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).
Of the children with rapid mood swings and high energy, another 12 percent (75 children) had a form of bipolar disorder that includes much shorter manic episodes. Compared to children without rapid mood swings and high energy, those with these symptoms:1  Reported more symptoms of depression, anxiety, manic symptoms, and symptoms of ADHD. 2  Had lower functioning at home, school, or with peers.ome researchers suggest that this is how maniaâan important component of bipolar disorderâappears in children. How mania and bipolar disorder are defined in children is important because rapid mood swings and high energy are common among youth.