When using reservoir masks, inflate the bag by placing a finger over which valve before placing the mask on the patient?

When using reservoir masks, inflate the bag by placing a finger over which valve before placing the mask on the patient?

• A. Exhalation valve
• B. Inhalation valve
• C. Reservoir valve
• D. Ventilation valve

Answer: (B)

To ensure the reservoir bag is ready with oxygen, you want to fill it before placing the mask on the patient. The inhalation path is the route that feeds gas from the source into the reservoir and then toward the patient during inhalation. By placing a finger over the inhalation valve, you momentarily block that path, forcing the oxygen flow to push into the reservoir bag and inflate it. Once the bag is full, you remove your finger and place the mask on the patient, so inhalation draws from that prefilled reservoir while exhaled air exits through the appropriate port. Covering other valves wouldn’t reliably inflate the bag and could disrupt proper function of the mask system.

To ensure the reservoir bag is ready with oxygen, you want to fill it before placing the mask on the patient. The inhalation path is the route that feeds gas from the source into the reservoir and then toward the patient during inhalation. By placing a finger over the inhalation valve, you momentarily block that path, forcing the oxygen flow to push into the reservoir bag and inflate it. Once the bag is full, you remove your finger and place the mask on the patient, so inhalation draws from that prefilled reservoir while exhaled air exits through the appropriate port. Covering other valves wouldn’t reliably inflate the bag and could disrupt proper function of the mask system.