Table 2.
Effects of cannula placement on physiological parameters
| V̇i, l/min | f, breaths/min | Vt, l/breath | PaCO2, Torr | PaO2, Torr | |
|---|---|---|---|---|---|
| RPTN | |||||
| Preimplant | 7.60 ± 0.98 | 20.68 ± 2.83 | 0.40 ± 0.02 | 39.1 ± 1.0 | 97 ± 5 |
| Postimplant | 6.47 ± 0.67* | 19.46 ± 2.06 | 0.38 ± 0.03* | 39.8 ± 1.6 | 91 ± 6 |
| Post-Atr MD | 6.48 ± 0.23* | 21.34 ± 1.98 | 0.36 ± 0.02* | 40.1 ± 1.7 | 97 ± 5 |
| LPBN | |||||
| Preimplant | 8.59 ± 1.25 | 16.56 ± 0.60 | 0.53 ± 0.07 | 39.6 ± 0.4 | 104 ± 11 |
| Postimplant | 6.76 ± 1.18* | 19.77 ± 1.60 | 0.38 ± 0.07* | 40.3 ± 1.5 | 92 ± 11 |
| Post-Atr MD | 6.67 ± 0.30* | 17.85 ± 1.72 | 0.42 ± 0.04* | 41.3 ± 0.7 | 97 ± 3 |
| MPBN | |||||
| Preimplant | 6.27 ± 0.43 | 16.47 ± 0.90 | 0.40 ± 0.04 | 41.6 ± 0.7 | 101 ± 4 |
| Postimplant | 6.39 ± 0.60 | 18.63 ± 1.46 | 0.35 ± 0.02* | 43.1 ± 1.8 | 92 ± 6 |
| Post-Atr MD | 6.31 ± 0.58 | 19.11 ± 0.98 | 0.34 ± 0.02* | 43.8 ± 1.8 | 102 ± 6 |
| KFN | |||||
| Preimplant | 7.79 ± 0.78 | 17.84 ± 1.16 | 0.46 ± 0.04 | 41.2 ± 0.7 | 97 ± 4 |
| Postimplant | 6.77 ± 0.30* | 17.93 ± 1.06 | 0.40 ± 0.02* | 39.7 ± 0.4 | 92 ± 2 |
| Post-Atr MD | 6.85 ± 0.36* | 16.16 ± 1.23 | 0.47 ± 0.04 | 39.9 ± 0.6 | 101 ± 3 |
After implantation of the cannula, pulmonary ventilation (V̇i) was significantly reduced from preimplantation studies, and these effects were generally due to a reduction in tidal volume (Vt).
*
P < 0.05, significant differences from preimplantation studies. Breathing frequency (f) and arterial blood gases (PaCO2, PaO2) were not significantly (P > 0.05) changed by implantation of the cannula.