In the case of an adolescent in respiratory distress requiring oxygen at 40% via Venturi mask, what flow rate should be set?

To determine the appropriate flow rate for delivering 40% oxygen via a Venturi mask, it is essential to understand how a Venturi mask works. A Venturi mask utilizes a flow of oxygen to create a specific concentration of oxygen that can be delivered to the patient. Different color-coded attachments on the mask correspond to specific oxygen concentrations and flow rates.

When using a Venturi mask for 40% oxygen, the setup is designed to provide a specific flow rate that matches the concentration required. In this case, the flow rate for 40% oxygen via Venturi mask is typically set at 8 liters per minute. This flow rate ensures that the oxygen mixes properly with room air and delivers the desired concentration effectively while preventing the risk of CO2 retention.

Using 8 L/min is significant for ensuring that the patient receives the correct amount of oxygen without causing discomfort or adverse effects. Other flow rates would not provide the appropriate concentration of oxygen needed, potentially leading to inadequate oxygen delivery or excessive oxygen levels in the bloodstream.