Comparison between the ventilation values prescribed and those set on the control panel of the ventilator
| Variable | Mean (SD) value prescribed | Mean (SD)difference | Difference Limits of agreement | Difference Actual range |
|---|---|---|---|---|
| V˙e, minute ventilation; f, frequency; I/E, inspiratory/expiratory time; Pins, inspiratory pressure; Pexp, expiratory pressure. | ||||
| V˙e, f and I/E were measured in the 153 patients on volume preset ventilators; Pins and Pexp were measured in the 137 patients on pressure preset ventilators. | ||||
| V˙e (l/min) | 11.09 (2.53) | −0.12 (1.38) | −2.88/2.64 | −5.00/6.40 |
| p = 0.298 | ||||
| f (cycles/min) | 17.99 (2.66) | 0.02 (1.30) | −2.58/2.62 | −4.00/12.00 |
| p = 0.854 | ||||
| I/E | 0.85 (0.15) | −0.00 (0.19) | −0.38/0.38 | −0.48/0.37 |
| p = 0.822 | ||||
| Pins (cm H2O) | 17.57 (3.05) | −0.23 (1.52) | −2.77/2.32 | −4.00/6.00 |
| p = 0.079 | ||||
| Pexp (cm H2O) | 5.10 (1.76) | −0.32 (0.89) | −2.10/1.46 | −4.00/4.00 |
| p<0.001 | ||||