When using a small-bore catheter with a one-way valve such as a Heimlich valve, how can you determine definitively that there is or is not a small air leak?

Question

Quizplus · Accepted Answer

Connecting the catheter to an underwater seal will allow any air leak to be visually detected through bubbles that form in the water. This is a standard method of verifying that a one-way valve is functioning properly. Listening for air movement or watching the valve may not be reliable methods for detecting small air leaks. Increasing the FIO2 may be used to improve oxygenation, but it will not necessarily reveal the presence of an air leak.

When Using a Small-Bore Catheter with a One-Way Valve Such