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Elevated bilirubin and visual perception in pilots.

Hans-Peter Goerres1, Frank Weber

  • 1Division of Clinical Medicine, Department of Neurology, German Air Force Institute of Aviation Medicine, Fuerstenfeldbruck, Germany. hanspetergoerres@bundeswehr.org

Aviation, Space, and Environmental Medicine
|March 26, 2003
PubMed
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Raised serum bilirubin levels in pilots do not impair visual perception. A study found no link between bilirubin levels and performance in pilots with Gilbert's syndrome, indicating safety for aviation.

Area of Science:

  • Aviation Medicine
  • Clinical Physiology
  • Human Factors

Background:

  • A fatal helicopter accident raised concerns about pilot serum bilirubin levels affecting perception.
  • Specifically, bilirubin levels exceeding 20.52 micromol/L were suspected to impair visual perception.

Purpose of the Study:

  • To investigate the impact of elevated serum bilirubin on visual perceptual performance in pilots.
  • To determine if functional hyperbilirubinemia, like Gilbert's syndrome, poses a risk in aviation.

Main Methods:

  • 101 pilots with Gilbert's syndrome underwent perceptual-psychological testing (signal detection test).
  • Testing was conducted during periodic medical examinations at the German Air Force Institute of Aviation Medicine.
  • Results were compared against a control group.

Related Experiment Videos

Main Results:

  • Pilot reaction time and perception range increased with age.
  • These perceptual measures were found to be independent of serum bilirubin levels.
  • No correlation was observed between bilirubin concentration and performance.

Conclusions:

  • The study found no evidence that elevated serum bilirubin levels negatively impact visual perceptual performance.
  • Findings suggest that pilots with functional hyperbilirubinemia, such as Gilbert's syndrome, can safely perform flight duties.
  • This research addresses aviation safety concerns related to bilirubin metabolism.