The nurse explained how to position an infant with tetralogy of Fallot if the infant suddenly becomes cyanotic. Which statement by the father leads the nurse to determine he understood the instructions?

Choice A reason: Laying the infant with the head lower than the body worsens cyanosis in tetralogy of Fallot by reducing systemic venous return. The knee-to-chest position increases resistance, improving oxygenation, making this incorrect, as it indicates a need for further teaching on proper positioning. Choice B reason: Holding the infant against the shoulder with knees bent up toward the chest is the correct knee-to-chest position for tetralogy of Fallot during cyanosis. This increases systemic vascular resistance, reducing right-to-left shunting and improving oxygenation, indicating the father’s understanding of the instructions. Choice C reason: Placing the infant upright in an infant seat does not effectively increase systemic vascular resistance to reduce shunting in tetralogy of Fallot. The knee-to-chest position is required, making this incorrect, as it shows a need for teaching on the correct positioning to manage cyanosis. Choice D reason: Supine position with head elevated does not address cyanosis in tetralogy of Fallot, as it fails to increase systemic resistance to reduce shunting. Knee-to-chest positioning is needed, making this incorrect, as it indicates misunderstanding of the proper technique to improve oxygenation.