In which situation is a flow-inflating bag preferred for use?

A flow-inflating bag is particularly advantageous when the goal is to administer free-flow oxygen to an infant. This type of bag allows the provider to deliver a continuous flow of oxygen while ensuring that the bag remains inflated, which maximizes the oxygen delivery to the infant's lungs.

Flow-inflating bags can help maintain a proper positive pressure during the administration of oxygen and often support higher concentrations of oxygen than a self-expanding bag. When free-flowing oxygen is needed, the flow-inflating bag can use a variable flow of oxygen to achieve desired concentrations, while also allowing for the ability to assist with ventilation if required.

In contrast, the other situations mentioned do not align as well with the primary use of a flow-inflating bag. For example, while high tidal volumes and high pressures may be goals in certain circumstances, these needs can often be met through different equipment or techniques that are more suited for those specific requirements. Additionally, the flow-inflating bag typically requires a gas source to function effectively, which makes it less ideal for situations where no gas source is available.