Table 3.
HME performance indicators and ventilatory parameters | Laboratory – in vivo t0 | Laboratory – in vivo t1 | Laboratory – in vivo t2 | Laboratory values [15, 16, 19, 20] |
---|---|---|---|---|
Load T (°C) | + 3.4 | + 3.7 | + 3.7 | 37.0 |
(p < 0.01) | (p < 0.01) | (p < 0.01) | ||
| ||||
Load AH (mg/l) | + 6.9 | + 7.4 | + 7.6 | 43.8 |
(p < 0.01) | (p < 0.01) | (p < 0.01) | ||
| ||||
Return T (efficacy) (°C) | + 0.8 | + 1.2 | + 1.3 | 32.3 |
(p < 0.01) | (p < 0.01) | (p < 0.01) | ||
| ||||
Return AH (efficacy) (mg/l) | + 1.3 | + 2.0 | + 2.2 | 33.6 |
(p < 0.01) | (p < 0.01) | (p < 0.01) | ||
| ||||
Thermal differential (efficiency) (°C) | + 2.5 | + 2.5 | + 2.4 | 4.7 |
(p < 0.01) | (p < 0.01) | (p < 0.01) | ||
| ||||
AH yield (efficiency) | - 0.12 | - 0.12 | - 0.12 | 0.77 |
(p < 0.01) | (p < 0.01) | (p < 0.01) | ||
| ||||
Input T (°C) | - 2.9 | - 2.2 | - 2.5 | 23.0 |
(p < 0.01) | (p < 0.01) | (p < 0.01) | ||
| ||||
Input AH (mg/l) | - 0.2 | - 0.3 | - 0.2 | 1.0 |
(p = 0.03) | (p < 0.01) | (p = 0.049) | ||
| ||||
Loss T (°C) | - 3.0 | - 2.3 | - 2.5 | 23.0 |
(p < 0.01) | (p < 0.01) | (p < 0.01) | ||
| ||||
Loss AH (mg/l) | - 0.3 | - 0.9 | - 0.6 | 6.0 |
(p = 0.10) | (p <0.01) | (p =0.16) | ||
| ||||
Tidal volume (ml) | + 57 | + 69 | + 75 | 500 |
(p < 0.01) | (p < 0.01) | (p < 0.01) | ||
| ||||
Respiratory rate (min−1) | - 3 | - 3 | - 3 | 15 |
(p < 0.01) | (p < 0.01) | (p < 0.01) | ||
| ||||
Minute ventilation (l/min) | + 0.04 | - 0.02 | + 0.08 | 7.5 |
(p = 0.91) | (p = 0.96) | (p = 0.84) | ||
| ||||
I:E ratio | + 0.47 | + 0.41 | + 0.42 | 1 |
(p < 0.01) | (p < 0.01) | (p < 0.01) | ||
| ||||
Room temperature (°C) | - 1.0 | - 0.3 | - 0.7 | 23.0 |
(p < 0.01) | (p = 0.63) | (p < 0.01) | ||
| ||||
Patient temperature (°C) | + 0.4 | + 0.1 | + 0.3 | 37.0 |
(p < 0.01) | (p = 0.12) | (p < 0.01) |