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Related Experiment Videos

Pulmonary physiology during pulmonary embolism.

C G Elliott1

  • 1Pulmonary Division, LDS Hospital, Salt Lake City, UT 84143.

Chest
|April 1, 1992
PubMed
Summary

Acute pulmonary thromboembolism significantly increases pulmonary vascular resistance and impairs gas exchange. Thrombolytic therapy offers a faster and potentially sustained improvement in these hemodynamic and functional derangements compared to anticoagulation.

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Area of Science:

  • Cardiopulmonary Physiology
  • Vascular Medicine
  • Pulmonary Embolism Pathophysiology

Background:

  • Acute pulmonary thromboembolism (PE) causes significant pulmonary function derangements.
  • Increased pulmonary vascular resistance (PVR) is a primary alteration in acute PE.
  • Vascular obstruction, vasoconstriction, ventilation-perfusion mismatch, and shunting contribute to PE pathophysiology.

Purpose of the Study:

  • To detail the pathophysiologic consequences of acute pulmonary thromboembolism.
  • To compare the efficacy of thrombolytic therapy versus anticoagulant therapy in reversing PE-induced derangements.

Main Methods:

  • Review of pathophysiologic alterations in acute pulmonary thromboembolism.
  • Analysis of hemodynamic and functional changes.
  • Comparison of therapeutic outcomes between thrombolytic and anticoagulant agents.

Main Results:

  • Acute PE leads to increased PVR, ventilation-perfusion mismatch (dead space and venous admixture), and potential shunting.
  • Abnormalities in gas exchange (carbon monoxide transfer), compliance, airway resistance, and ventilatory control are observed.
  • Thrombolytic therapy rapidly reverses hemodynamic derangements; limited data suggest sustained benefits on PVR and gas exchange.

Conclusions:

  • Acute PE causes multifaceted pulmonary dysfunction, primarily elevated PVR and impaired gas exchange.
  • Thrombolytic therapy demonstrates faster hemodynamic improvement than anticoagulation for acute PE.
  • Further research is needed to confirm sustained benefits of thrombolytic treatment in acute pulmonary embolism.

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