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 Symptoms, Causes of Blue Lips, Toes, Fingers, Tongue. Cyanosis is a sign of low oxygen levels in the blood (hypoxemia). As defined under what is cyanosis, it is a consequence of a high concentration of deoxygenated hemoglobin (greater than 5 g/dL or 50 g/L) in the arterial blood, usually with a oxygen saturation of less than 90%.