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Related Experiment Videos

Induction and prevention of acceleration atelectasis.

W A Tacker, U I Balldin, R R Burton

    Aviation, Space, and Environmental Medicine
    |January 1, 1987
    PubMed
    Summary

    Acceleration atelectasis, lung collapse during high G-force exposure, was quantified by vital capacity (VC) reduction. Strategies like breathing lower oxygen concentrations or using anti-G maneuvers effectively reduced this condition.

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    Area of Science:

    • Aerospace Medicine
    • Cardiopulmonary Physiology

    Background:

    • Acceleration atelectasis is lung collapse caused by high G-forces, worsened by 100% oxygen and anti-G suits.
    • Symptoms include chest pain, coughing, and shortness of breath.

    Purpose of the Study:

    • To quantify acceleration atelectasis during simulated aerial combat maneuvers (SACM).
    • To evaluate methods for reducing acceleration atelectasis.

    Main Methods:

    • 12 subjects underwent SACM with 4.5 G or 9 G peak exposures.
    • Vital capacity (VC) reductions were measured to quantify atelectasis.
    • Symptom severity and the effects of interventions were assessed.

    Main Results:

    • VC reductions of 25-28% (labile) and -20% (stable) were observed after SACM.

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  • Symptoms were more severe after 4.5-G than 9-G exposures.
  • Lower oxygen concentrations, positive pressure breathing, and anti-G straining maneuvers (AGSM) reduced atelectasis.

    • Conclusions:

    • Acceleration atelectasis significantly reduces vital capacity and causes symptoms.
    • Diluting inspired oxygen, positive pressure, and AGSM are effective countermeasures against acceleration atelectasis.