failure.

	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
LOS_ICU	13 (4 to 22)	16 (8 to 23)
LOS_HOSPITAL	16 (4 to 27)	19 (12 to 32)

LOS_ICU, Length of stay at the ICU, in days; LOS_HOSPITAL, 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.

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