In every neonate presented with cyanosis and shock, congenital heart disease dependent on patency ductus arteriosus should be considered. The physiologic constriction of ductus arteriosus after birth in a neonate whose pulmonary blood flow or aortic blood flow is dependent on PDA leads to shock and collapse in the neonate. Infusion of prostaglan in such a neonate is life-saving and keeps patency ductus arteriosus. Treatment of underlying causes of peripheral cyanosis such as tamponade or cardiogenic shock  due to low cardiac output state and peripheral vasoconstriction lead to disappearing of cyanosis.
Cyanosis medical therapy
Cyanosis secondary prevention
Cyanosis primary prevention
Methemoglobinemia medical therapy
Lead poisoning medical therapy
Acute liver failure medical therapy
Metabolic acidosis medical therapy
Diabetic coma medical therapy