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Ann Thorac Surg 1996;61:969-972
© 1996 The Society of Thoracic Surgeons
Thoracic Oncology Laboratory, Memorial Sloan-Kettering Cancer Center, New York, New York
Accepted for publication November 3, 1995.
Background. For patients with malignant neoplasms metastatic to lung, systemic chemotherapy in doses high enough to achieve significant survival improvement is often limited by host toxicity. Isolated single-lung perfusion offers the advantage of delivering high-dose organ-specific chemotherapy while minimizing systemic toxicity. We compared the cardiac and systemic toxicities associated with intravenous administration versus isolated single-lung perfusion with doxorubicin.
Methods. Thirty-three male Fischer 344 rats weighing 275 to 300 g were randomized into three groups: normal control rats (n = 11), intravenous doxorubicin (7 mg/kg) (n = 11), and isolated left lung perfusion with 320 µg doxorubicin/mL (n = 11). Animals undergoing isolated single-lung perfusion were anesthetized with pentobarbital, intubated, and ventilated, and then had left thoracotomy with cannulation of the pulmonary artery and a pulmonary venotomy; pulmonary artery and vein were clamped proximally. Animals were perfused for 10 minutes at a rate of 0.5 mL/min, followed by a 5 minute rinse with buffered hespan solution. Arteriotomy and venotomy were repaired and circulation was restored. Daily weights were recorded. On day 24, cardiac output was determined in all groups by injection of radiolabeled chromium 51 microspheres.
Results. Animals treated with 7 mg/kg intravenous doxorubicin had a significant weight loss as compared with those treated with isolated lung perfusion (209.2 ± 29.9 g versus 302.3 ± 10.1 g; p < 0.01). Animals treated with isolated single-lung perfusion, after recovering from surgical stress, resumed normal growth pattern. Significant cardiac toxicities were seen in intravenously treated animals; cardiac index (27.4 ± 6.9 versus 39.4 +/6.3 mL•min-1•100 g body weight-1) and heart weights (0.56 ± 0.04 versus 0.88 ± 0.09 g) were reduced in the intravenously treated group as compared with the group treated with isolated single-lung perfusion. In addition, severe hematologic toxicities are associated with intravenous doxorubicin administration.
Conclusions. Intravenous administration of doxorubicin is associated with severe host toxicities, which include weight loss, decreased cardiac function, and hematologic toxicity. Isolated lung perfusion with high-dose doxorubicin is well tolerated and is associated with minimal host toxicity.
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