Which two factors influence the oxygen concentration delivered by a self-inflating manual resuscitator?

The two factors that influence the oxygen concentration delivered by a self-inflating manual resuscitator are oxygen flow and reservoir size.

Oxygen flow refers to the rate at which oxygen is delivered to the self-inflating bag. If the flow is set too low, there may not be enough oxygen available in the bag to deliver a high concentration to the patient with each breath. Conversely, a higher oxygen flow can ensure that the bag is adequately filled with oxygen, increasing the concentration available for delivery.

The reservoir size is crucial because it determines how much oxygen can be stored for immediate use when the bag is compressed. A larger reservoir can provide a greater quantity of oxygen, thus enabling a higher concentration during inflation. Without a sufficient reservoir, the bag may not maintain the necessary oxygen levels during ventilation efforts.

In contrast, breath patterns and patient age do not directly affect the oxygen concentration from the device, rather they relate to the effectiveness and technique of ventilation. Bag elasticity and mask seal are important for ensuring a proper fit and adequate ventilation, but they do not dictate the concentration of oxygen delivered. Oxygen type and environmental pressure may affect oxygen delivery in different contexts; however, they are not relevant in determining the concentration from a self-inflating manual res