Table 2.
Comparison of ventilation parameters in two time-separated burn intensive care unit cohorts
| Parameter | 2005/06 cohort | 2010/2011 cohort | P-value |
|---|---|---|---|
| Ventilator rate (breaths·min−1) | 17.2 (15.1–19.4) | 17.7 (16.0–19.3) | 0.747 |
| Spontaneous rate (breaths·min−1) | 17.2 (12.2–22.2) | 17.0 (13.0–21.0) | 0.944 |
| Ventilator tidal volume (ml/kg) | 8.32 (7.67–9.10) | 7.96 (6.30–9.62) | 0.624 |
| Spontaneous tidal volume (ml/kg) | 8.45 (6.69–10.2) | 8.45 (6.63–10.3) | 0.995 |
| Minute volume (L·min−1) | 11.9 (9.28–14.1) | 10.3 (8.17–12.5) | 0.373 |
| Inspiratory pressure* (kPa) | 2.78 (2.21–3.35) | 2.74 (2.31–3.16) | 0.884 |
| ASB† pressure (kPa) | 1.60 (1.21–1.98) | 1.20 (1.08–1.31) | 0.034 |
| Peak airway pressure* (kPa) | 2.52 (2.14–2.90) | 2.63 (2.00–2.73) | 0.518 |
| Positive end expiratory pressure (kPa) | 0.70 (0.59–0.81) | 0.75 (0.65–0.86) | 0.479 |
| Inspired O2 concentration (%) | 46.9 (37.4–56.2) | 40.2 (35.1–45.3) | 0.184 |
Values are mean (95% confidence interval): P-value calculated with two-tailed t-test. *Inspiratory pressure applies during pressure controlled ventilation mode only. Peak airway pressure applies during volume controlled and spontaneous ventilation modes only. †ASB = Assisted spontaneous breathing.