Table 2 |
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|
Non-invasive positive pressure ventilation parameters |
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|
NIPPV failure (n = 38) |
NIPPV success (n = 16) |
p value |
|
|
|
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|
Initial mode of ventilation |
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|
Bi-level NIPPV |
21 |
8 |
0.72 |
|
CPAP |
172 |
84 |
|
|
Respiratory rate (initial; breaths/minute) |
31 (24–39) |
23 (21–34) |
0.13 |
|
Tidal volume (ml; n = 27) |
640 (493–700) |
435 (384–558) |
0.03 |
|
Minute ventilation (l/minute; n = 27) |
17.2 (12–27) |
12.5 (8–14) |
0.02 |
|
Tidal volume (ml/kg predicted body weight; n = 27) |
9 (7.5–11) |
8.4 (6.4–10.4) |
0.34 |
|
IPAP (cmH2O; n = 29) |
12 (10–16) |
13 (12–15) |
0.53 |
|
EPAP or CPAP (cmH2O; n = 43) |
5 (5–7.5) |
5.5 (5–8) |
0.92 |
|
Decrease in respiratory rate after NIPPVa |
13 (34%) |
9 (56%) |
0.24 |
|
Improvement in arterial blood gas PaO2/FiO2 after the NIPPVb |
7 (18%) |
6 (38%) |
0.17 |
|
|
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|
aRespiratory rate <30 and a 10% decrease from before the non-invasive positive pressure ventilation (NIPPV) institution. bImprovement in PaO2/FiO2 >10 units after the start of NIPPV (within one hour). Patients who were intubated before the follow up blood gas measurement were considered not to have improvement. APACHE, Acute physiology and chronic health evaluation; CPAP, continuous positive airway pressure; EPAP, expiratory positive airway pressure; IPAP, inspiratory positive airway pressure. PaO2/FiO2, ratio of arterial partial pressure of O2 and inspired O2 concentration; |
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Rana et al. Critical Care 2006 10:R79 doi:10.1186/cc4923 |
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