Pulmonary hypertension – a fairly common condition, which is to diagnose, especially in the early stages of development, and very difficult to treat. Since pulmonary hypertension encountered in their practice every physician, and often the pediatrician. Pulmonary hypertension (LH) is defined as an increase in the average pressure in the pulmonary artery (LA) more than 25 mm Hg. Art. at rest or more than 30 mm Hg. Art. under load. There are currently over one hundred known diseases, which develops LH, secondary in these cases, ie, the main complication of the disease. Known essential and LH, which remained unknown reason. According to the recommendations of WHO (1961), this disease is known as
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