A pulse of 125 BPM with no identifiable cause should trigger which action?

• A. Observe and recheck later
• B. Administer medication
• C. Contact flight surgeon
• D. Call emergency services

Answer: (C)

A rapid heart rate with no clear cause is a red flag for aviation medical safety, because it can signal an underlying condition that could impair performance or endanger flight. In Coast Guard aviation, the appropriate step is to involve the aviation medical authority—the flight surgeon—who can assess whether the tachycardia is due to a benign, temporary factor or something that needs immediate investigation or grounding.

Letting it go or waiting to see if it resolves on its own risks missing a treatable or more serious issue, such as dehydration, fever, anemia, electrolyte imbalance, or a cardiac problem. Administering medication without a diagnosis can mask symptoms or provoke adverse effects, potentially compromising safety. The flight surgeon will determine the necessary evaluation—clinical exam, tests, or imaging—and advise whether to continue flying or to seek further medical clearance before resuming duties.