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The Journal of Thoracic and Cardiovascular Surgery, Vol 102, 666-672, Copyright © 1991 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association

ARTICLES

Prolonged hypothermic cardiac storage with University of Wisconsin solution. An assessment with human cell cultures

SE Fremes, RK Li, RD Weisel, DA Mickle and LC Tumiati
Division of Cardiovascular Surgery and Clinical Biochemistry, University of Toronto, Ontario, Canada.

Hypothermic storage of cardiac allografts is routinely used for transplantation but is associated with an increased mortality when ischemic times are greater than 4 hours. The ideal storage conditions (solution and temperature) could extend the current limits of cold ischemia. Human endothelial cells and ventricular myocytes were studied to screen various solutions and temperatures for organ preservation. Four solutions (modified Euro-Collins, phosphate-buffered saline, Stanford cardioplegia, and University of Wisconsin) were evaluated. Endothelial cells were evaluated after prolonged hypothermic storage consisting of 0 degree, 4 degrees, and 8 degrees C for 36 hours, and ventricular myocytes were stored at 0 degree and 8 degrees C for 24 hours. Cell viability was determined by morphology (10 dishes per group), and trypan blue exclusion (5 dishes per group) in addition to a cell adhesion assay (endothelial cells 5 dishes per group) and adenine nucleotide analysis with high-performance liquid chromatography techniques (ventricular myocytes 5 dishes per group). Endothelial cell morphology was best preserved by University of Wisconsin solution (p less than 0.001, chi 2) and at 0 degree C (p less than 0.01, chi 2). Endothelial cells stored with University of Wisconsin solution excluded trypan blue better (1.0% +/- 0.5% cells stained, p less than 0.001. Analysis of variance [ANOVA]). Cell adhesion was poorly protected with Stanford cardioplegia (p less than 0.001, ANOVA). Myocyte morphology was preserved best with University of Wisconsin solution at 0 degree C (p less than 0.001, chi 2). According to trypan blue staining, Euro- Collins and University of Wisconsin solutions were superior to Stanford cardioplegia or phosphate-buffered solutions (p less than 0.001, ANOVA). Temperature did not influence the trypan blue results. Adenosine triphosphate was maintained best with University of Wisconsin solution at 0 degree C (p less than 0.01, ANOVA). Myocytes were more sensitive to the effects of prolonged storage compared with endothelial cells by morphologic criteria and trypan blue staining characteristics, irrespective of the shorter preservation times. University of Wisconsin solution was the most effective solution tested. Colder temperatures (0 degree to 4 degrees C) provided better protection than 8 degrees C. Myocytes were more sensitive to prolonged preservation than endothelial cells. Furthermore, the technique used appears helpful as a model of prolonged hypothermic storage and could be expanded to assess other interventions.

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