Doppler Ultrasonography Assessed Vascular Changes Before and After Radial Artery Puncture

Doppler Ultrasonography Assessed Vascular Changes Before and After Radial Artery Puncture

The investigators designed a study to assess whether there were any blood flow indexes change before and after radial artery puncture with doppler ultrasonography

The investigators designed a study to assess whether there were any blood flow indexes change before and after radial artery puncture with doppler ultrasonography.The indexes include Arterial Diameter,Peak Systolic Velocity,End Diastolic Velocity,Resistive Index,Pulsatility Index,Systolic/End Diastolic Ratio,Time AverageMean Velocity and Blood Flow.

Inclusion Criteria:

• Patients were included in the study if they were ethnic Chinese, between 18 and 65 years old, American Society of Anesthesiologists (ASA) physical status I or II,candidates for general anesthesia undergoing thoracic surgery

Exclusion Criteria:

• Patients were excluded if they do not want to cooperate with the test, had a history of upper extremity arteriosclerosis obliterans or thromboangitis obliterans,had a history of radial artery puncture or coronary artery bypass grafting,had acute vessel trauma,or had been diagnosed with Raynaud' disease,had suffered from mental or neurological disorders