Polycythemia (also known as polycythaemia or polyglobulia) is a disease state in which the proportion of blood volume that is occupied by red blood cells increases. Blood volume proportions can be measured as hematocrit.It can be due to an increase in the number of red blood cells (absolute polycythemia) or to a decrease in the volume of plasma (relative polycythemia).lood volume proportions can be measured as hematocrit. It can be due to an increase in the number of red blood cells (absolute polycythemia) or to a decrease in the volume of plasma (relative polycythemia).
1 Some 20% of adolescents with major depression develop bipolar disorder within five years of the onset of depression. ( 2 Birmaher, B., Childhood and Adolescent Depression: A Review of the Past 10 Years.. 3  Part I, 1995).
Introduction. Bipolar disorder is a chronic disorder that affects approximately one per cent of the world's population, afflicting both males and females. The onset of bipolar disorder usually occurs between 20 to 30 years of age, with a second peak in the mid-40s for women.here is a personality difference between patients with bipolar disorder and those with unipolar depression. Studies have shown that patients with unipolar depression tend to have depressive personalities, even after 15 years' follow up (when patients were no longer sick).