Paediatric Cardiology & Nephrology · NEET PG Preparation Paediatrics
A 4-year-old child with Tetralogy of Fallot suddenly becomes extremely cyanotic, agitated, and hyperpneic while crying, followed by limpness and sync…
Practice question from Paediatric Cardiology & Nephrology (NEET PG Preparation Paediatrics), with the correct answer and a step-by-step solution.
medium · MCQ · Q-F1E72B
A 4-year-old child with Tetralogy of Fallot suddenly becomes extremely cyanotic, agitated, and hyperpneic while crying, followed by limpness and syncopal episode. The mother notices that the child instinctively squats on the floor. Which of the following hemodynamic changes best explains the beneficial effect of squatting in this condition?
- A.Decrease in systemic vascular resistance
- B.Increase in systemic vascular resistanceCorrect answer
- C.Increase in pulmonary vascular resistance
- D.Decrease in heart rate
Solution
Squatting increases Systemic Vascular Resistance (SVR), which decreases the right-to-left shunt across the ventricular septal defect in Tetralogy of Fallot, thereby increasing pulmonary blood flow and improving arterial oxygen saturation during a hypercyanotic ('tet') spell.
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