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.
Exposure to toxins may damage nerves and cause peripheral neuropathy. 1  Medication toxicity can be caused by many agents in addition to those for fighting cancer. 2  Environmental or industrial toxins such as lead, mercury, and arsenic can cause peripheral neuropathy. 3  Heavy alcohol consumption is a common cause of peripheral neuropathy.