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

It is difficult to determine whether a Heimlich valve has an ongoing leak unless it is placed to underwater seal. This procedure can be done in the emergency department by placing the Heimlich valve into a cup of water or by placing it in-line with a water-seal chamber to see whether an air leak is continuing after lung expansion.

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