Figure 9From: The AIMAR recommendations for early diagnosis of chronic obstructive respiratory disease based on the WHO/GARD model*Initial prescription and revised prescription of LTOT. EA, Environmental air. (†) if the patient desaturates during exercise, in some studies, an improvement of exercise tolerance has been shown; without any effect on survival. From[36]. (*) in the presence of pulmonary hypertension, pulmonary heart, pitting edema, erythrocytosis (hematocrit < 55%), cognitive deficit. From[35].Back to article page