When a boy with Tetralogy of Fallot suddenly becomes cyanotic, what is the recommended action?

When a boy with Tetralogy of Fallot suddenly becomes cyanotic, what is the recommended action?

• A. Place him in a semi-Fowler's position in an infant seat.
• B. Lie him supine with the head turned to one side.
• C. Lie him prone, being sure he can breathe easily.
• D. Place him in a knee-chest position.

Answer: (D)

The recommended action for a boy with Tetralogy of Fallot who suddenly becomes cyanotic is to place him in a knee-chest position. This position helps to increase systemic vascular resistance, which can improve blood flow to the lungs by reducing the right-to-left shunting of blood that occurs during episodes of cyanosis. By bringing the knees up towards the chest, this maneuver effectively increases venous return to the heart and enhances the pressure in the systemic circulation, aiding in the re-routing of blood to the pulmonary circulation for oxygenation. In contrast, other positions may not provide the same therapeutic benefits. Placing the child in a semi-Fowler's position or lying supine may not help alleviate cyanosis effectively, as these positions do not significantly impact the hemodynamic changes necessary to improve oxygenation. Additionally, lying prone can hinder breathing and does not facilitate the increased vascular resistance needed during a cyanotic spell. The knee-chest position is specific to addressing the acute physiological changes associated with Tetralogy of Fallot, underscoring its importance in a crisis situation.

The recommended action for a boy with Tetralogy of Fallot who suddenly becomes cyanotic is to place him in a knee-chest position. This position helps to increase systemic vascular resistance, which can improve blood flow to the lungs by reducing the right-to-left shunting of blood that occurs during episodes of cyanosis. By bringing the knees up towards the chest, this maneuver effectively increases venous return to the heart and enhances the pressure in the systemic circulation, aiding in the re-routing of blood to the pulmonary circulation for oxygenation.

In contrast, other positions may not provide the same therapeutic benefits. Placing the child in a semi-Fowler's position or lying supine may not help alleviate cyanosis effectively, as these positions do not significantly impact the hemodynamic changes necessary to improve oxygenation. Additionally, lying prone can hinder breathing and does not facilitate the increased vascular resistance needed during a cyanotic spell. The knee-chest position is specific to addressing the acute physiological changes associated with Tetralogy of Fallot, underscoring its importance in a crisis situation.