blue spell

An episode of hypoxia, cyanosis, dyspnoea, restlessness and syncope with acutely decreased arterial PO2 and decrease of already compromised pulmonary blood flow, seen in Fallot’s tetralogy, but also in other cyanotic congenital heart malformations

blue spell

Pediatrics An episode of hypoxia, cyanosis, dyspnea, restlessness and syncope with acutely ↓ arterial PO2 and ↓ of already compromised pulmonary blood flow, seen in Fallot's tetralogy, but also in other cyanotic congenital heart malformations. See Shunts–right-to-left.