Pediatrics In a child with tetralogy of Fallot with fever and diarrhea, which of the following is the surest sign of a cyanotic spell? A Hepatomegaly B Absence of murmur C S3 gallop rhythm D Aerial oxygen saturation of less than 75% 💡 Explanation In a child with tetralogy of Fallot with fever and diarrhea, which of the following is the surest sign of a cyanotic spell? ✓ Correct Answer: B. Absence of murmur