Final answer:
The most appropriate device to deliver a stable and precise FIO2 for an infant with unrepaired tetralogy of Fallot is the Venturi mask, which can provide a specific oxygen concentration crucial for managing this condition.
Step-by-step explanation:
The question asks for the appropriate oxygen delivery device for an infant with unrepaired tetralogy of Fallot who has been ordered oxygen at 28%. The correct device to ensure stable FIO2 delivery for the infant is c) Venturi mask. The Venturi mask is specifically designed to deliver a precise amount of oxygen by mixing it with the incoming air. It can provide a fixed and predictable FIO2, which is essential in managing the oxygen therapy for a condition like tetralogy of Fallot, where maintaining appropriate oxygen saturation levels is critical.
In this scenario, the Nasal cannula and High-flow nasal cannula could provide variable amounts of FIO2, making them less suitable for the precise oxygen delivery needed in this case. A Simple mask would also be less precise than a Venturi mask. Therefore, the Venturi mask is the most suitable option for stable oxygen delivery.