The Effects of Dexmedetomidine on Inflammatory Mediators After One Lung Ventilation During Video-assisted Thoracoscopic Surgery

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National Taiwan University

Status and phase

Phase 4


One Lung Ventilation in Thoracic Surgery


Drug: Placebo control
Drug: Dexmedetomidine

Study type


Funder types




Details and patient eligibility


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.


60 patients




20 to 75 years old


No Healthy Volunteers

Inclusion and exclusion criteria

Inclusion Criteria:

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

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

Trial design

60 participants in 2 patient groups, including a placebo group

Dexmedetomidine group
Experimental group
Drug: Dexmedetomidine
Normal saline group
Placebo Comparator group
Drug: Placebo control

Trial contacts and locations



Data sourced from

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