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Eur J Cardiothorac Surg 2005;27:379-383
© 2005 Elsevier Science NL
a University of Athens Medical School, First Propaedeutic Surgical Department, Athens, Greece
b First Thoracic Surgical Department, ‘SOTIRIA’ General Hospital for Chest Diseases, 7 P. Dimitrakopoulou Street, 11141 Athens, Greece
Received 5 September 2004; received in revised form 13 December 2004; accepted 17 December 2004.
* Corresponding author. Tel./fax: +30 210 252 9048. (E-mail: pamnisthos{at}yahoo.gr).
Objective: The authors conducted a prospective analysis in order to investigate through lipid peroxidation metabolites the generation of oxygen free radicals after one-lung ventilation (OLV). Methods: From 2001 to 2003, 212 patients were prospectively studied for lung reexpansion/reperfusion injury. They were classified in six groups. Group A, non-OLV lobectomy group; B, OLV pneumonectomy group; C–E, OLV lobectomy of 60, 90, and 120min duration, respectively; F, normal subjects as baseline group. Preoperative, intraoperative and postoperative strict blood sampling protocol was followed. Malondialdehyde (MDA) plasma levels were measured. The recorded values were analyzed and statistically compared between groups and within each one. Results: Comparison of groups C–E (OLV) to all other documented significant (P<0.001) increase of MDA levels during lung reexpansion and for the following 12h. The magnitude of oxidative stress was related to OLV duration (group E>D>C, all P<0.001). The removal of cancer-associated parenchyma led to MDA level decrease postoperatively (P<0.001) especially after pneumonectomy (A vs. B, P<0.001). Conclusions: (1) Lung reexpansion provoked severe oxidative stress. (2) The degree of the amount of generated oxygen free radicals was associated to the duration of OLV. (3) Patients with lung cancer had a higher production of oxygen free radicals than normal population. (4)Tumor resection removes a large oxidative burden from the organism. (5) Mechanical ventilation and surgical trauma are weak free radical generators. (6) Manipulated lung tissue is also a source of oxygen free radicals, not only intraoperatively but also for several hours later.
Key Words: Oxidative stress • Lung reexpansion • Lung reperfusion
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