[Longitudinal study of parameters of respiratory function tests and blood gas analysis in patients with progressive systemic scleroderma].
The longitudinal study encloses 53 patients with PSS followed up for a period of 6 years. The most frequent changes in the parameters of pulmonary function are: diffusing capacity impairment--reduction in DICO (86.8% of the patients), restrictive lung disease pattern (50.9% of the patients) and arterial hypoxemia (43.4% of the patients). The duration of PSS and the follow up period do not cause significant changes in the pulmonary function parameters and the arterial blood-gas analysis in the group of patients studied.