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The Journal of Thoracic and Cardiovascular Surgery, Vol 103, 773-780, Copyright © 1992 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association

ARTICLES

In a canine model, lung preservation at 10 degrees C is superior to that at 4 degrees C. A comparison of two preservation temperatures on lung function and on adenosine triphosphate level measured by phosphorus 31-nuclear magnetic resonance

H Date, O Lima, A Matsumura, H Tsuji, DA d'Avignon and JD Cooper
Department of Surgery, Washington University School of Medicine, St. Louis, Mo.

Techniques for organ preservation generally use hypothermia to retard metabolic requirements. However, excessive hypothermia may also produce injury. Using a canine left lung allotransplantation procedure, we compared two preservation temperatures (4 degrees and 10 degrees C) in terms of subsequent lung function measured by temporary occlusion of the right pulmonary artery after implantation of the preserved left donor lung. The lungs were flushed with low-potassium dextran electrolyte solution, inflated with 100% oxygen, and preserved for 18 hours. To investigate possible changes of energy stores at different temperatures, we performed phosphorus 31-nuclear magnetic resonance analyses of lung samples. Sequential determinations of adenosine triphosphate levels in lung tissue preserved at 4 degrees, 10 degrees, and 22 degrees C were studied. After transplantation, lungs preserved at 10 degrees C (n = 6) provided significantly better arterial oxygen tension than those preserved at 4 degrees C (n = 6), 451 +/- 46 mm Hg versus 243 +/- 86 mm Hg (p less than 0.05), and lower pulmonary vascular resistance, 581 +/- 68 dynes.sec.cm-5 versus 1006 +/- 157 dynes.sec.cm-5 (p less than 0.05). Adenosine triphosphate levels at 4 degrees and 10 degrees C were stable and did not differ from each other at the end of the 18-hour preservation period: 0.86 +/- 0.04 mumol/gm wet weight for control versus 0.86 +/- 0.07 mumol/gm wet weight for 4 degrees C and 0.93 +/- 0.06 mumol/gm wet weight for 10 degrees C after 18 hours of preservation. Preservation at 22 degrees C caused a 28% depression of adenosine triphosphate after 18 hours of preservation. These results lead us to conclude the following: (1) Optimal temperature for lung preservation is in the vicinity of 10 degrees C, and (2) lung dysfunction caused by excessive hypothermia is not due to a failure to maintain adenosine triphosphate levels. We suspect that adenosine triphosphate is generated by oxidative phosphorylation during lung preservation.

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