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

The oxygen concentration delivered by a self-inflating manual resuscitator is primarily influenced by the oxygen flow and reservoir size.

Oxygen flow is crucial because it determines how much oxygen is delivered to the patient when the bag is squeezed. If the flow rate is low, there may not be enough oxygen available to fill the reservoir and subsequently be delivered during ventilation, leading to a lower concentration of oxygen in the breaths provided. Conversely, a higher oxygen flow rate ensures that the bag can adequately supply oxygen to the patient with each squeeze.

The reservoir size also plays a significant role since it holds the oxygen that will be delivered to the patient. A larger reservoir allows for a greater volume of oxygen to be stored, which can be delivered to the patient, increasing the concentration of oxygen available during ventilation. If the reservoir is too small or empty, the concentration of oxygen delivered will be compromised as the bag may not effectively replace the oxygen being used with each breath.

In contrast, the factors of oxygen pressure and bag volume do not directly influence the concentration of oxygen delivered, as they pertain more to the equipment's mechanics rather than the actual concentration delivered to the patient. Similarly, the ventilation rate and mask fit can affect the effectiveness of ventilation but do not