Thoracic Paravertebral Blocks Using a Combination of Ropivacaine and Dexmedetomidine

Thoracic Paravertebral Blocks Using a Combination of Ropivacaine and Dexmedetomidine

The investigators designed a study to assess whether thoracic paravertebral blocks using a combination of ropivacaine and dexmedetomidine prolong nerve block duration.

The investigators designed a study to assess whether thoracic paravertebral blocks using a combination of ropivacaine and dexmedetomidine prolong nerve block duration. The effects of dexmedetomidine have only been compared at lower doses. This trial examined the effect of greater dose of dexmedetomidine on thoracic paravertebral block analgesia duration.

Inclusion Criteria:

• Patients were included in the study if they were ethnic Chinese,
• 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 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