Table 3.
Current Oxygen Requirements and Ventilation Characteristics (n=569)
| Current daytime oxygen, n (%) | 318 (55.9%) |
| Flow rate (L/min), median [1Q-3Q] | 1.0 [1.0–2.0] |
| Current nighttime oxygen, n (%) | 385 (67.7%) |
| Flow rate (L/min), median [1Q-3Q] | 2.0 [1.0–2.0] |
| Ventilator mode, n (%) | |
| Bi-level spontaneous/timed | 525 (92.3%) |
| Bi-level + target volume ventilation | 19 (3.3%) |
| Bi-level spontaneous | 18 (3.2%) |
| Bi-level + target volume ventilation+ auto EPAP | 6 (1.0%) |
| Bi-level timed | 1 (0.2%) |
| Predominant interface, n (%) | |
| Oro-nasal mask | 522 (91.7%) |
| Nasal mask | 42 (7.4%) |
| Total face mask | 3 (0.5%) |
| Nasal pillows | 2 (0.4%) |
| Tracheostomy | 0 (0%) |
| Ventilator parameters, median [1Q-3Q] | |
| IPAP (cmH2O) | 19.0 [16.0–22.0] |
| EPAP (cmH2O) | 6.5 [6.0–8.0] |
| BURR (bpm) (n=506) | 15 [14–16] |
| Volume (assured) mL (n=25) | 550.0 [465.0–562.5] |
| Humidifier, n (%) | 224 (39.4%) |
| Ventilator usage, median [1Q-3Q] | 8.0 [7.0 −10.0] |
| ≥ 5h/day, n (%) | 526 (92.4%) |
| ≥12h/day, n (%) | 58 (10.2%) |
| Current PaCO2 (mmHg), median [1Q-3Q] | 45.0 [42.0–50.0] |
| ≤48 mmHg, n (%) | 388 (68.2%) |
| ≤45 mmHg, n (%) | 291 (51.1%) |
| Current HCO3 (mmol/L), median [1Q-3Q] | 28.0 [27.0–31.0] |
Abbreviations: IPAP, inspiratory positive airway pressure; EPAP, expiratory positive airway pressure; BURR, back up respiratory rate; HMV, home mechanical ventilation; PaCO2, arterial partial pressure of carbon dioxide; HCO3, serum bicarbonate.