Application of dexmedetomidine for lung injury in elderly patients undergoing one-lung ventilation

INTRODUCTION: This study aimed to evaluate the effects of dexmedetomidine (DEX) on lung injury, the oxygenation index and perioperative pulmonary complications in elderly patients who underwent thoracotomy with one-lung ventilation (OLV). MATERIAL AND METHODS: A total of 120 elderly patients with lung cancer were included in the present study. According to the random number table method, these patients were randomly divided into two groups: group D and group C. Patients in group D were intravenously pumped with 0.5 μg/kg/h of DEX before anesthesia. The infusion was completed within 15 min, and anesthesia was induced by venous injection. Patients in group C were pumped with equal volumes of normal saline. RESULTS: At T(2) and T(3), compared with group C, group D had a significant decrease in cardiac index, mean arterial pressure and central venous pressure (p < 0.05). At T(2), T(3) and T(4), compared with group C, group D had a significant increase in pH and PaO(2) (p < 0.05). At T(2), T(3) and T(4), compared with group C, group D had a significant decrease in Qs/Qt (p < 0.05). At T(6), compared with group C, group D had a significant decrease in the supernatant of bronchoalveolar lavage fluid of tumor necrosis factor-α and interleukin 6 (p < 0.05). At T(5), compared with group C, group D had a significant decrease in Visual Analogue Scale score (p < 0.05), and a significant increase in Ramsay Sedation Scale score (p < 0.05), and the number of respiratory and cardiovascular events also decreased (p < 0.05). CONCLUSIONS: In elderly patients, dexmedetomidine can reduce Qs/Qt and increase PaO(2) during OLV in surgery. It can reduce lung injury. Moreover, DEX reduced respiratory and cardiovascular complications in the perioperative period.