Pulmonary haemodynamics in coal workers' pneumoconiosis and non-pneumoconiotic patients with chronic obstructive airways disease.

The pulmonary haemodynamics of 22 patients with advanced forms of coal workers' pneumoconiosis (CWP) and chronic obstructive airways disease (COAD), and 24 patients with advanced forms of COAD without pneumoconiosis were studied. The results obtained permitted a haemodynamic distinction between these two groups of patients. The differences, at rest and during 25 W exercise, are discussed.