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Related Experiment Videos

Relationship between venous bubbles and hemodynamic responses after decompression in pigs

A Vik1, B M Jenssen, O Eftedal

  • 1Section for Extreme Work Environment, Sintef Unimed, Trondheim, Norway.

Undersea & Hyperbaric Medicine : Journal of the Undersea and Hyperbaric Medical Society, Inc
|September 1, 1993
PubMed
Summary

This study introduces a new pig model to investigate venous gas bubbles after decompression. Results show a clear link between bubble count and pulmonary circulation changes, but not systemic circulation changes.

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Area of Science:

  • Physiology
  • Biomedical Engineering
  • Cardiovascular Research

Background:

  • Decompression sickness involves venous gas emboli formation.
  • Understanding the physiological impact of these bubbles is crucial for safety protocols.
  • Existing models may not fully capture the dynamic relationship between bubbles and physiological responses.

Purpose of the Study:

  • To establish and validate a novel pig model for studying venous gas bubbles post-decompression.
  • To investigate the correlation between the quantity of venous gas bubbles and physiological alterations.
  • To differentiate the effects on pulmonary versus systemic circulation.

Main Methods:

  • Anesthetized pigs underwent a controlled decompression protocol.
  • Intravascular bubbles were monitored using transesophageal echocardiography.

Related Experiment Videos

  • Bubble counts in the pulmonary artery quantified venous gas bubble load.
  • Physiological variables of pulmonary and systemic circulations were measured.

    • Main Results:

    • Venous gas bubbles were detected in all pigs post-decompression, with significant inter-individual variability.
    • Changes in pulmonary artery pressure, pulmonary vascular resistance, arterial oxygen tension, and pulmonary shunt fraction correlated with bubble count.
    • No significant correlation was found between bubble count and immediate changes in mean arterial pressure or other systemic variables.

    Conclusions:

    • The developed pig model effectively demonstrates the relationship between venous gas bubbles and physiological changes.
    • Venous gas bubble load is a significant determinant of pulmonary circulation alterations post-decompression.
    • The model highlights a differential impact on pulmonary versus systemic circulation, warranting further investigation.