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.
Neurological causes may be due to disease, toxicity, or injury to one or more nerves. 1  Focal nerve injury causes paralysis of the muscle supplied by that nerve. Peripheral neuropathy is seen in conditions like: 2  Amyotrophic lateral sclerosis. 3  Bellâs palsy. 4  Vitamin B12 deficiency. 5  Diphtheria. 6  Heavy metal poisoning. 7  Snake bite.