Vygotsky's social account of psychology is comprehensible when viewed in relation to his political views and his early work experience. A brief discussion of this context is therefore in order before explaining the details of his psychological stand- point.
1 Central cyanosis and its causes are all associated with peripheral cyanosis. 2  Decreased pumping of blood by the heart or reduced cardiac output. 3  This is seen in heart failure or circulatory shock. 4  Diseases of circulation like thrombosis or embolism. 5  Constriction of blood vessels of the limbs, fingers and toes.
Cyanosis most often occurs as the result of inadequate amounts of oxygenated hemoglobin -- the molecule which carries oxygen to the body tissues -- or due to hemoglobin abnormalities. This medical condition is characterized by blue colored skin and mucous membranes.yanosis most often occurs as the result of inadequate amounts of oxygenated hemoglobin -- the molecule which carries oxygen to the body tissues -- or due to hemoglobin abnormalities. This medical condition is characterized by blue colored skin and mucous membranes.