Information on the functional condition of external respiration in 101 patients with angiographically demonstrated coronary sclerosis is analysed. Definite connections between the findings of coronarography and the values of external respiration were found, which were indicative of increase in the ratio of the residual pulmonary volume to the total pulmonary capacity and of a relative hyperventilation of the lungs in the contingent examined. The discrepancy between ventilation of the lungs and their perfusion was more marked in patients with a greater number of stenosed coronary arteries. Shortening of the absolute values and the absence of an increase in the duration of repeated apnoea were evidence of insufficient resistance to hypercapnia and hypoxia during apnoea.
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