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Amnesia01:13

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Amnesia is a condition marked by long-term memory loss, which impairs the ability to recall past events or create new memories.
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Transient global amnesia and its aeromedical implications.

Tania Jagathesan1, Michael D O'Brien

  • 1United Kingdom Civil Aviation Authority, Gatwick Airport, West Sussex RH6 0YR, UK. tania.jagathesan@caa.co.uk

Aviation, Space, and Environmental Medicine
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Summary

Transient global amnesia (TGA) in pilots is a significant concern for aviation safety. This study reviews UK Civil Aviation Authority data, finding TGA episodes are brief and pilots can often return to flying after assessment.

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Area of Science:

  • Aeromedical research
  • Neurology

Background:

  • Transient global amnesia (TGA) causes sudden, temporary memory loss, impacting pilot fitness to fly.
  • TGA episodes are characterized by disorientation in time and place, with preserved person recognition.

Purpose of the Study:

  • To examine the UK Civil Aviation Authority's (UK CAA) experience with pilots diagnosed with TGA.
  • To compare UK CAA data on TGA in pilots with existing medical literature.

Main Methods:

  • A search of the UK CAA medical records database for pilots with TGA history (1990-2010).
  • Recording of subject demographics, episode frequency/duration, follow-up, precipitants, and associated conditions.
  • Literature review of similar studies.

Main Results:

  • 29 pilots with TGA history were identified (28 male, 1 female, mean age 59).
  • Average TGA episode duration was 2.8 hours; mean follow-up was 3.4 years.
  • Common precipitants included activity, stress, and cold water exposure; 21% had a history of migraine, 34% of hypertension.

Conclusions:

  • The study considers aeromedical implications of TGA, including etiology, associations, misdiagnosis, and recurrence.
  • A proposed policy for certifying pilots after TGA is presented.