Comparison between ventilator values actually measured and set on the control panel of the ventilator
| Variable | Mean (SD) value set in ventilator | 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) | 11.22 (2.74) | −0.47 (1.31) | −3.09/2.15 | −3.65/6.05 |
| p<0.001 | ||||
| f (cycles/min) | 18.01 (2.52) | 0.07 (0.66) | −1.25/1.39 | −2.83/3.75 |
| p = 0.160 | ||||
| I/E | 0.84 (0.17) | −0.04 (0.11) | −0.26/0.18 | −0.37/0.52 |
| p<0.001 | ||||
| Pins (cm H2O) | 17.47 (3.27) | 1.71 (1.95) | −2.19/5.61 | −1.66/9.98 |
| p<0.001 | ||||
| Pexp (cm H2O) | 4.72 (1.64) | 0.12 (0.87) | −1.62/1.86 | −3.49/2.69 |
| p = 0.110 | ||||