[Roentgenopneumopolygraphy in the diagnosis of lung cancer].

Studies on the pulmonary respiration function in lung cancer patients by roentgenopneumopolygraphy allowed determining some reduction in the level of the lung parenchyma ventilatory activity on average up to 0.20 +/- 0.02 unit of optic density. In peripheral lung cancer the reduction in lung functioning was on average up to 0.30 UOD. As a whole, this index in lung cancer patients compared with normal was reduced by 0.40 UOD. Moreover, increasing of the lung surface area was noted during inspiration and expiration with the corresponding decrease of pulmonary distension. A coefficient of respiratory chest expansion reached on average 82 +/- 2.54%. Roentgenopneumopolygrams showed distinctly the symptom of mediastinal organs displacement to the site of pathology, thus indicating bronchostenosis. Also, a leveling of optic density of expiratory and inspiratory bands on the side of affection was, noted. Thus, roentgenopneumopolygraphy as a functional method of investigation makes it possible to reveal precisely enough the symptoms of partial bronchial obturation, atelectasis, distension of the lung as well as to determine the degree of gravity of the lesion concerned.