The Effects of Dexmedetomidine on Inflammatory Mediators After One Lung Ventilation During Video-assisted Thoracoscopic Surgery
The Effects of Dexmedetomidine on Inflammatory Mediators After One Lung Ventilation During Video-assisted Thoracoscopic Surgery
During lung surgery, mechanical one-lung ventilation is usually mandatory to provide
 appropriate surgical condition. However, not only mechanical ventilation is associated with
 inflammatory response, but also one lung ventilation will result in detrimental effects such
 as ischemia and reperfusion injury, and systemic inflammatory responses.

 Dexmedetomidine is an alpha-2 selective agonist. It was reported that dexmedetomidine
 decreased reperfusion injury, reduce the release of proinflammatory mediator and protected
 lungs from reperfusion injury in esophageal cancer patients who undergoing one lung
 ventilation from reducing oxidative stress metabolites. However, other details of protective
 effects is still unknown.

 High mobility group box 1 (HMGB1) is an important proinflammatory factor. It was found to be
 related to ventilator induced lung injury in several condition. Animal studies also showed
 that dexmedetomidine reduces the expression of messenger ribonucleic acid in
 lipopolysaccharide-activated macrophage so that decrease the amount of HMGB1 release.
 However, clinical trials about these are still lacking.

 In this study, we will investigate the protective effects of dexmedetomidine to patients
 undergoing video-assisted thoracoscopic surgery, especially on the specific inflammatory
 markers- plasma HMGB1 and other inflammatory cytokines (eg. interleukin-1. interleukin-6).
 This will let us to know the role of HMGB1 during one-lung ventilation injury and the effect
 of dexmedetomidine in regulating the release of HMGB1. This study will become a basis of
 further medical therapy in treating inflammation.
Inclusion Criteria:

 1. American Society of Anesthesiologists physical classification I-II patients who
 receive VATS lobectomy

 2. Patients with the following will be excluded:

 -  suspect of infection, eg. white blood cell count> 10000 ; fever> 38.3℃

 -  preoperative cardiac or renal dysfunction, eg. New York Heart Association >= II,
 estimated glomerular filtration rate< 60

 -  predisposing liver dysfunction, eg. aspartate aminotransferase or alanine
 aminotransferase >100; total bilirubin> 2mg/dl; >= Child B liver cirrhosis