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Pulmonary microembolization in experimental aortic surgery.

K R Poskitt1, J T Irwin, I F Lane

  • 1Department of Surgery, Charing Cross Hospital, London, UK.

The British Journal of Surgery
|December 1, 1988
PubMed
Summary
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Major aortic surgery in pigs caused shock and lung dysfunction. Platelet accumulation in the lungs during shock suggests microembolization contributes to post-operative pulmonary dysfunction.

Area of Science:

  • Cardiovascular Surgery
  • Pulmonary Medicine
  • Hematology

Background:

  • Post-surgical pulmonary dysfunction, often termed "shock lung", is a common complication.
  • Understanding the mechanisms behind this dysfunction is crucial for improving patient outcomes.

Purpose of the Study:

  • To investigate the role of platelet kinetics in the development of pulmonary dysfunction following aortic surgery.
  • To establish a porcine model for studying shock and its pulmonary consequences.

Main Methods:

  • A standardized porcine model of aortic surgery was utilized.
  • 111In-labelled platelet kinetics were monitored in relation to pulmonary function.
  • Measurements included cardiac output, platelet and leukocyte counts, and alveolar-arterial oxygen difference.

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Main Results:

  • Aortic surgery induced reproducible shock, leading to a 50% mortality rate within 3 days.
  • Significant reductions in cardiac output, platelet, and leukocyte counts were observed.
  • Pulmonary platelet accumulation and increased pulmonary vascular resistance correlated with worsening gas exchange (increased alveolar-arterial oxygen difference).

Conclusions:

  • The study suggests that pulmonary platelet microembolization occurs during surgical shock.
  • This microembolization is a likely contributor to the subsequent pulmonary dysfunction observed after major aortic surgery.