Which of the following symptom sets best describes common signs of Tetralogy of Fallot?

• A. Cyanosis, rapid breathing, feeding issues, poor weight gain, irritability, seizures, weakness.
• B. Fever and rash only.
• C. Cough and wheeze only.
• D. Cyanosis only.

Answer: (A)

Tetralogy of Fallot typically causes chronic hypoxemia from a right-to-left shunt with reduced pulmonary blood flow, so cyanosis is a central and most consistent feature. Along with that, the child often shows rapid breathing as a compensatory response to low oxygen levels, and feeding becomes exhausting, which leads to poor weight gain. Irritability and fatigue are common because daily activities and feeds worsen hypoxemia, and the overall energy for growth and development is affected. Weakness can reflect the fatigued state from breathing and low oxygen delivery. Seizures are not a classic sign, but in severe hypoxic spells cerebral oxygen deprivation can rarely contribute to any transient neurologic symptoms. The combination of cyanosis with respiratory distress and feeding/weight concerns is characteristic, making this set the best description. Other options miss the hallmark cyanosis or combine symptoms that don’t align with the typical TOF presentation.