Heartsaver First Aid Part I Progress Indicator: Question 3 of 22 3.  You are providing supplemental oxygen to a patient.  A bystander notices the oxygen cylinder lying next to the patient's bed and stands the tank upright, explaining that it provides better oxygen flow from the tank through the regulator.  Which of the following is your next most important action? Choices: Agree with and thank the bystander. Return the cylinder to a flat position for safety. Shake the tank to stir the oxygen to increase flow rate. Use rope or chain to secure the tank to the furniture.