TABLE 3.
Pulmonary function tests
| Original OxyMask
|
Modified OxyMask
|
|||
|---|---|---|---|---|
| Measured | Predicted (%) | Measured | Predicted (%) | |
| Spirometry | ||||
| FVC, L | 1.87±0.66 | 57.38±13.20 | 1.63±0.53 | 52.33±14.06 |
| FEV1, L | 1.22±0.56 | 51.54±21.50 | 0.99±0.54 | 44.75±23.56 |
| FEV1/FVC, % | 65.06±19.29 | – | 59.7±22.5 | – |
| FEF50%, L/s | 1.38±1.23 | 42.15±34.71 | 1.40±1.82 | 46.92±64.92 |
| FEF75%, L/s | 0.40±0.32 | 25.23±18.66 | 0.35±0.34 | 23.33±21.63 |
| Vital capacity, L | 2.00±0.80 | 60.20±15.05 | 1.66±0.58 | 53.89±13.33 |
| ABG (room air) | ||||
| pH | 7.40±0.05 | 7.40±0.04 | ||
| P CO2, mmHg | 47.58±6.07 | 51.08±14.46 | ||
| P O2, mmHg | 52.75±7.56 | 51.83±8.44 | ||
| SaO2, % | 87±6 | 86±7 | ||
| HCO3–, mmol/L | 30.00±4.07 | 31.83±7.49 | ||
Data are presented as means ± SD. There were no significant differences in spirometry or arterial blood gases (ABG) between patients who used the original and those who used the modified OxyMask (Southmedic Inc, Canada). FEF50% Forced expiratory flow at 50% of vital capacity; FEF75% Forced expiratory flow at 75% of vital capacity; FEV1 Forced expiratory volume in 1 s; FVC Forced vital capacity; HCO3– Bicarbonate concentration; PCO2 Partial pressure of carbon dioxide; PO2 Partial pressure of oxygen; SaO2 Blood oxygen saturation