POIS is listed as a reportable mishap acronym in CH5.

• A. POIS
• B. CO2 Toxicity
• C. AGE
• D. DCS

Answer: (A)

In this context, what’s being tested is recognizing which terms are explicitly identified in CH5 as reportable mishap acronyms. CH5 lists specific acronyms used to categorize and file certain incidents; knowing which ones appear there helps ensure proper reporting.

POIS stands for Pulmonary Over-Inflation Syndrome, a type of pulmonary barotrauma that can occur during ascent. It’s named as a reportable mishap acronym in CH5, so when that kind of incident happens, it’s recorded under that exact acronym in the mishap-reporting system. This designation is what makes it the correct choice.

The other options refer to serious diving injuries, but they’re not the acronyms CH5 designates for reportable mishaps in that section. They’re critical conditions to address and document, but they don’t carry the CH5 reporting acronym in the same way as POIS.