Postoperative lung injury and oxidative damage in patients undergoing pulmonary resection

Postpneumonectomy pulmonary oedema (PPO) complicates a significant number of thoracic surgical procedures involving lung resection and in its extreme form is indistinguishable from the acute respiratory distress syndrome. This study investigated the possibility that ischaemia-reperfusion (I-R) injury contributes to PPO via the production of damaging reactive oxygen species. In a prospective, observational, comparative study, patients undergoing pneumonectomy, lobectomy, or wedge resection or open lung biopsy were investigated for perioperative changes in lung function indicative of lung injury and changes in plasma indices of oxidative damage. Significant percentage perioperative falls in plasma protein thiol levels (-17.9+/-7.0% for pneumonectomy, -24.3+/-5.5% for two-lobe lobectomy and -10.2+/-2.2% for one-lobe lobectomy, p<0.05) and rises in plasma protein carbonyl levels (26.2+/-10.5% for pneumonectomy, p<0.05, 9.8+/-7.0% for two-lobe lobectomy and 5.0+/-2.7% for one-lobe lobectomy) were identified, but not in patients undergoing biopsy or wedge resection. Plasma myeloperoxidase levels rose in all groups, but not significantly. The carbon monoxide transfer coefficient (K(CO)) fell significantly in patients undergoing lobectomy (p<0.05) but not in those undergoing wedge resection, lung biopsy or pneumonectomy. Changes in markers of oxidative protein damage occurred in patients undergoing lung resection, although the gas transfer coefficient fell significantly only following lobectomy. Oxidative damage occurs during pulmonary resection, although associated effects on gas exchange are seen only after lobectomy.

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