What effect does a reservoir bag have when attached to a manual resuscitator?

When a reservoir bag is attached to a manual resuscitator, it serves an important purpose in enhancing the effectiveness of oxygen delivery. The correct answer indicates that the presence of the reservoir bag increases the fractional inspired oxygen concentration (Fio2 concentration). This is because the reservoir bag provides a larger volume of oxygen that can be delivered to the patient with each squeeze of the bag.

When the bag fills up, it allows for a more consistent and concentrated supply of oxygen during positive pressure ventilation. This is particularly critical in situations where high levels of oxygen are needed, such as in cases of respiratory distress or hypoxia.

In contrast, without a reservoir bag, the same resuscitator may not be able to deliver as concentrated an oxygen supply, as the volume directly available for each breath can be limited. This is vital for effective resuscitation and patient outcomes, especially in emergencies.

The enhancements offered by the reservoir bag, including the ability to increase Fio2 concentration, significantly improve the manual resuscitator’s functionality in delivering high-flow, supplemental oxygen effectively.