Initial and secondary assessment prior to referral to specialist unit
| Initial assessment | Second assessment | |
| Echocardiography | ||
| EF % | 45 | 50 |
| TR grade | II | II |
| Ppa mmHg | 45 | 70 |
| Lung function | ||
| FVC % pred | 85 | 85 |
| FEV1 % pred | 78 | 72 |
| FEV1/FVC % | 69 | 69 |
| PEF % pred | 46 | 66 |
| Pa,O2 mmHg | 54.1 | 57.5 |
| Pa,CO2 mmHg | 30.9 | 30.6 |
| pH | 7.42 | 7.41 |
| O2 % | 88 | 89 |
EF: ejection fraction; TR: tricuspid regurgitation; Ppa: pulmonary artery pressure; FVC: forced vital capacity; % pred: % predicted; FEV1: forced expiratory volume in 1 s; PEF: peak expiratory flow; Pa,O2: arterial oxygen tension; Pa,CO2: arterial carbon dioxide tension.