The reservoir bag is emptying during a sedation procedure

The reservoir bag is emptying (going flat) during a sedation procedure with the patient breathing normally and the r a machine set at a flowrate of 6 L/min total. We are using the Porter brown breathing system.

As the the Porter brown double mask has a superior fit against the patient's face, it effectively means that most of the fresh gas flow is inhaled. With the old style single mask there is often an improper fit which allows room air to be entrained during breaths.

Ensure that the inner liner flutter valve membrane is in place and not damaged. Set the correct scavenging flow with nasal mask in place on patient. Commence the r a session with the bag inflated (but not overinflated) and ensure patient is not breathing too rapidly or taking abnormal breaths.

Inspect all rubber goods e.g. reservoir bag, tubings to ensure they are not holed or damaged. Note: The outlet non-return valve on the r a flowmeter is set to produce a bias to direct some of the titrated fresh gas flow into the reservoir bag. If the problem continues, ask your service provider for advice.