The purpose of this study is to conduct a randomized controlled trial to evaluate the effect of preoperative budesonide inhalation on arterial blood oxygenation and intrapulmonary shunt in patients received one-lung ventilation

Population:

The target population comprises all adult aged 45-65 years who was diagnosed lung cancer and to receive video-assist thoracoscopic lobectomy under general anethesia.The study sample will include 50 subjects of both gender and any race or ethnicity.

Procedures:

Eligible and consented patients will be enrolled into the study if all eligibility criteria are met and will be randomly allocated to one of the two study arms:Budesonide inhalation group vs Normal saline inhalation group

Study Duration:

Overall duration of the study is 10 months.

Inclusion Criteria:

• Aged 45 yr to 65 yr ,height 155-176cm,weight 45-75kg,body mass index(BMI)18-27kg/m2,ASA Physical Status Classifications I to II,left-lateral position during OLV ,normal cardiac and pulmonary function ,and no cardiac,hepatic,renal and endocrine diseases.Diagnosed with uncomplicated lung cancer and was to receive video-assist thoracoscopic lobectomy under general anesthesia.

Exclusion Criteria:

• FEV1/FVC<70%,asthma,chronic obstructive pulmonary disease,acute lung infection,past history of thoracic surgery. preoperative glucocorticoid medication,preoperative chemotherapy,SpO2 kept below 90% for more than 15 minutes during operation,blood transfusion during operation,OLV less than an hour,occurrence of severe complications like allergic shock.

One research assistant was tasked to give the interventional medication in indentical containers to the anesthesiologists(care provider) in charge of the participants for preoperative preparations.Both the participants and care providers were blinded.