Cyanosis is a condition in which the skin appears to have a blue tint. It occurs in areas where the blood in surface blood vessels has lower levels of oxygen. It can be a sign of a medical emergency.

Bluish skin discoloration (cyanosis) may affect your hands, feet, or entire body. Possible causes include heart, lung, and circulatory conditions, some of which are life threatening. Many conditions ...

Fallot’s Tetralogy: Also known as tetralogy of Fallot (TOF), it is a rare cardiac condition caused by a combination of four heart defects that are present at birth. Methemoglobin: An abnormal form of ...