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.
Other causes of paresthesias related to disorders of the peripheral nerves include: 1  Metabolic or nutritional disturbances. 2  Trauma. 3  Inflammation. 4  Connective tissue disease. 5  Toxins. 6  Malignancy. 7  Infections. 8  Hereditary disease.