Patient characteristics according to the level of disease on computed tomography pulmonary angiography
| Level 1 | Level 2 | Level 3 | Level 4 | p-value | |
| Patients | 20 | 54 | 23 | 3 | |
| Female | 9 (45) | 23 (43) | 19 (83) | 1 (33) | 0.01 |
| Age years | 60±16 | 57±13 | 59±17 | 42±16 | 0.2 |
| Functional class | 2.8±0.8 | 2.7±0.7 | 3.0±0.5 | 3.0±0.0 | 0.3 |
| 6MWD m | 319±147 | 420±161 | 327±114 | 475±99 | 0.01 |
| BNP pg·mL−1 | 460±508 | 190±299 | 243±383 | 49±66 | 0.04 |
| Mean PAP mmHg | 48±15 | 41±12 | 45±12 | 33±13 | 0.08 |
| Systolic PAP mmHg | 79±21 | 68±20 | 74±23 | 55±22 | 0.1 |
| Diastolic PAP mmHg | 30±12 | 25±8 | 26±8 | 20±9 | 0.1 |
| RAP mmHg | 11±6 | 10±4 | 11±5 | 5±2 | 0.2 |
| PCWP mmHg | 12±3 | 12±4 | 10±4 | 7±2 | 0.03 |
| Cardiac index L·min·m−2 | 1.8±0.5 | 2.1±0.5 | 2.4±0.7 | 2.5±0.3 | 0.001 |
| PVR dyn·s·cm−5 | 1029±556 | 611±335 | 731±387 | 458±241 | 0.001 |
| Pre-operative echo RV size | 0.9 | ||||
| Normal | 2 | 11 | 5 | 1 | |
| Mild | 2 | 10 | 4 | 1 | |
| Moderate | 5 | 14 | 5 | 0 | |
| Severe | 9 | 15 | 8 | 1 | |
| Pre-operative echo RV function | 0.7 | ||||
| Normal | 4 | 18 | 5 | 1 | |
| Mild | 3 | 9 | 2 | 0 | |
| Moderate | 6 | 15 | 11 | 2 | |
| Severe | 4 | 7 | 4 | 0 | |
| Pre-operative PH therapy | 3 (15) | 9 (17) | 9 (39) | 2 (67) | 0.04 |
Data are presented as n, n (%) or mean±sd, unless otherwise stated. 6MWD: 6-min walk distance; BNP: brain natriuretic peptide; PAP: pulmonary arterial pressure; RAP: right atrial pressure; PCWP: pulmonary capillary wedge pressure; CI: cardiac index; PVR: pulmonary vascular resistance; echo: echocardiogram; RV: right ventricular; PH: pulmonary hypertension.