Question:
A 2-year-old child with cyanotic congenital heart disease presents with sudden onset of deep cyanosis and irritability while crying. On evaluation, the child is diagnosed with a hypercyanotic spell. Regarding management and timing of surgery in Tetralogy of Fallot, which of the following is most accurate?
A 2-year-old child with cyanotic congenital heart disease presents with sudden onset of deep cyanosis and irritability while crying. On evaluation, the child is diagnosed with a hypercyanotic spell. Regarding management and timing of surgery in Tetralogy of Fallot, which of the following is most accurate?
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Medical therapy stabilizes acute Tet spells (Knee-chest + Oxygen + Morphine + Phenylephrine/$\beta$-blocker), but spells are a direct indication for timely surgical repair in infancy ($3$--$6\text{ months}$).
Updated On: Sep 3, 2026
- Hypercyanotic spells are treated only surgically
- Children with TOF have a low risk of thrombosis due to cyanosis
- Corrective surgery is done typically around 10 years of age
- Hypercyanotic spells may need surgical indication.
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The Correct Option is D
Solution and Explanation
Concept:
Hypercyanotic ("tet") spells are acute, life-threatening paroxysmal episodes of severe hypoxemia in children with Tetralogy of Fallot (TOF).
They occur due to acute infundibular spasm or a decrease in systemic vascular resistance (SVR), which dramatically increases right-to-left shunting across the non-restrictive VSD.
Explanation:
• Acute medical management of a hypercyanotic spell focuses on increasing SVR, decreasing infundibular spasm, and calming the child (knee-chest position, high-flow oxygen, morphine, IV fluid bolus, $\beta$-blockers like propranolol/esmolol, and systemic vasoconstrictors like phenylephrine).
• The occurrence of even a single hypercyanotic spell indicates severe, unstable dynamic infundibular obstruction and serves as an absolute indication for urgent/early surgical repair or palliative shunt surgery.
• Elective complete surgical repair of TOF is routinely performed in infancy (typically between $3$ and $6$ months of age), not delayed until 10 years of age.
• Chronic hypoxemia triggers secondary erythrocytosis, which substantially increases blood viscosity and elevates the risk of cerebral thromboembolism and brain abscess (especially in the setting of relative iron deficiency).
Final Answer:
The development of hypercyanotic spells represents a major surgical indication for expedited intervention in children with Tetralogy of Fallot.
Hypercyanotic ("tet") spells are acute, life-threatening paroxysmal episodes of severe hypoxemia in children with Tetralogy of Fallot (TOF).
They occur due to acute infundibular spasm or a decrease in systemic vascular resistance (SVR), which dramatically increases right-to-left shunting across the non-restrictive VSD.
Explanation:
• Acute medical management of a hypercyanotic spell focuses on increasing SVR, decreasing infundibular spasm, and calming the child (knee-chest position, high-flow oxygen, morphine, IV fluid bolus, $\beta$-blockers like propranolol/esmolol, and systemic vasoconstrictors like phenylephrine).
• The occurrence of even a single hypercyanotic spell indicates severe, unstable dynamic infundibular obstruction and serves as an absolute indication for urgent/early surgical repair or palliative shunt surgery.
• Elective complete surgical repair of TOF is routinely performed in infancy (typically between $3$ and $6$ months of age), not delayed until 10 years of age.
• Chronic hypoxemia triggers secondary erythrocytosis, which substantially increases blood viscosity and elevates the risk of cerebral thromboembolism and brain abscess (especially in the setting of relative iron deficiency).
Final Answer:
The development of hypercyanotic spells represents a major surgical indication for expedited intervention in children with Tetralogy of Fallot.
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