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Ann Thorac Surg 1995;60:1376-1381
© 1995 The Society of Thoracic Surgeons

Original Articles: General Thoracic

Free Radical–Mediated Vascular Injury in Lungs Preserved at Moderate Hypothermia

Masayuki Haniuda, MD, Carolyn M. Dresler, MD, Takatoshi Mizuta, MD, Joel D. Cooper, MD, G. Alexander Patterson, MD

Division of Cardiothoracic Surgery, Department of Surgery, Washington University School of Medicine, St. Louis, Missouri

Accepted for publication June 22, 1995.

Background. Early allograft dysfunction remains a frequently encountered problem in clinical lung transplantation. Lung ischemia-reperfusion injury is associated with increased vascular permeability, which may be due in part to oxygen (O2) free radicals. However, it is not clear whether O2 free radicals are produced during ischemia under storage conditions in clinical lung transplantation.

Methods. Using an isolated ex vivo rabbit lung model, we studied the effects of preservation temperature on pulmonary capillary filtration coefficient (Kf) and lipid peroxidation in rabbit lungs inflated with 100% O2 after preservation with or without the O2 free radical scavenger dimethylthiourea. New Zealand white rabbits weighing 2.7 to 3.1 kg were intubated and ventilated with room air or 100% O2 (tidal volume = 25 mL). After heparinization and sternotomy, the pulmonary artery was flushed with low-potassium–dextran–1% glucose solution (200 mL). The heart-lung block was excised, submerged, and stored for 24 hours at 1° or 10°C. After 24-hour preservation, the heart-lung block was suspended from a strain-gauge force transducer and ventilated with room air. The pulmonary artery cannula was connected to a reservoir of hetastarch solution. The lungs were flushed briefly with the hetastarch solution, and the reservoir was raised sequentially at 8-minute intervals to achieve 1.0 to 1.5 mm Hg increments in pulmonary artery pressure. Lung weight gain, airway pressure, pulmonary artery pressure, and left atrial pressure were measured continuously. The slope of steady-state lung weight gain was used to determine Kf (g • min-1 • cm H2O-1 • 100 g-1 wet weight).

Results. Twenty-four–hour lung preservation at both 1° and 10°C increased Kf. A similar increase in Kf was observed in lungs stored at 1°C while inflated with 100% O2. However, a significant increase in Kf was observed when lungs inflated with 100% O2 were stored at 10°C. This increase in Kf was ameliorated by dimethylthiourea. Thiobarbituric acid–reactive substance levels were increased in lungs stored at 10°C while inflated with 100% O2. This finding was eliminated by dimethylthiourea.

Conclusions. These results indicate that free radical injury occurs during the ischemic phase when lungs are stored at moderate hypothermia while inflated with 100% O2.




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