Table 4.
Characteristics of patients receiving non-invasive ventilation on admission, and comparison to those receiving invasive ventilation
| NIV (n = 49) | Non-NIV (n = 129) | P | |
|---|---|---|---|
| Proportion of the entire population | 28% | 72% | |
| Age (years) | 40 ± 16 | 44 ± 15 | 0.26 |
| Gender (male) | 25 (51%) | 73 (57%) | 0.51 |
| APACHE II | 16 ± 6 | 19 ± 7 | 0.01 |
| PaO2/FIO2 day0 | 129 (70 to 173) | 141 (92 to 217) | 0.12 |
| PCO2 day0 | 42 (37 to 55) | 42 (34 to 51) | 0.23 |
| COPD999 | 6/49 (12%) | 22/129 (17%) | 0.24 |
| Asthma | 2/49 (4%) | 8/129 (6%) | 0.58 |
| CHF | 1/49 (2%) | 9/129 (7%) | 0.20 |
| Pregnancy | 5/48 (10%) | 11/128 (9%) | 0.71 |
| Immunosupression | 3/49 (6%) | 26/129 (20%) | 0.03 |
| Obesity1 | 12/49 (24%) | 34/129 (26%) | 0.80 |
| Hospital mortality | 19 (39%) | 66 (51%) | 0.14 |
| Total duration of mechanical ventilation (days)2 | 12 (6 to 21) | 10 (6 to 16)] | 0.15 |
| LOSICU | 15 (8 to 25) | 11 (7 to 17) | 0.06 |
| LOSHOSPITAL | 19 (11 to 25) | 16 (8 to 23) | 0.06 |
CHF, chronic heart failure; COPD, chronic obstructive pulmonary disease; LOSICU, length of stay at the ICU, in days; LOSHOSPITAL, length of stay at the hospital, in days; NIV, non-invasive ventilation
1 Obesity was defined as a BMI > 30
2 Refers to the sum of the duration of NIV plus the duration of invasive ventilation.