The severity of dyspnoea was confronted to the value of the partial pressure of arterial oxygen at rest in a group of 51 patients with chronic non-specific pneumopathy associated to medium or severe ventilatory obstruction (VEMS under 1,5 I). The patients have been classified as "predominantly bronchitic" or "predominantly emphysematous" on the basis of clinical, radiological and biological criteria. In the group as a whole there was no relation between the partial pressure of arterial oxygen and the severity of the dyspnoea. The analysis of sub-groups evidenced a tendency to decrease of the oxygen pressure with accentuation of dyspnoea in the "bronchitis" group, although the coefficient value of this inverse correlation did not reach the treshold of statistical significance (r = -0,46; p greater than 0,05).
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