Electrocardiographic findings and abnormalities of respiratory function in chronic nonspecific lung disease

The works of the last decade have reliably established that in pathogenesis of chronic pulmonary heart one of the main places belongs to decrease of pulmonary ventilation and subsequent hypertension of small circulatory system. It has also been established that the increased pressure in the pulmonary artery system is not only the result of pathological process in the pulmonary tissue, leading to its elasticity reduction, disturbance of strength and rupture of interalveolar septa, to connective tissue overgrowth and decreased capacity of the lung vascular channel, but also the result of reflex spasm of small circle vessels due to alveolar ventilation reduction and occurrence of hypoxemia.