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Pulmonary endothelial cell function after modified Eurocollins solution infusion

H Unruh1

  • 1Department of Surgery, Faculty of Medicine, University of Manitoba, Winnipeg, Canada.

The Journal of Heart and Lung Transplantation : the Official Publication of the International Society for Heart Transplantation
|July 1, 1993
PubMed
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Eurocollins solution does not increase pulmonary endothelial permeability, preventing edema. However, it may reduce enzyme function by decreasing intravascular surface area.

Area of Science:

  • Cardiovascular Medicine
  • Pulmonary Medicine
  • Transplantation Biology

Background:

  • Eurocollins solution is widely used for lung preservation before transplantation.
  • It is known to increase perfusion pressure costs via vascular obstruction and tone.
  • Potential direct effects on pulmonary endothelial cells require investigation.

Purpose of the Study:

  • To determine if Eurocollins solution directly increases pulmonary endothelial permeability.
  • To assess the impact of Eurocollins solution on endothelial metabolic integrity.
  • To evaluate effects on transvascular fluid flux and angiotensin-converting enzyme (ACE) function.

Main Methods:

  • Assessed transvascular fluid flux using microvascular filtration coefficient and critical capillary pressure.

Related Experiment Videos

  • Measured angiotensin-converting enzyme (ACE) activity using an inert substrate ([3H]BPAP).
  • Evaluated the effect of cold Eurocollins solution on endothelial permeability and ACE function.

    • Main Results:

    • Eurocollins solution did not alter microvascular filtration coefficient or critical capillary pressure, indicating no increased permeability.
    • Peak and average metabolism of the ACE substrate remained high (82-83%) before and after perfusion.
    • The first-order enzyme rate constant (Vmax/Km) for ACE was reduced by 22% after Eurocollins solution perfusion.

    Conclusions:

    • Eurocollins solution does not induce pulmonary edema through increased endothelial permeability.
    • A reduction in the ACE enzyme's rate constant suggests impaired function, possibly due to reduced intravascular surface area.
    • Findings clarify the mechanism of Eurocollins solution's effect on lung vasculature during transplantation preparation.