Table 3 Changes in patients' tolerance to ventilation
All patients | Optimized ventilation | Standard ventilation | P | |
|---|---|---|---|---|
At the beginning of NIV | ||||
Tolerance to ventilation | 1.5 ± .7 | 1.5 ± .7 | 1.5 ± .6 | .928 |
Inspiratory difficulty | 7.2 ± 1.9 | 7.2 ± 2.2 | 7.2 ± 1.6 | 1.000 |
Expiratory difficulty | 7.2 ± 2.0 | 7.1 ± 1.9 | 7.3 ± 2.1 | .735 |
After 30 minutes of NIV | ||||
Tolerance to ventilation | 2.6 ± .9 | 2.7 ± .8 | 2.6 ± .9 | .663 |
Inspiratory difficulty | 5.4 ± 1.3 | 5.2 ± 2.2 | 5.6 ± 2.0 | .555 |
Expiratory difficulty | 5.6 ± 2.0 | 5.3 ± 2.1 | 5.9 ± 1.8 | .304 |
Pts Alarm activation*, n | 2.2 ± 3.1 | 1.9 ± 1.7 | 2.5 ± 1.9 | .416 |
After 2 hours of NIV | ||||
Tolerance to ventilation | 2.3 ± 8 | 2.6 ± .7 | 1.9 ± .9 | .001 |
Inspiratory difficulty | 4.9 ± 1.9 | 4.7 ± 1.9 | 5.0 ± 1.9 | .494 |
Expiratory difficulty | 4.8 ± 2.0 | 4.8 ± 2.0 | 4.9 ± 2.0 | .875 |
Pts Alarm activation*, n | 1.9 ± 2.8 | 1.0 ± 1.9 | 3.3 ± 3.2 | .004 |
After 6 hours of NIV | ||||
Tolerance to ventilation | 3.5 ± .8 | 3.7 ± .7 | 3.3 ± .9 | .092 |
Inspiratory difficulty | 4.0 ± 2.1 | 3.7 ± 2.1 | 4.2 ± 2.2 | .442 |
Expiratory difficulty | 3.9 ± 2.1 | 3.5 ± 2.0 | 4.4 ± 2.2 | .124 |
Pts Alarm activation*, n | 2.3 ± 2.8 | 1.1 ± 1.8 | 3.4 ± 3.2 | .015 |
After 24 hours of NIV | ||||
Tolerance to ventilation | 3.8 ± 1.0 | 3.8 ± 1.0 | 3.8 ± 1.0 | .921 |
Inspiratory difficulty | 3.1 ± 2.1 | 3.0 ± 2.2 | 3.2 ± 2.1 | .791 |
Expiratory difficulty | 3.2 ± 2.3 | 3.1 ± 2.5 | 3.4 ± 2.1 | .657 |
Pts Alarm activation*, n | 2.3 ± 3.0 | 1.1 ± 1.8 | 3.4 ± 3.2 | .387 |