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Blood cell changes in asymptomatic divers

E E Barnard, P K Weathersby

    Undersea Biomedical Research
    |December 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    This study found mild, short-term changes in blood cell counts after simulated diving, even without decompression sickness symptoms. These subtle shifts in red cells, white cells, and platelets were too small to confirm significant decompression damage.

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    Area of Science:

    • Physiology
    • Hematology
    • Diving Medicine

    Background:

    • Recent research suggests diving and decompression may alter blood cells without causing overt decompression sickness.
    • Understanding subclinical blood cell changes is crucial for assessing diving risks.

    Purpose of the Study:

    • To investigate subclinical hematological changes following a standard dive profile.
    • To determine if mild alterations in blood cell parameters occur post-decompression.

    Main Methods:

    • Ten healthy individuals underwent a simulated dive to 100 fsw (30.5 msw) for 60 minutes.
    • Standard U.S. Navy decompression procedures were followed.
    • Blood samples were collected over three weeks and analyzed for red blood cells, white blood cells, reticulocytes, platelets (using three methods), and platelet size distribution.

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    Main Results:

    • Small, statistically significant decreases were observed in red blood cells, white blood cells, and hematocrit.
    • Platelet counts showed decreases via microscopic methods, but not automated counters.
    • An increase in the proportion of larger platelets was noted post-dive.
    • No subjects exhibited symptoms of clinical decompression sickness.

    Conclusions:

    • The study detected mild, transient hematological alterations after simulated diving and decompression.
    • These observed changes were insufficient to support proposed mechanisms of decompression-induced cellular damage.
    • Further research may be needed to fully elucidate the long-term or subtle effects of diving on blood parameters.