HYPOXIC ERYTHROCYTOSIS
The article presents a brief review of literature which shows the characteristic of bronchopulmonary and cardiovascular diseases that most often cause secondary absolute hypoxic erythrocytosis. The information about pathogenesis of blood changes at this nosology is given. The principles of differential diagnosis between secondary absolute hypoxic erythrocytosis and chronic myeloproliferative diseases, i.e. polycythemia vera and idiopathic myelofibrosis in erythremia stage are set. As an example three clinical cases of personal experience of the authors are given: 1) the patient who developed hypoxic erythrocytosis against chronic pulmonary heart disease formed due to a combination of COPD and Pickwick syndrome and "sleep apnea"; 2) the patient admitted to hospital initially only in connection with changes in the blood (erythrocytosis) for differential diagnosis and who was revealed to have arteriovenous malformation of the lung vessels; 3) the case of primary pulmonary hypertension diagnosis in a young patient with multiple comorbidities.