Clinical and haemodynamic characteristics of 20 patients with primary pulmonary hypertension
| NYHA, New York Heart Association functional class. | |
| Age (years) | 39 (14) |
| Women (n) | 16 |
| Duration of symptoms (months) | 44 (26) |
| NYHA class I–II (n) | 7 |
| NYHA class III–IV | 13 |
| Right ventricular failure (n) | 6 |
| Mean pulmonary artery pressure (mm Hg) | 63 (20) |
| Cardiac output (l/min) | 3.3 (1.1) |
| Stroke volume (ml) | 39.4 (14.4) |
| Right ventricular stroke work index (g.m/m2) | 16.1 (5.9) |
| Total pulmonary resistance (dyn.s.cm−5) | 1829 (962) |
| Mean right atrial pressure (mm Hg) | 9 (5) |
| Systemic oxygen saturation (%) | 92.5 (3.3) |