Table 1.

Clinical and haemodynamic characteristics of 20 patients with primary pulmonary hypertension

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)

NYHA, New York Heart Association functional class.