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Haemoconcentration in neurological decompression illness

A Boussuges1, P Blanc, F Molenat

  • 1Service de Réanimation Médicale et d'Hyperbarie, Hôpital salvator, Marseilles, France.

International Journal of Sports Medicine
|July 1, 1996
PubMed
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High hematocrit levels in sport divers with neurological decompression illness (DCI) correlate with persistent symptoms. A hematocrit of 48% or higher indicates a poor prognosis for neurological recovery after DCI.

Area of Science:

  • Diving Medicine
  • Physiology
  • Neurology

Background:

  • Decompression illness (DCI) results from bubble formation due to reduced ambient pressure.
  • Bubbles cause capillary leak syndrome, plasma extravasation, and hemoconcentration, which animal models link to poor prognosis.
  • Hemoconcentration, indicated by hematocrit levels, is a potential prognostic factor in DCI.

Purpose of the Study:

  • To investigate the relationship between hematocrit levels and neurological outcomes in sport divers with DCI.
  • To determine if hematocrit levels can predict persistent neurological sequelae after DCI.

Main Methods:

  • Hematocrit levels were measured in 58 sport divers with neurological DCI and 16 control divers.
  • Hematocrit values were compared between divers with DCI and controls.

Related Experiment Videos

  • Hematocrit levels were analyzed for correlation with neurological sequelae at one month post-accident.

    • Main Results:

    • No significant difference in hematocrit was found between divers with neurological DCI and controls.
    • Divers with neurological sequelae had significantly higher median hematocrit levels compared to controls and divers without sequelae.
    • A hematocrit level of 48% or higher was correlated with persistent neurological sequelae one month after DCI.

    Conclusions:

    • Elevated hematocrit levels are associated with persistent neurological deficits following DCI in sport divers.
    • A hematocrit threshold of 48% may serve as a prognostic indicator for neurological recovery after DCI.
    • Hematocrit levels below 48% did not have prognostic value for neurological outcomes in this cohort.